Pass Type as parameter and check

I want to build a method that accepts parameter as Type like

void M1(Type t)
{
  // check which type it is
}

and call it like 

M1(typeof(int));

I have no idea how to check type in method body.

I have tried 

if (t is double)

But it is giving warning 

The given expression never provided type (double)

Please help me for checking the type of parameter.

Jon Skeet
people
quotationmark

If you want to check for an exact type, you can use:

if (t == typeof(double))

That's fine for double, given that it's a struct, so can't be inherited from.

If you want to perform a more is-like check - e.g. to check whether a type is compatible with System.IO.Stream - you can use Type.IsAssignableFrom:

if (typeof(Stream).IsAssignableFrom(t))

That will match if t is System.IO.MemoryStream, for example (or if it's System.IO.Stream itself).

I always find myself having to think slightly carefully to work out which way round the call goes, but the target of the call is usually a typeof expression.

people

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