Passing an object to a generic method

Question

4.00/5 (1 vote)

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Say we have :

C#

public void method<T>(T obj)
{
   // some stuff done on the obj
}

And we have deserialized an object and we need to pass

C#

object obj = CreateObject(bytearray); // serialized byte[] of object
method(obj);

Now the problem is that method needs to know the object type for it to work (internal generics) but we are passing an object, so it will fail. However the CreateObject method can determine the type and it recreates the original without problem.

The question is : how can we somehow give the type information to method so it doesn't break at runtime?

Posted 19-Apr-12 21:23pm

Mehdi Gholam

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2 solutions

Solution 1

Hi,
I presume you want to pass the type using the Generics syntax. If so, you can pass it using something like this:

C#

Int32 iObj=0;
method<int32>(iObj);

or

C#

Stack sObj = new Stack();
method<stack>(sObj);

I'm not sure if your point is another mean of sending type to the 'method' method?

Cheers

Posted 19-Apr-12 21:33pm

Reza Ahmadi

Updated 19-Apr-12 21:34pm

v2

Comments

Mehdi Gholam 20-Apr-12 3:34am

The type is only known at runtime, not compile time.

Reza Ahmadi 20-Apr-12 3:37am

Then you need to use Reflection, or something like that.

Reza Ahmadi 20-Apr-12 3:42am

Another way might be using interface for a wide range of types in order to make them usable in your method. I think I got your point but it does not seem to be possible in C# compiler.

Cheers

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Mehdi Gholam · Accepted Answer · 2012-04-19T21:50:00

Solution 2

Found the solution as :

C#

object obj = CreateObject(bytearray);

var mi = this.GetType().GetMethod("method", BindingFlags.Instance | BindingFlags.NonPublic);
var m = mi.MakeGenericMethod(new Type[] { obj.GetType() });
m.Invoke(this, new object[] { obj }); // instead of method(obj);

Posted 19-Apr-12 21:50pm

Mehdi Gholam

Passing an object to a generic method

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Passing an object to a generic method

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