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POCreate open constructed type from string
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  1. POCreate open constructed type from string
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    copied!<p>Let's say I have the following class.</p> <pre><code>MyClass&lt;T&gt; { public void MyMethod(T a, List&lt;T&gt; b, List&lt;Tuple&lt;T, string&gt;&gt; c) {} } </code></pre> <p>I can get the type of the arguments of the method as follow</p> <pre><code>Type testType = typeof(MyClass&lt;&gt;); MethodInfo myMethodInfo = testType.GetMethod("MyMethod"); Type[] paramTypes = myMethodInfo.GetParameters().Select(pi =&gt; pi.ParameterType); </code></pre> <p>How can I manually create an array containing the <strong>same open types</strong> as <code>paramTypes</code> from a string? For ex from</p> <pre><code>var typesAsStr = new string[] {"T", "List`1[T]", "List`1[Tuple`2[T, string]]"}; </code></pre> <p><strong>If</strong> I had <code>MyClass&lt;int&gt;</code>, I could do something like <code>Type.GetType(fullQualifiedNameOfArg)</code> for each argument, <strong>but</strong> here I want to keep the generic argument T:</p> <ul> <li>I can't create "a": I can't do <code>Type.GetType("T")</code></li> <li>I can almost create "b": I can do <code>Type.GetType("List</code> <code>`1")</code>, but the info on "T" is not yet present</li> <li>I don't know how to create "c"</li> </ul> <p>I ended up needing this when converting a Mono.Cecil type into a .net type: Cecil gives me the info on a method named <code>"MyMethod"</code> with arguments <code>"T"</code>, <code>"List&lt;T&gt;"</code> and <code>"List&lt;Tuple&lt;T, string&gt;&gt;"</code>. I then want to get that method using reflection (if there are several methods with the same name and argument numbers, I have to check the args to know which one it is), that's why I'd want to have a way to transform what Cecil tells me into what .Net knows, to be able to compare with what's in <code>paramTypes</code>.</p> <p>I've also seen several other people asking how to convert a Mono.Cecil type into a .Net one, so that's also why I thought I'd try.</p>
 

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