Question

I have a MethodInfo passed in to a function and I want to do the following

MethodInfo containsMethod = typeof(ICollection<>).GetMethod("Contains");
if (methodInfo.Equals(containsMethod)
{
   // do something
}

But this doesn’t work because the methodInfo has a specific generic type. For the example does work if I knew that the ICollection was always of type string.

MethodInfo containsMethod = typeof(ICollection<string>).GetMethod("Contains");
if (methodInfo.Equals(containsMethod)
{
   // do something
}

How can I check whether the MethodInfo is a ANY typed instance of the generic method without caring what the type is?

Thanks.

EDIT: Question clarification

As correctly pointed out the method is not generic but the containing class is so the question is more how to I find out if the MethodInfo is for a Type which is a typed instance of ICollection<>.

EDIT: more context

I am writing a Linq provider and trying to handle the “in” case

IList<string> myList = new List<string>{ "1", "2" };

from Something s in ...
where myList.Contains(s.name)
select s;

Answer 1

You could check the declaring type:

if( methodInfo.Name == "Contains" 
    &&  methodInfo.DeclaringType.IsGenericType
    && methodInfo.DeclaringType.GetGenericTypeDefinition() == typeof(ICollection<>))
{