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src="https://img.shields.io/static/v1?label=release&message=v2.3.1&color=blue&style=for-the-badge" alt="Release" class="img_ev3q"> </a> <a href="https://cloud-native.slack.com/archives/C0344AANLA1" target="_blank" rel="noopener noreferrer"><img decoding="async" loading="lazy" src="https://img.shields.io/badge/slack-%40cncf%2Fopenfeature-brightgreen?style=flat&logo=slack" alt="Slack" class="img_ev3q"></a> <a href="https://codecov.io/gh/open-feature/dotnet-sdk" target="_blank" rel="noopener noreferrer"><img decoding="async" loading="lazy" src="https://codecov.io/gh/open-feature/dotnet-sdk/branch/main/graph/badge.svg?token=MONAVJBXUJ" alt="Codecov" class="img_ev3q"></a> <a href="https://www.nuget.org/packages/OpenFeature" target="_blank" rel="noopener noreferrer"><img decoding="async" loading="lazy" src="https://img.shields.io/nuget/vpre/OpenFeature" alt="NuGet" class="img_ev3q"></a> <a href="https://www.bestpractices.dev/en/projects/6250" target="_blank" rel="noopener noreferrer"><img decoding="async" loading="lazy" src="https://bestpractices.coreinfrastructure.org/projects/6250/badge" alt="CII Best Practices" class="img_ev3q"></a> <h2 class="anchor anchorWithStickyNavbar_LWe7" id="quick-start">Quick start<a href="#quick-start" class="hash-link" aria-label="Direct link to Quick start" title="Direct link to Quick start"></a></h2> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="requirements">Requirements<a href="#requirements" class="hash-link" aria-label="Direct link to Requirements" title="Direct link to Requirements"></a></h3> <ul> <li>.NET 8+</li> <li>.NET Framework 4.6.2+</li> </ul> Note that the packages will aim to support all current .NET versions. Refer to the currently supported versions <a href="https://dotnet.microsoft.com/download/dotnet" target="_blank" rel="noopener noreferrer">.NET</a> and <a href="https://dotnet.microsoft.com/download/dotnet-framework" target="_blank" rel="noopener noreferrer">.NET Framework</a> excluding .NET Framework 3.5 <h3 class="anchor anchorWithStickyNavbar_LWe7" id="install">Install<a href="#install" class="hash-link" aria-label="Direct link to Install" title="Direct link to Install"></a></h3> Use the following to initialize your project: <div class="language-sh codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sh codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">dotnet new console </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> and install OpenFeature: <div class="language-sh codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sh codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">dotnet add package OpenFeature </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="usage">Usage<a href="#usage" class="hash-link" aria-label="Direct link to Usage" title="Direct link to Usage"></a></h3> <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">public async Task Example() { // Register your feature flag provider await Api.Instance.SetProviderAsync(new InMemoryProvider()); // Create a new client FeatureClient client = Api.Instance.GetClient(); // Evaluate your feature flag bool v2Enabled = await client.GetBooleanValueAsync("v2_enabled", false); if ( v2Enabled ) { //Do some work } } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h2 class="anchor anchorWithStickyNavbar_LWe7" id="features">Features<a href="#features" class="hash-link" aria-label="Direct link to Features" title="Direct link to Features"></a></h2> <table><thead><tr><th>Status</th><th>Features</th><th>Description</th></tr></thead><tbody><tr><td>✅</td><td><a href="#providers">Providers</a></td><td>Integrate with a commercial, open source, or in-house feature management tool.</td></tr><tr><td>✅</td><td><a href="#targeting">Targeting</a></td><td>Contextually-aware flag evaluation using <a href="/docs/reference/concepts/evaluation-context">evaluation context</a>.</td></tr><tr><td>✅</td><td><a href="#hooks">Hooks</a></td><td>Add functionality to various stages of the flag evaluation life-cycle.</td></tr><tr><td>✅</td><td><a href="#tracking">Tracking</a></td><td>Associate user actions with feature flag evaluations.</td></tr><tr><td>✅</td><td><a href="#logging">Logging</a></td><td>Integrate with popular logging packages.</td></tr><tr><td>✅</td><td><a href="#domains">Domains</a></td><td>Logically bind clients with providers.</td></tr><tr><td>✅</td><td><a href="#eventing">Eventing</a></td><td>React to state changes in the provider or flag management system.</td></tr><tr><td>✅</td><td><a href="#shutdown">Shutdown</a></td><td>Gracefully clean up a provider during application shutdown.</td></tr><tr><td>✅</td><td><a href="#transaction-context-propagation">Transaction Context Propagation</a></td><td>Set a specific <a href="/docs/reference/concepts/evaluation-context">evaluation context</a> for a transaction (e.g. an HTTP request or a thread).</td></tr><tr><td>✅</td><td><a href="#extending">Extending</a></td><td>Extend OpenFeature with custom providers and hooks.</td></tr><tr><td>🔬</td><td><a href="#DependencyInjection">DependencyInjection</a></td><td>Integrate OpenFeature with .NET's dependency injection for streamlined provider setup.</td></tr></tbody></table> <blockquote> Implemented: ✅ | In-progress: ⚠️ | Not implemented yet: ❌ | Experimental: 🔬 </blockquote> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="providers">Providers<a href="#providers" class="hash-link" aria-label="Direct link to Providers" title="Direct link to Providers"></a></h3> <a href="/docs/reference/concepts/provider">Providers</a> are an abstraction between a flag management system and the OpenFeature SDK. Here is <a href="/ecosystem?instant_search%5BrefinementList%5D%5Btype%5D%5B0%5D=Provider&instant_search%5BrefinementList%5D%5Btechnology%5D%5B0%5D=.NET">a complete list of available providers</a>. If the provider you're looking for hasn't been created yet, see the <a href="#develop-a-provider">develop a provider</a> section to learn how to build it yourself. Once you've added a provider as a dependency, it can be registered with OpenFeature like this: <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">await Api.Instance.SetProviderAsync(new MyProvider()); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> In some situations, it may be beneficial to register multiple providers in the same application. This is possible using <a href="#domains">domains</a>, which is covered in more detail below. <h3 class="anchor anchorWithStickyNavbar_LWe7" id="targeting">Targeting<a href="#targeting" class="hash-link" aria-label="Direct link to Targeting" title="Direct link to Targeting"></a></h3> Sometimes, the value of a flag must consider some dynamic criteria about the application or user such as the user's location, IP, email address, or the server's location. In OpenFeature, we refer to this as <a href="/specification/glossary#targeting">targeting</a>. If the flag management system you're using supports targeting, you can provide the input data using the <a href="/docs/reference/concepts/evaluation-context">evaluation context</a>. <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// set a value to the global context EvaluationContextBuilder builder = EvaluationContext.Builder(); builder.Set("region", "us-east-1"); EvaluationContext apiCtx = builder.Build(); Api.Instance.SetContext(apiCtx); // set a value to the client context builder = EvaluationContext.Builder(); builder.Set("region", "us-east-1"); EvaluationContext clientCtx = builder.Build(); var client = Api.Instance.GetClient(); client.SetContext(clientCtx); // set a value to the invocation context builder = EvaluationContext.Builder(); builder.Set("region", "us-east-1"); EvaluationContext reqCtx = builder.Build(); bool flagValue = await client.GetBooleanValuAsync("some-flag", false, reqCtx); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="hooks">Hooks<a href="#hooks" class="hash-link" aria-label="Direct link to Hooks" title="Direct link to Hooks"></a></h3> <a href="/docs/reference/concepts/hooks">Hooks</a> allow for custom logic to be added at well-defined points of the flag evaluation life-cycle. Look <a href="/ecosystem/?instant_search%5BrefinementList%5D%5Btype%5D%5B0%5D=Hook&instant_search%5BrefinementList%5D%5Bcategory%5D%5B0%5D=Server-side&instant_search%5BrefinementList%5D%5Btechnology%5D%5B0%5D=.NET">here</a> for a complete list of available hooks. If the hook you're looking for hasn't been created yet, see the <a href="#develop-a-hook">develop a hook</a> section to learn how to build it yourself. Once you've added a hook as a dependency, it can be registered at the global, client, or flag invocation level. <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// add a hook globally, to run on all evaluations Api.Instance.AddHooks(new ExampleGlobalHook()); // add a hook on this client, to run on all evaluations made by this client var client = Api.Instance.GetClient(); client.AddHooks(new ExampleClientHook()); // add a hook for this evaluation only var value = await client.GetBooleanValueAsync("boolFlag", false, context, new FlagEvaluationOptions(new ExampleInvocationHook())); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="logging">Logging<a href="#logging" class="hash-link" aria-label="Direct link to Logging" title="Direct link to Logging"></a></h3> The .NET SDK uses Microsoft.Extensions.Logging. See the <a href="https://learn.microsoft.com/en-us/dotnet/core/extensions/logging?tabs=command-line" target="_blank" rel="noopener noreferrer">manual</a> for complete documentation. <h4 class="anchor anchorWithStickyNavbar_LWe7" id="logging-hook">Logging Hook<a href="#logging-hook" class="hash-link" aria-label="Direct link to Logging Hook" title="Direct link to Logging Hook"></a></h4> The .NET SDK includes a LoggingHook, which logs detailed information at key points during flag evaluation, using Microsoft.Extensions.Logging structured logging API. This hook can be particularly helpful for troubleshooting and debugging; simply attach it at the global, client or invocation level and ensure your log level is set to "debug". <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">using var loggerFactory = LoggerFactory.Create(builder => builder.AddConsole()); var logger = loggerFactory.CreateLogger("Program"); var client = Api.Instance.GetClient(); client.AddHooks(new LoggingHook(logger)); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> See <a href="#hooks">hooks</a> for more information on configuring hooks. <h3 class="anchor anchorWithStickyNavbar_LWe7" id="domains">Domains<a href="#domains" class="hash-link" aria-label="Direct link to Domains" title="Direct link to Domains"></a></h3> Clients can be assigned to a domain. A domain is a logical identifier which can be used to associate clients with a particular provider. If a domain has no associated provider, the default provider is used. <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// registering the default provider await Api.Instance.SetProviderAsync(new LocalProvider()); // registering a provider to a domain await Api.Instance.SetProviderAsync("clientForCache", new CachedProvider()); // a client backed by default provider FeatureClient clientDefault = Api.Instance.GetClient(); // a client backed by CachedProvider FeatureClient scopedClient = Api.Instance.GetClient("clientForCache"); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> Domains can be defined on a provider during registration. For more details, please refer to the <a href="#providers">providers</a> section. <h3 class="anchor anchorWithStickyNavbar_LWe7" id="eventing">Eventing<a href="#eventing" class="hash-link" aria-label="Direct link to Eventing" title="Direct link to Eventing"></a></h3> Events allow you to react to state changes in the provider or underlying flag management system, such as flag definition changes, provider readiness, or error conditions. Initialization events (<code>PROVIDER_READY</code> on success, <code>PROVIDER_ERROR</code> on failure) are dispatched for every provider. Some providers support additional events, such as <code>PROVIDER_CONFIGURATION_CHANGED</code>. Please refer to the documentation of the provider you're using to see what events are supported. Example usage of an Event handler: <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">public static void EventHandler(ProviderEventPayload eventDetails) { Console.WriteLine(eventDetails.Type); } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">EventHandlerDelegate callback = EventHandler; // add an implementation of the EventHandlerDelegate for the PROVIDER_READY event Api.Instance.AddHandler(ProviderEventTypes.ProviderReady, callback); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> It is also possible to register an event handler for a specific client, as in the following example: <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">EventHandlerDelegate callback = EventHandler; var myClient = Api.Instance.GetClient("my-client"); var provider = new ExampleProvider(); await Api.Instance.SetProviderAsync(myClient.GetMetadata().Name, provider); myClient.AddHandler(ProviderEventTypes.ProviderReady, callback); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="tracking">Tracking<a href="#tracking" class="hash-link" aria-label="Direct link to Tracking" title="Direct link to Tracking"></a></h3> The <a href="/specification/sections/tracking">tracking API</a> allows you to use OpenFeature abstractions and objects to associate user actions with feature flag evaluations. This is essential for robust experimentation powered by feature flags. For example, a flag enhancing the appearance of a UI component might drive user engagement to a new feature; to test this hypothesis, telemetry collected by a hook(#hooks) or provider(#providers) can be associated with telemetry reported in the client's <code>track</code> function. <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">var client = Api.Instance.GetClient(); client.Track("visited-promo-page", trackingEventDetails: new TrackingEventDetailsBuilder().SetValue(99.77).Set("currency", "USD").Build()); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> Note that some providers may not support tracking; check the documentation for your provider for more information. <h3 class="anchor anchorWithStickyNavbar_LWe7" id="shutdown">Shutdown<a href="#shutdown" class="hash-link" aria-label="Direct link to Shutdown" title="Direct link to Shutdown"></a></h3> The OpenFeature API provides a close function to perform a cleanup of all registered providers. This should only be called when your application is in the process of shutting down. <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// Shut down all providers await Api.Instance.ShutdownAsync(); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="transaction-context-propagation">Transaction Context Propagation<a href="#transaction-context-propagation" class="hash-link" aria-label="Direct link to Transaction Context Propagation" title="Direct link to Transaction Context Propagation"></a></h3> Transaction context is a container for transaction-specific evaluation context (e.g. user id, user agent, IP). Transaction context can be set where specific data is available (e.g. an auth service or request handler) and by using the transaction context propagator it will automatically be applied to all flag evaluations within a transaction (e.g. a request or thread). By default, the <code>NoOpTransactionContextPropagator</code> is used, which doesn't store anything. To register a <a href="https://learn.microsoft.com/en-us/dotnet/api/system.threading.asynclocal-1" target="_blank" rel="noopener noreferrer">AsyncLocal</a> context propagator, you can use the <code>SetTransactionContextPropagator</code> method as shown below. <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// registering the AsyncLocalTransactionContextPropagator Api.Instance.SetTransactionContextPropagator(new AsyncLocalTransactionContextPropagator()); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> Once you've registered a transaction context propagator, you can propagate the data into request-scoped transaction context. <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// adding userId to transaction context EvaluationContext transactionContext = EvaluationContext.Builder() .Set("userId", userId) .Build(); Api.Instance.SetTransactionContext(transactionContext); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> Additionally, you can develop a custom transaction context propagator by implementing the <code>TransactionContextPropagator</code> interface and registering it as shown above. <h2 class="anchor anchorWithStickyNavbar_LWe7" id="extending">Extending<a href="#extending" class="hash-link" aria-label="Direct link to Extending" title="Direct link to Extending"></a></h2> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="develop-a-provider">Develop a provider<a href="#develop-a-provider" class="hash-link" aria-label="Direct link to Develop a provider" title="Direct link to Develop a provider"></a></h3> To develop a provider, you need to create a new project and include the OpenFeature SDK as a dependency. This can be a new repository or included in <a href="https://github.com/open-feature/dotnet-sdk-contrib" target="_blank" rel="noopener noreferrer">the existing contrib repository</a> available under the OpenFeature organization. You’ll then need to write the provider by implementing the <code>FeatureProvider</code> interface exported by the OpenFeature SDK. <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">public class MyProvider : FeatureProvider { public override Metadata GetMetadata() { return new Metadata("My Provider"); } public override Task<ResolutionDetails<bool>> ResolveBooleanValueAsync(string flagKey, bool defaultValue, EvaluationContext? context = null, CancellationToken cancellationToken = default) { // resolve a boolean flag value } public override Task<ResolutionDetails<string>> ResolveStringValueAsync(string flagKey, string defaultValue, EvaluationContext? context = null, CancellationToken cancellationToken = default) { // resolve a string flag value } public override Task<ResolutionDetails<int>> ResolveIntegerValueAsync(string flagKey, int defaultValue, EvaluationContext context = null) { // resolve an int flag value } public override Task<ResolutionDetails<double>> ResolveDoubleValueAsync(string flagKey, double defaultValue, EvaluationContext? context = null, CancellationToken cancellationToken = default) { // resolve a double flag value } public override Task<ResolutionDetails<Value>> ResolveStructureValueAsync(string flagKey, Value defaultValue, EvaluationContext? context = null, CancellationToken cancellationToken = default) { // resolve an object flag value } } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="develop-a-hook">Develop a hook<a href="#develop-a-hook" class="hash-link" aria-label="Direct link to Develop a hook" title="Direct link to Develop a hook"></a></h3> To develop a hook, you need to create a new project and include the OpenFeature SDK as a dependency. This can be a new repository or included in <a href="https://github.com/open-feature/dotnet-sdk-contrib" target="_blank" rel="noopener noreferrer">the existing contrib repository</a> available under the OpenFeature organization. Implement your own hook by conforming to the <code>Hook interface</code>. To satisfy the interface, all methods (<code>Before</code>/<code>After</code>/<code>Finally</code>/<code>Error</code>) need to be defined. <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">public class MyHook : Hook { public ValueTask<EvaluationContext> BeforeAsync<T>(HookContext<T> context, IReadOnlyDictionary<string, object> hints = null) { // code to run before flag evaluation } public ValueTask AfterAsync<T>(HookContext<T> context, FlagEvaluationDetails<T> details, IReadOnlyDictionary<string, object> hints = null) { // code to run after successful flag evaluation } public ValueTask ErrorAsync<T>(HookContext<T> context, Exception error, IReadOnlyDictionary<string, object> hints = null) { // code to run if there's an error during before hooks or during flag evaluation } public ValueTask FinallyAsync<T>(HookContext<T> context, FlagEvaluationDetails<T> evaluationDetails, IReadOnlyDictionary<string, object> hints = null) { // code to run after all other stages, regardless of success/failure } } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> Built a new hook? <a href="https://github.com/open-feature/openfeature.dev/issues/new?assignees=&labels=hook&projects=&template=document-hook.yaml&title=%5BHook%5D%3A+" target="_blank" rel="noopener noreferrer">Let us know</a> so we can add it to the docs! <h3 class="anchor anchorWithStickyNavbar_LWe7" id="dependencyinjection">DependencyInjection<a href="#dependencyinjection" class="hash-link" aria-label="Direct link to DependencyInjection" title="Direct link to DependencyInjection"></a></h3> <div class="markdown-alert markdown-alert-note"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" viewBox="0 0 16 16"><path d="M8 15A7 7 0 1 1 8 1a7 7 0 0 1 0 14m0 1A8 8 0 1 0 8 0a8 8 0 0 0 0 16"></path><path d="m8.93 6.588-2.29.287-.082.38.45.083c.294.07.352.176.288.469l-.738 3.468c-.194.897.105 1.319.808 1.319.545 0 1.178-.252 1.465-.598l.088-.416c-.2.176-.492.246-.686.246-.275 0-.375-.193-.304-.533zM9 4.5a1 1 0 1 1-2 0 1 1 0 0 1 2 0"></path></svg>Note The OpenFeature.DependencyInjection and OpenFeature.Hosting packages are currently experimental. They streamline the integration of OpenFeature within .NET applications, allowing for seamless configuration and lifecycle management of feature flag providers using dependency injection and hosting services. </div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="installation">Installation<a href="#installation" class="hash-link" aria-label="Direct link to Installation" title="Direct link to Installation"></a></h4> To set up dependency injection and hosting capabilities for OpenFeature, install the following packages: <div class="language-sh codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sh codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">dotnet add package OpenFeature.DependencyInjection dotnet add package OpenFeature.Hosting </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="usage-examples">Usage Examples<a href="#usage-examples" class="hash-link" aria-label="Direct link to Usage Examples" title="Direct link to Usage Examples"></a></h4> For a basic configuration, you can use the InMemoryProvider. This provider is simple and well-suited for development and testing purposes. Basic Configuration: <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">builder.Services.AddOpenFeature(featureBuilder => { featureBuilder .AddHostedFeatureLifecycle() // From Hosting package .AddContext((contextBuilder, serviceProvider) => { /* Custom context configuration */ }) .AddInMemoryProvider(); }); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> Domain-Scoped Provider Configuration: To set up multiple providers with a selection policy, define logic for choosing the default provider. This example designates <code>name1</code> as the default provider: <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">builder.Services.AddOpenFeature(featureBuilder => { featureBuilder .AddHostedFeatureLifecycle() .AddContext((contextBuilder, serviceProvider) => { /* Custom context configuration */ }) .AddInMemoryProvider("name1") .AddInMemoryProvider("name2") .AddPolicyName(options => { // Custom logic to select a default provider options.DefaultNameSelector = serviceProvider => "name1"; }); }); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="registering-a-custom-provider">Registering a Custom Provider<a href="#registering-a-custom-provider" class="hash-link" aria-label="Direct link to Registering a Custom Provider" title="Direct link to Registering a Custom Provider"></a></h3> You can register a custom provider, such as <code>InMemoryProvider</code>, with OpenFeature using the <code>AddProvider</code> method. This approach allows you to dynamically resolve services or configurations during registration. <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">services.AddOpenFeature(builder => { builder.AddProvider(provider => { // Resolve services or configurations as needed var variants = new Dictionary<string, bool> { { "on", true } }; var flags = new Dictionary<string, Flag> { { "feature-key", new Flag<bool>(variants, "on") } }; // Register a custom provider, such as InMemoryProvider return new InMemoryProvider(flags); }); }); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="adding-a-domain-scoped-provider">Adding a Domain-Scoped Provider<a href="#adding-a-domain-scoped-provider" class="hash-link" aria-label="Direct link to Adding a Domain-Scoped Provider" title="Direct link to Adding a Domain-Scoped Provider"></a></h4> You can also register a domain-scoped custom provider, enabling configurations specific to each domain: <div class="language-csharp codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-csharp codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">services.AddOpenFeature(builder => { builder.AddProvider("my-domain", (provider, domain) => { // Resolve services or configurations as needed for the domain var variants = new Dictionary<string, bool> { { "on", true } }; var flags = new Dictionary<string, Flag> { { $"{domain}-feature-key", new Flag<bool>(variants, "on") } }; // Register a domain-scoped custom provider such as InMemoryProvider return new InMemoryProvider(flags); }); }); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" 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class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Server</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/reference/technologies/server/go"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Go</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#quick-start" class="table-of-contents__link toc-highlight">Quick start</a><ul><li><a href="#requirements" class="table-of-contents__link toc-highlight">Requirements</a></li><li><a href="#install" class="table-of-contents__link toc-highlight">Install</a></li><li><a href="#usage" class="table-of-contents__link toc-highlight">Usage</a></li></ul></li><li><a href="#features" class="table-of-contents__link toc-highlight">Features</a><ul><li><a href="#providers" class="table-of-contents__link 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