How can I check if an object is of a certain type at runtime in C#?

Question

How can I check if an object is of a certain type at runtime in C#?

Answer 1

You can use the is keyword. For example:

using System; 

class CApp
{
    public static void Main()
    { 
        string s = "fred"; 
        long i = 10; 

        Console.WriteLine( "{0} is {1}an integer", s, (IsInteger(s) ? "" : "not ") ); 
        Console.WriteLine( "{0} is {1}an integer", i, (IsInteger(i) ? "" : "not ") ); 
    }

    static bool IsInteger( object obj )
    { 
        if( obj is int || obj is long )
            return true; 
        else 
            return false;
    }
} 

produces the output:

fred is not an integer 
10 is an integer

Answer 2

MyType myObjectType = argument as MyType;

if(myObjectType != null)
{
   // this is the type
}
else
{
   // nope
}

null-check included

Edit: mistake correction