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  1. PO
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    <p>You want System.Reflection.ParameterInfo.ParameterType.IsGenericParameter. Here's a VS2008 unit test that passes that illustrates this:</p> <p>Class:</p> <pre><code>public class Foo&lt;T&gt; { public Foo(T val) { this.Value = val.ToString(); } public Foo(string val) { this.Value = "--" + val + "--"; } public string Value { get; set; } } </code></pre> <p>Test method:</p> <pre><code>Foo&lt;string&gt; f = new Foo&lt;string&gt;("hello"); Assert.AreEqual("--hello--", f.Value); Foo&lt;int&gt; g = new Foo&lt;int&gt;(10); Assert.AreEqual("10", g.Value); Type t = typeof(Foo&lt;string&gt;); t = t.GetGenericTypeDefinition(); Assert.AreEqual(2, t.GetConstructors().Length); System.Reflection.ConstructorInfo c = t.GetConstructors()[0]; System.Reflection.ParameterInfo[] parms = c.GetParameters(); Assert.AreEqual(1, parms.Length); Assert.IsTrue(parms[0].ParameterType.IsGenericParameter); c = t.GetConstructors()[1]; parms = c.GetParameters(); Assert.AreEqual(1, parms.Length); Assert.IsFalse(parms[0].ParameterType.IsGenericParameter); </code></pre> <p>The notable point here is the parms[0].ParameterType.IsGenericParameter check which checks if the parameter is a generic or not.</p> <p>Once you've found your constructor then you've got the ConstructorInfo to pass to Emit.</p> <pre><code>public System.Reflection.ConstructorInfo FindStringConstructor(Type t) { Type t2 = t.GetGenericTypeDefinition(); System.Reflection.ConstructorInfo[] cs = t2.GetConstructors(); for (int i = 0; i &lt; cs.Length; i++) { if (cs[i].GetParameters()[0].ParameterType == typeof(string)) { return t.GetConstructors()[i]; } } return null; } </code></pre> <p>Not exactly sure what your intention is though.</p>
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    1. POGeneric constructors and reflection
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    1. COThanks for your answer - the problem here is that you use "Type t = typeof(Foo<>);" - it will not work anymore with "Type t = typeof(Foo<string>);"
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    2. COcall GetGenericTypeDefinition() to get it on Foo<> then the constructor indexes still map to the same constructor. So you can reflect on Foo<>..ctor to find the correct index then use the matching Foo<string>..ctor to your IL generator. As far as I can tell you lose all generic-ness when you go with Foo<string>.
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    3. COGetGenericTypeDefinition() was exactly what I missed. Thank you very much!
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