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    <p>You could use the <a href="http://msdn.microsoft.com/en-us/library/system.codedom.aspx" rel="nofollow noreferrer">CodeDom</a> to create a <a href="http://msdn.microsoft.com/en-us/library/system.codedom.codevariabledeclarationstatement.aspx" rel="nofollow noreferrer">CodeVariableDeclarationStatement</a>, and retrieve the Type property:</p> <pre><code>var stmt = new CodeVariableDeclarationStatement("string", "test"); string systemTypeName = stmt.Type.BaseType; </code></pre> <p>I am not sure whether you can use CodeDom classes that independently, but it should be an easy way to get from "string" to "System.String" without needing to create a lookup function using <em>switch</em>.</p> <p>EDIT:</p> <p>Thinking about it more, it <em>may</em> be possible to simply use a <a href="http://msdn.microsoft.com/en-us/library/system.codedom.codetypereference.aspx" rel="nofollow noreferrer">CodeTypeReference</a> directly, and shortcut the process above:</p> <pre><code>var systemTypeName = new CodeTypeReference("string").BaseType; </code></pre> <p>The CodeVariableDeclarationStatement.Type property is a CodeTypeReference. By using CodeTypeReference directly, you don't need to bother with a dummy variable name, and it can become a one-liner.</p> <p>WORKING EXAMPLE:</p> <p>I found the code that did this previously. It is a bit more complicated than I had hoped, but it gets the job done, and if the generated classes are cached, performance is good after initial compilation:</p> <pre><code>using System; using System.CodeDom; using System.Collections.Generic; using System.CodeDom.Compiler; using Microsoft.CSharp; using System.Diagnostics; namespace ConsoleApplication1 { public interface IDynamicTypeNameMapper { string GetTypeName(); } class Program { static readonly string[] csharpKeywords = new[] { "byte", "short", "int", "long", "float", "double", "string" }; static Dictionary&lt;string, IDynamicTypeNameMapper&gt; s_mappers; static void Main(string[] args) { s_mappers = new Dictionary&lt;string, IDynamicTypeNameMapper&gt;(); var provider = new CSharpCodeProvider(); var options = new CompilerParameters(); options.ReferencedAssemblies.Add("ConsoleApplication1.exe"); options.GenerateInMemory = true; var stopwatch = new Stopwatch(); stopwatch.Start(); foreach (string keyword in csharpKeywords) { string className = "DynamicTypeNameMapper_" + keyword; string literal = "using System; using ConsoleApplication1; namespace Test { public class " + className + ": IDynamicTypeNameMapper { public string GetTypeName() { return typeof(" + keyword + ").FullName; } } }"; var snippet = new CodeSnippetCompileUnit(literal); var results = provider.CompileAssemblyFromDom(options, snippet); var typeNameMapper = results.CompiledAssembly.CreateInstance("Test." + className) as IDynamicTypeNameMapper; if (typeNameMapper != null) { s_mappers.Add(keyword, typeNameMapper); Console.WriteLine(typeNameMapper.GetTypeName()); } } stopwatch.Stop(); Console.WriteLine("Inital time: " + stopwatch.Elapsed.ToString()); stopwatch.Reset(); stopwatch.Start(); for (int i = 0; i &lt; 1000; i++) { foreach (string keyword in csharpKeywords) { s_mappers[keyword].GetTypeName(); } } stopwatch.Stop(); Console.WriteLine("Cached time: " + stopwatch.Elapsed.ToString()); Console.ReadLine(); } } } </code></pre> <p>The output of this app is as follows:</p> <pre><code>System.Byte System.Int16 System.Int32 System.Int64 System.Single System.Double System.String Inital time: 00:00:00.3090559 Cached time: 00:00:00.0011934 </code></pre>
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    1. POWhat is the best way to get a proper type name from a C# keyword?
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    1. COVery short and slick. The user doesn't have to maintain a switch statement of types and it will still automatically work if Microsoft were to expand the data types of C# for any reason.
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    2. COAt least thats the hope. :P I haven't had time to actually test it yet...
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    3. COThis doesn't appear to work: in both cases, systemTypeName evaluates to just "string" on .NET 3.5. That said, there should be a way to make this work with CodeDom, but you'll probably need to use the CSharpCodeProvider, since the run-time only speaks IL.
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