Some Common Operations using List<string> - Part II

<!DOCTYPE html> <html lang="en"> <head id="ctl00_Head1"><meta charset="utf-8" /><title> Some Common Operations using List<string> - Part II | DotNetCurry </title><meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1" /><meta name="description" content="In Part I of this article, I shared some common operations on List<string>. 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In this article, I will share some advanced examples that demonstrate common operations on List<string> </div> <div class="socialshare"> <a class="resp-sharing-button__link" id="fbsharelinktop" target="_blank" aria-label=""> <div class="resp-sharing-button resp-sharing-button--facebook resp-sharing-button--small"><div aria-hidden="true" class="resp-sharing-button__icon resp-sharing-button__icon--solid"> <svg version="1.1" x="0px" y="0px" width="24px" height="24px" viewBox="0 0 24 24" enable-background="new 0 0 24 24" xml:space="preserve"> <g> <path d="M18.768,7.465H14.5V5.56c0-0.896,0.594-1.105,1.012-1.105s2.988,0,2.988,0V0.513L14.171,0.5C10.244,0.5,9.5,3.438,9.5,5.32 v2.145h-3v4h3c0,5.212,0,12,0,12h5c0,0,0-6.85,0-12h3.851L18.768,7.465z"/> </g> </svg> <span></span> </div> </div> </a> <a class="resp-sharing-button__link" id="twtsharelinktop" target="_blank" aria-label=""> <div class="resp-sharing-button resp-sharing-button--twitter resp-sharing-button--small"><div aria-hidden="true" class="resp-sharing-button__icon resp-sharing-button__icon--solid"> <svg version="1.1" x="0px" y="0px" width="24px" height="24px" viewBox="0 0 24 24" enable-background="new 0 0 24 24" xml:space="preserve"> <g> <path d="M23.444,4.834c-0.814,0.363-1.5,0.375-2.228,0.016c0.938-0.562,0.981-0.957,1.32-2.019c-0.878,0.521-1.851,0.9-2.886,1.104 C18.823,3.053,17.642,2.5,16.335,2.5c-2.51,0-4.544,2.036-4.544,4.544c0,0.356,0.04,0.703,0.117,1.036 C8.132,7.891,4.783,6.082,2.542,3.332C2.151,4.003,1.927,4.784,1.927,5.617c0,1.577,0.803,2.967,2.021,3.782 C3.203,9.375,2.503,9.171,1.891,8.831C1.89,8.85,1.89,8.868,1.89,8.888c0,2.202,1.566,4.038,3.646,4.456 c-0.666,0.181-1.368,0.209-2.053,0.079c0.579,1.804,2.257,3.118,4.245,3.155C5.783,18.102,3.372,18.737,1,18.459 C3.012,19.748,5.399,20.5,7.966,20.5c8.358,0,12.928-6.924,12.928-12.929c0-0.198-0.003-0.393-0.012-0.588 C21.769,6.343,22.835,5.746,23.444,4.834z"/> </g> </svg> <span></span> </div> </div> </a> <a class="resp-sharing-button__link" id="linkdinsharelinktop" target="_blank" aria-label=""> <div class="resp-sharing-button resp-sharing-button--linkedin resp-sharing-button--small"><div aria-hidden="true" class="resp-sharing-button__icon resp-sharing-button__icon--solid"> <svg xmlns="https://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M6.5 21.5h-5v-13h5v13zM4 6.5C2.5 6.5 1.5 5.3 1.5 4s1-2.4 2.5-2.4c1.6 0 2.5 1 2.6 2.5 0 1.4-1 2.5-2.6 2.5zm11.5 6c-1 0-2 1-2 2v7h-5v-13h5V10s1.6-1.5 4-1.5c3 0 5 2.2 5 6.3v6.7h-5v-7c0-1-1-2-2-2z"/></svg> <span></span> </div> </div> </a>  </div> </div> <div id="articleBody" class="col-md-12 row"> <div style="MARGIN: 24pt 0cm 0pt"><b><font size="6"><font color="#365f91" size="5" face="Cambria">Some Common Operations using List<string> - Part II</font></font></b></div> <div style="MARGIN: 0cm 0cm 10pt"> </div> <div style="MARGIN: 0cm 0cm 10pt" align="justify"><font size="2" face="Verdana">In Part I of this article, I shared some common operations on List<string>. You can read the article over here </font><a href="https://www.dotnetcurry.com/ShowArticle.aspx?ID=447"><font color="#800080" size="2" face="Verdana">Some Common Operations using List - Part I</font></a><font size="2" face="Verdana">. In this article, I will share some more examples that demonstrate common operations on List<string></font></div> <div style="MARGIN: 0cm 0cm 10pt" align="justify"><font size="2" face="Verdana">Here are the sample List<string> declarations for demonstration purposes. The VB.NET code has been converted using a conversion tool and has not been tested.</font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">C#</font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: #2b91af">List</span><span style="FONT-FAMILY: "Courier New""><<span style="COLOR: blue">string</span>> lstOne = <span style="COLOR: blue">new</span> <span style="COLOR: #2b91af">List</span><<span style="COLOR: blue">string</span>>() { <span style="COLOR: #a31515">"January"</span>, <span style="COLOR: #a31515">"February"</span>, <span style="COLOR: #a31515">"March"</span>};</span></font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: #2b91af">List</span><span style="FONT-FAMILY: "Courier New""><<span style="COLOR: blue">string</span>> lstTwo = <span style="COLOR: blue">new</span> <span style="COLOR: #2b91af">List</span><<span style="COLOR: blue">string</span>>() { <span style="COLOR: #a31515">"January"</span>, <span style="COLOR: #a31515">"April"</span>, <span style="COLOR: #a31515">"March"</span>};</span></font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: #2b91af">List</span><span style="FONT-FAMILY: "Courier New""><<span style="COLOR: blue">string</span>> lstThree = <span style="COLOR: blue">new</span> <span style="COLOR: #2b91af">List</span><<span style="COLOR: blue">string</span>>() { <span style="COLOR: #a31515">"January"</span>, <span style="COLOR: #a31515">"April"</span>, <span style="COLOR: #a31515">"March"</span>, <span style="COLOR: #a31515">"May"</span> };</span></font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: #2b91af">List</span><span style="FONT-FAMILY: "Courier New""><<span style="COLOR: blue">string</span>> lstFour = <span style="COLOR: blue">new</span> <span style="COLOR: #2b91af">List</span><<span style="COLOR: blue">string</span>>() { <span style="COLOR: #a31515">"Jan"</span>, <span style="COLOR: #a31515">"Feb"</span>, <span style="COLOR: #a31515">"Jan"</span>, <span style="COLOR: #a31515">"April"</span>, <span style="COLOR: #a31515">"Feb"</span> };</span></font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: #2b91af">IEnumerable</span><span style="FONT-FAMILY: "Courier New""><<span style="COLOR: blue">string</span>> lstNew = <span style="COLOR: blue">null</span>;</span></font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">VB.NET</font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">Dim</span><span style="FONT-FAMILY: "Courier New""> lstOne <span style="COLOR: blue">As</span> <span style="COLOR: blue">New</span> List(<span style="COLOR: blue">Of</span> <span style="COLOR: blue">String</span>) (<span style="COLOR: blue">New</span> <span style="COLOR: blue">String</span>() {"January", "February", "March"})</span></font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">Dim</span><span style="FONT-FAMILY: "Courier New""> lstTwo <span style="COLOR: blue">As</span> <span style="COLOR: blue">New</span> List(<span style="COLOR: blue">Of</span> <span style="COLOR: blue">String</span>) (<span style="COLOR: blue">New</span> <span style="COLOR: blue">String</span>() {"January", "April", "March"})</span></font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">Dim</span><span style="FONT-FAMILY: "Courier New""> lstThree <span style="COLOR: blue">As</span> <span style="COLOR: blue">New</span> List(<span style="COLOR: blue">Of</span> <span style="COLOR: blue">String</span>) (<span style="COLOR: blue">New</span> <span style="COLOR: blue">String</span>() {"January", "April", "March", "May"})</span></font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">Dim</span><span style="FONT-FAMILY: "Courier New""> lstFour <span style="COLOR: blue">As</span> <span style="COLOR: blue">New</span> List(<span style="COLOR: blue">Of</span> <span style="COLOR: blue">String</span>) (<span style="COLOR: blue">New</span> <span style="COLOR: blue">String</span>() {"Jan", "Feb", "Jan", "April", "Feb"})</span></font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">Dim</span><span style="FONT-FAMILY: "Courier New""> lstNew <span style="COLOR: blue">As</span> IEnumerable(<span style="COLOR: blue">Of</span> <span style="COLOR: blue">String</span>) = <span style="COLOR: blue">Nothing</span></span></font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">We will be printing the results on the console using a simple method shown here:</font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">C#</font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">static</span><span style="FONT-FAMILY: "Courier New""> <span style="COLOR: blue">void</span> PrintList(<span style="COLOR: #2b91af">IEnumerable</span><<span style="COLOR: blue">string</span>> str)</span></font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">{</font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">    <span style="COLOR: blue">foreach</span> (<span style="COLOR: blue">var</span> s <span style="COLOR: blue">in</span> str)</font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">        <span style="COLOR: #2b91af">Console</span>.WriteLine(s);</font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">    <span style="COLOR: #2b91af">Console</span>.WriteLine(<span style="COLOR: #a31515">"-------------"</span>);</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><span style="FONT-FAMILY: "Courier New""><font size="2">}</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">VB.NET</font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">Shared</span><span style="FONT-FAMILY: "Courier New""> <span style="COLOR: blue">Sub</span> PrintList(<span style="COLOR: blue">ByVal</span> str <span style="COLOR: blue">As</span> IEnumerable(<span style="COLOR: blue">Of</span> <span style="COLOR: blue">String</span>))</span></font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">      <span style="COLOR: blue">For</span> <span style="COLOR: blue">Each</span> s <span style="COLOR: blue">In</span> str</font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">            Console.WriteLine(s)</font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">      <span style="COLOR: blue">Next</span> s</font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">      Console.WriteLine("-------------")</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">End</span><span style="FONT-FAMILY: "Courier New""> <span style="COLOR: blue">Sub</span></span></font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">Let us get started. </font></div> <div style="MARGIN: 10pt 0cm 0pt"><b><font size="5"><font color="#4f81bd" size="4" face="Cambria">1. Order the elements of a List<string> first by Length and then by words</font></font></b></div> <div style="MARGIN: 0cm 0cm 10pt"> </div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">Use the </font><a href="http://msdn.microsoft.com/en-us/library/system.linq.enumerable.orderby.aspx"><font size="2" face="Verdana">Enumerable.OrderBy</font></a><font size="2" face="Verdana"> and </font><a href="http://msdn.microsoft.com/en-us/library/system.linq.enumerable.thenbydescending.aspx"><font size="2" face="Verdana">Enumerable.ThenByDescending</font></a><font size="2" face="Verdana"> method</font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">C#</font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New"; COLOR: green"><font size="2">// Order by Length then by words (descending)</font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">lstNew = lstThree.OrderBy(x => x.Length)</font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">        .ThenByDescending(x => x);</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><span style="FONT-FAMILY: "Courier New""><font size="2">PrintList(lstNew);</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">VB.NET</font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">lstNew = lstThree.OrderBy(<span style="COLOR: blue">Function</span>(x) x.Length).ThenByDescending(<span style="COLOR: blue">Function</span>(x) x)</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><span style="FONT-FAMILY: "Courier New""><font size="2">PrintList(lstNew)</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">OUTPUT</font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana"><img alt="MtoJ" src="http://i849.photobucket.com/albums/ab56/a2zknowledge/LINQ/19012010MtoJ.png" /></font></div> <div style="MARGIN: 10pt 0cm 0pt"><b><font size="5"><font color="#4f81bd" size="4" face="Cambria">2. Create a new string by combining all words of a List<string></font></font></b></div> <div style="MARGIN: 0cm 0cm 10pt"> </div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">Use the </font><a href="http://msdn.microsoft.com/en-us/library/system.linq.enumerable.aggregate.aspx"><font size="2" face="Verdana">Enumerable.Aggregate</font></a><font size="2" face="Verdana"> method</font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">C#</font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New"; COLOR: green"><font size="2">// Create a string by combining all words of a List<string></font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New"; COLOR: green"><font size="2">// Use StringBuilder if you want performance</font></span></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">string</span><span style="FONT-FAMILY: "Courier New""> delim = <span style="COLOR: #a31515">","</span>;</span></font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">var</span><span style="FONT-FAMILY: "Courier New""> str = lstOne.Aggregate((x, y) => x + delim + y);</span></font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: #2b91af">Console</span><span style="FONT-FAMILY: "Courier New"">.WriteLine(str);</span></font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: #2b91af">Console</span><span style="FONT-FAMILY: "Courier New"">.WriteLine(<span style="COLOR: #a31515">"-------------"</span>);</span></font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">VB.NET</font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">Dim</span><span style="FONT-FAMILY: "Courier New""> delim <span style="COLOR: blue">As</span> <span style="COLOR: blue">String</span> = ","</span></font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">Dim</span><span style="FONT-FAMILY: "Courier New""> str = lstOne.Aggregate(<span style="COLOR: blue">Function</span>(x, y) x & delim & y)</span></font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">Console.WriteLine(str)</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><span style="FONT-FAMILY: "Courier New""><font size="2">Console.WriteLine("-------------")</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">Note: You should use a StringBuilder for performance</font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">OUTPUT</font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana"><img alt="SingleLineJtoM" src="http://i849.photobucket.com/albums/ab56/a2zknowledge/LINQ/19012010SingleLineJtoM.png" /></font></div> <div style="MARGIN: 10pt 0cm 0pt"><b><font size="5"><font color="#4f81bd" size="4" face="Cambria">3. Create a List<string> from a Delimited string</font></font></b></div> <div style="MARGIN: 0cm 0cm 10pt"> </div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">Split the string and use the </font><a href="http://msdn.microsoft.com/en-us/library/bb342261.aspx"><font size="2" face="Verdana">Enumerable.ToList</font></a><font size="2" face="Verdana"> method</font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">C#</font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New"; COLOR: green"><font size="2">// Create a List<string> from a Delimited string</font></span></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">string</span><span style="FONT-FAMILY: "Courier New""> s = <span style="COLOR: #a31515">"January February March"</span>;</span></font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">char</span><span style="FONT-FAMILY: "Courier New""> separator = <span style="COLOR: #a31515">' '</span>;</span></font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">lstNew = s.Split(separator).ToList();</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><span style="FONT-FAMILY: "Courier New""><font size="2">PrintList(lstNew);</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">VB.NET</font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">Dim</span><span style="FONT-FAMILY: "Courier New""> s <span style="COLOR: blue">As</span> <span style="COLOR: blue">String</span> = "January February March"</span></font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">Dim</span><span style="FONT-FAMILY: "Courier New""> separator <span style="COLOR: blue">As</span> <span style="COLOR: blue">Char</span> = " "c</span></font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">lstNew = s.Split(separator).ToList()</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><span style="FONT-FAMILY: "Courier New""><font size="2">PrintList(lstNew)</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">OUTPUT</font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana"><img alt="JtoM" src="http://i849.photobucket.com/albums/ab56/a2zknowledge/LINQ/19012010MtoM.png" /></font></div> <div style="MARGIN: 10pt 0cm 0pt"><b><font size="5"><font color="#4f81bd" size="4" face="Cambria">4. Convert a List<int> to List<string></font></font></b></div> <div style="MARGIN: 0cm 0cm 10pt"> </div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">Use the </font><a href="http://msdn.microsoft.com/en-us/library/73fe8cwf.aspx"><font size="2" face="Verdana">List(T).ConvertAll</font></a><font size="2" face="Verdana"> method</font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">C#</font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New"; COLOR: green"><font size="2">// Convert a List<int> to List<string></font></span></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: #2b91af">List</span><span style="FONT-FAMILY: "Courier New""><<span style="COLOR: blue">int</span>> lstNum = <span style="COLOR: blue">new</span> <span style="COLOR: #2b91af">List</span><<span style="COLOR: blue">int</span>>(<span style="COLOR: blue">new</span> <span style="COLOR: blue">int</span>[] { 3, 6, 7, 9 });</span></font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">lstNew = lstNum.ConvertAll<<span style="COLOR: blue">string</span>>(<span style="COLOR: blue">delegate</span>(<span style="COLOR: blue">int</span> i) </font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">{</font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">   <span style="COLOR: blue">return</span> i.ToString(); </font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">});</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><span style="FONT-FAMILY: "Courier New""><font size="2">PrintList(lstNew);</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">VB.NET</font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">Dim</span><span style="FONT-FAMILY: "Courier New""> lstNum <span style="COLOR: blue">As</span> <span style="COLOR: blue">New</span> List(<span style="COLOR: blue">Of</span> <span style="COLOR: blue">Integer</span>)(<span style="COLOR: blue">New</span> <span style="COLOR: blue">Integer</span>() { 3, 6, 7, 9 })</span></font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">lstNew = lstNum.ConvertAll(<span style="COLOR: blue">Of</span> <span style="COLOR: blue">String</span>)(<span style="COLOR: blue">Function</span>(i <span style="COLOR: blue">As</span> <span style="COLOR: blue">Integer</span>) i.ToString())</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><span style="FONT-FAMILY: "Courier New""><font size="2">PrintList(lstNew)</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">OUTPUT</font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana"><img alt="Numbers" src="http://i849.photobucket.com/albums/ab56/a2zknowledge/LINQ/10012010Numbers.png" /></font></div> <div style="MARGIN: 10pt 0cm 0pt"><b><font size="5"><font color="#4f81bd" size="4" face="Cambria">5. Count Repeated Words in a List<string></font></font></b></div> <div style="MARGIN: 0cm 0cm 10pt"> </div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">Use </font><a href="http://msdn.microsoft.com/en-us/library/system.linq.enumerable.groupby.aspx"><font size="2" face="Verdana">Enumerable.GroupBy</font></a><font size="2" face="Verdana">, </font><a href="http://msdn.microsoft.com/en-us/library/system.linq.enumerable.select.aspx"><font size="2" face="Verdana">Enumerable.Select</font></a><font size="2" face="Verdana"> and </font><a href="http://msdn.microsoft.com/en-us/library/system.linq.enumerable.orderbydescending.aspx"><font size="2" face="Verdana">Enumerable.OrderByDescending</font></a></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">C#</font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New"; COLOR: green"><font size="2">// Count Repeated Words</font></span></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">var</span><span style="FONT-FAMILY: "Courier New""> q = lstFour.GroupBy(x => x)</span></font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">   .Select(g => <span style="COLOR: blue">new</span> { Value = g.Key, Count = g.Count() })</font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">   .OrderByDescending(x => x.Count);</font></span></div> <div style="LINE-HEIGHT: normal"> </div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">foreach</span><span style="FONT-FAMILY: "Courier New""> (<span style="COLOR: blue">var</span> x <span style="COLOR: blue">in</span> q)</span></font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">{</font></span></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">   <span style="COLOR: #2b91af">Console</span>.WriteLine(<span style="COLOR: #a31515">"Value: "</span> + x.Value + <span style="COLOR: #a31515">" Count: "</span> + x.Count);</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><span style="FONT-FAMILY: "Courier New""><font size="2">}</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">VB.NET</font></div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">Dim</span><span style="FONT-FAMILY: "Courier New""> q = lstFour.GroupBy(<span style="COLOR: blue">Function</span>(x) x).Select(<span style="COLOR: blue">Function</span>(g) <span style="COLOR: blue">New</span> <span style="COLOR: blue">With</span> {Key .Value = g.Key, Key .Count = g.Count()}).OrderByDescending(<span style="COLOR: blue">Function</span>(x) x.Count)</span></font></div> <div style="LINE-HEIGHT: normal"> </div> <div style="LINE-HEIGHT: normal"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">For</span><span style="FONT-FAMILY: "Courier New""> <span style="COLOR: blue">Each</span> x <span style="COLOR: blue">In</span> q</span></font></div> <div style="LINE-HEIGHT: normal"><span style="FONT-FAMILY: "Courier New""><font size="2">   Console.WriteLine("Value: " & x.Value & " Count: " & x.Count)</font></span></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2"><span style="FONT-FAMILY: "Courier New"; COLOR: blue">Next</span><span style="FONT-FAMILY: "Courier New""> x</span></font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">OUTPUT</font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana"><img alt="ValueandMonth" src="http://i849.photobucket.com/albums/ab56/a2zknowledge/LINQ/19012010ValueandMonth.png" /></font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">These were some more List<string> operations. The entire <strong>source code</strong> of this article can be downloaded over <strong><a href="http://cid-2c5f5b0560e374cb.skydrive.live.com/self.aspx/.Public/Uploads/CompareLists-II.zip">here</a></strong>. You can also read the first part of this article over here </font><a href="https://www.dotnetcurry.com/ShowArticle.aspx?ID=447"><font color="#800080" size="2" face="Verdana">Some Common Operations using List - Part I</font></a>. </div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana">I hope you liked this article and I thank you for viewing it.</font></div> <div style="MARGIN: 0cm 0cm 10pt"><font size="2" face="Verdana"> <div style="MARGIN: 0cm 0cm 10pt" align="justify"><span style="LINE-HEIGHT: 115%; FONT-FAMILY: "Verdana", "sans-serif"; FONT-SIZE: 10pt"><span style="LINE-HEIGHT: 115%; FONT-FAMILY: "Verdana", "sans-serif"; FONT-SIZE: 10pt"><font size="2" face="Verdana">If you liked the article, </font><a href="http://feeds.feedburner.com/netCurryRecentArticles" type="application/rss+xml" rel="alternate"><font size="2" face="Verdana"><img style="BORDER-RIGHT-WIDTH: 0px; BORDER-TOP-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; VERTICAL-ALIGN: middle; BORDER-LEFT-WIDTH: 0px" alt="" src="http://www.feedburner.com/fb/images/pub/feed-icon16x16.png" /></font></a><font size="2" face="Verdana"> </font><a href="http://feeds2.feedburner.com/netCurryRecentArticles" type="application/rss+xml" rel="alternate"><font size="2" face="Verdana">Subscribe to the RSS Feed</font></a><font size="2" face="Verdana"> <font color="#000000">or</font> </font><a href="http://www.feedburner.com/fb/a/emailverifySubmit?feedId=1571277&loc=en_US"><font size="2" face="Verdana">Subscribe Via Email</font></a><br /></span></span></div> </font></div> <p><em>This article has been editorially reviewed by </em><a href="https://www.dotnetcurry.com/author/suprotim-agarwal"><em>Suprotim Agarwal.</em></a></p> <div id="csharpbook" class="col-xs-12 col-sm-12 col-md-12 col-lg-12 articletext">  <div class="col-md-3 col-sm-3 col-xs-12"> <a href="https://www.dotnetcurry.com/csharpbook" target="_blank"><img alt="Absolutely Awesome Book on C# and .NET" src="/csharpbook/images/csharp-book-ad.jpg" /></a> </div> <div class="col-md-9 col-sm-9 col-xs-12"> <p>C# and .NET have been around for a very long time, but their constant growth means there’s always more to learn.</p> <p>We at DotNetCurry are very excited to announce <strong><a href="https://www.dotnetcurry.com/csharpbook" target="_blank">The Absolutely Awesome Book on C# and .NET</a></strong>. 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this.src='/images/authors/NoImage.jpg';" src="images/authors/Suprotim%20Agarwal.jpg" style="border-width:0px;" /> </div> <div class="author-desc caption"> Suprotim Agarwal, MCSD, MCAD, MCDBA, MCSE, is the founder of <a href='http://www.dotnetcurry.com'>DotNetCurry</a>, <a href='http://www.dotnetcurry.com/magazine'>DNC Magazine for Developers</a>, <a href='http://www.sqlservercurry.com' target='_blank'>SQLServerCurry</a> and <a href='http://www.devcurry.com' target='_blank'>DevCurry</a>. He has also authored a couple of books <a href='http://www.dotnetcurry.com/order/jQueryASPNETRecipesBook.aspx'>51 Recipes using jQuery with ASP.NET Controls</a> and <a href='http://www.jquerycookbook.com' target='_blank'>The Absolutely Awesome jQuery CookBook</a>.<p></p><p>Suprotim has received the prestigious <a href='https://mvp.microsoft.com/en-US/Overview'>Microsoft MVP award</a> for Sixteen consecutive years. In a professional capacity, he is the CEO of A2Z Knowledge Visuals Pvt Ltd, a digital group that offers Digital Marketing and Branding services to businesses, both in a start-up and enterprise environment.</p><p>Get in touch with him on Twitter @<a href='http://twitter.com/suprotimagarwal' target='_blank'>suprotimagarwal</a> or at <a href='https://www.linkedin.com/in/suprotimagarwal'>LinkedIn</a></p> </div> </div> </div> </div> </div> </div>  <div class="marginspace"> <div id='ban-pos-9-90'></div> <div id='ban-pos-10-90'></div> <div id='ban-pos-11-90'></div> </div> <br /><br /> <div class="col-xs-12 col-sm-12 col-md-12"> <img src="/images/copyscape.gif" alt="Page copy protected against web site content infringement by Copyscape" title="Do not copy content from the page. Plagiarism will be detected by Copyscape." height="16" border="0"/> </div> <br /><br /> <br /> <hr /> <div id="ctl00_MainContent_panComments" class="col-md-12 spacer"> <div class="footerheading">Feedback - Leave us some adulation, criticism and everything in between!</div> <ul class="tabHeader"> <li><a class="show-comments" href="#t1">Click here to post your Comments</a> </li> <li><a href="#t2">Old Comments (Read Only)</a> </li> </ul> <div class="tabContent"> <div id="t1" class="col-md-12 column"> <div id="disqus_thread"></div>  </div> <div id="t2"> <table id="ctl00_MainContent_dlstComments" class="table col-xs-4 col-sm-6 col-md-12" cellspacing="0" border="0" style="color:#333333;border-collapse:collapse;"> <tr> <td style="color:#333333;background-color:#EFEFE3;"> <div> <table class="table"> <tr><td class="row"> <b>Comment posted by <span id="ctl00_MainContent_dlstComments_ctl00_lnkAddedBy" style="color:#6592C6;">John Bubriski</span> on Thursday, January 21, 2010 10:08 AM </b> </td> <td style="text-align: right;"> </td></tr> </table> Here is shorthand for converting the List<int> to List<string>: <br> <br>var lstNum = new List<int> { 3, 6, 7, 9 }; <br>var lstNew = lstNum.ConvertAll<string>(i => i.ToString()); <br> <br>You don't need the whole delegate syntax, nor do you need to create an array of integers to pass to the list.  You can use the array initialization syntax with Lists. </div> </td> </tr><tr> <td style="color:White;background-color:#990000;font-weight:bold;"> </td> </tr> </table> </div>  </div>  </div>   </div> <div id="rightcol" class="col-md-4">  <div class="margin-vertical-20" /> <div class="side-widget"> <div class="featured-tools"> <span>Featured Tools</span> <div id="creatives"> <div id='ban-pos-1' style='display: none'> </div> <div id='ban-pos-2'> <div class="padding-vertical-10"></div> </div> <div id='ban-pos-3'> </div> <div class="padding-vertical-10"></div> <div id='ban-pos-4-250'> </div> <div id='ban-pos-5-250'> </div> <div 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Some Common Operations using List - Part II | DotNetCurry