Instantiating a class in the same .dll using reflection based on the class name?

Question

This should be simple but I can't find anywhere that tells me how to do this. I've got a class, it's in the same dll as the one I am using to do this.

All I want to do is something like.

thing.InstanceClass("ClassName");

I would like to do this without doing:

Assembly testAssembly = Assembly.LoadFile(@"c:\Test.dll");

And that is because the classes I would like to instance using reflection are in the same assembly.

Answer 1

Type instanceType = Type.GetType("SomeNamespace.SomeType");
object instance = Activator.CreateInstance(instanceType);

You can resolve it through Type.GetType(...) if the assembly is already loaded into the AppDomain.

If you need the assembly you can use Assembly.GetEntryAssembly , or possibly typeof(SomeType).Assembly where SomeType is in your target assembly.

Answer 2

我相信System.Activator.CreateInstance是您寻求的框架方法。

Answer 3

If it's a known (referenced, not COM etc.) type within your project, then the best way is to use the strongly-typed CreateInstance function:

MyClass instance = Activator.CreateInstance<MyClass>();

This will save much of performance cost since there is no boxing/unboxing.