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I have a bunch of IEnumerable Collections which exact number and types is subject of frequent changes (due to automatic code generation). It looks something like this: public class MyCollections { public System.Collections.Generic.IEnumerable<SomeType> SomeTypeCollection; public System.Collections.Generic.IEnumerable<OtherType> OtherTypeCollection; ... At runtime i want to determine each Type and it's count without having to rewrite the code after every code generation. So i am looking for a generic approach using reflection. The result i am looking for is something like: MyType: 23 OtherType: 42 My problem is that i can't figure how to invoke the Count method properly. Here is what i have so far: // Handle to the Count method of System.Linq.Enumerable MethodInfo countMethodInfo = typeof(System.Linq.Enumerable).GetMethod("Count", new Type[] { typeof(IEnumerable<>) }); PropertyInfo[] properties = typeof(MyCollections).GetProperties(); foreach (PropertyInfo property in properties) { Type propertyType = property.PropertyType; if (propertyType.IsGenericType) { Type genericType = propertyType.GetGenericTypeDefinition(); if (genericType == typeof(IEnumerable<>)) { // access the collection property object collection = property.GetValue(someInstanceOfMyCollections, null); // access the type of the generic collection Type genericArgument = propertyType.GetGenericArguments()[0]; // make a generic method call for System.Linq.Enumerable.Count<> for the type of this collection MethodInfo localCountMethodInfo = countMethodInfo.MakeGenericMethod(genericArgument); // invoke Count meth

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