CODEWITHSUNDEEP
c#reflection
Fugu
Fugu

Reputation: 361

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

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.

Upvotes: 0

Views: 273

Answers (3)

Shimmy Weitzhandler
Shimmy Weitzhandler

Reputation: 104692

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.

Upvotes: 0

Ian Nelson
Ian Nelson

Reputation: 58703

I believe System.Activator.CreateInstance is the framework method you seek.

Upvotes: 0

Matthew Abbott
Matthew Abbott

Reputation: 61589

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.

Upvotes: 5

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