如何在C#中检查运行时对象是否属于某种类型？

Question

如何在C#中检查运行时对象是否属于某种类型？

Answer 1

您可以使用is关键字.例如:

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;
    }
} 

产生输出:

fred is not an integer 
10 is an integer