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    <p>You have to look in all the assemblies where the extension method may be defined.</p> <p>Look for classes decorated with <a href="http://msdn.microsoft.com/en-us/library/system.runtime.compilerservices.extensionattribute.aspx" rel="noreferrer"><code>ExtensionAttribute</code></a>, and then methods within that class which are <em>also</em> decorated with <code>ExtensionAttribute</code>. Then check the type of the first parameter to see if it matches the type you're interested in.</p> <p>Here's some complete code. It could be more rigorous (it's not checking that the type isn't nested, or that there is at least one parameter) but it should give you a helping hand.</p> <pre><code>using System; using System.Runtime.CompilerServices; using System.Reflection; using System.Linq; using System.Collections.Generic; public static class FirstExtensions { public static void Foo(this string x) {} public static void Bar(string x) {} // Not an ext. method public static void Baz(this int x) {} // Not on string } public static class SecondExtensions { public static void Quux(this string x) {} } public class Test { static void Main() { Assembly thisAssembly = typeof(Test).Assembly; foreach (MethodInfo method in GetExtensionMethods(thisAssembly, typeof(string))) { Console.WriteLine(method); } } static IEnumerable&lt;MethodInfo&gt; GetExtensionMethods(Assembly assembly, Type extendedType) { var query = from type in assembly.GetTypes() where type.IsSealed &amp;&amp; !type.IsGenericType &amp;&amp; !type.IsNested from method in type.GetMethods(BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic) where method.IsDefined(typeof(ExtensionAttribute), false) where method.GetParameters()[0].ParameterType == extendedType select method; return query; } } </code></pre>
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    1. POReflection to Identify Extension Methods
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    1. CONice code. You could rule out a bunch of methods using the fact that: Extension methods must be defined in a non-generic static class. where !type.IsGenericType && type.IsSealed
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      1. USAmy B
    2. COTrue, that's a reasonably simple test. It's a shame that there isn't an equivalent of IsDefined for Type :) I'll edit the answer with that code.
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    3. CODoesn't work if the extended type is a generic. Extension-methods for IQueryable will match, but not for IQueryable<>, for example. I think it fails on the ParameterType.
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      1. USSeb Nilsson
 

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