C# – How to call a static method using reflection

Here’s how to call a static method using reflection:

MethodInfo builderMethod = typeof(Type).GetMethod(StaticMethodName, BindingFlags.Static | BindingFlags.Public); var request = (ReturnType)builderMethod.Invoke(null, null);

Note: This static method is parameterless. If you have parameters, you have to pass them in like this .Invoke(null, param1, param2).

Example – passing static method names to a parameterized unit test

With parameterized tests you can only pass in compile-time constants. This means you can’t pass object instances or delegates (Action/Func/Lambda).

I have a class called RequestProcessor that processes IRequest objects. I want to verify it can successfully process the different types of requests built using RequestBuilder. And I want to use a parameterized test so I don’t have to duplicate test code.

I can’t pass in the request objects or delegates pointing to the builder methods. Instead, I can pass in the method names, then use reflection to look them up and execute them.

[DataRow(nameof(RequestBuilder.BuildAuthRequest))] [DataRow(nameof(RequestBuilder.BuildRefundRequest))] [DataRow(nameof(RequestBuilder.BuildVoidRequest))] [TestMethod()] public void TestProcessRequest_WhenValidRequest_ReturnsTrue(string builderMethodName) { //arrange var requestProcessor = new RequestProcessor(); MethodInfo builderMethod = typeof(RequestBuilder).GetMethod(builderMethodName, BindingFlags.Static | BindingFlags.Public); IRequest request = (IRequest)builderMethod.Invoke(null, null); //act var actual = requestProcessor.Process(request); //assert Assert.IsTrue(actual); }

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