How to Check if an Object is a Generic Type in C#?

How to Test if an Object is of Generic Type in C#

Question:

You want to verify if an object belongs to a generic type. However, your attempt using list.GetType() == typeof(List<>) returns false. How can you perform this test correctly?

Answer:

Determine the specific type of test you need:

Checking Instance of Generic Type:

To simply check if the object is an instance of a generic type, use:

return list.GetType().IsGenericType;

Checking for Generic List:

If you need to specifically verify if the object is an instance of List:

return list.GetType().GetGenericTypeDefinition() == typeof(List<>);

Note that the latter test checks for exact type equivalence. If the object inherits from List or implements a generic interface, the test will return false.

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