How do I check object type using the is keyword?
Category: System, viewed: 1K time(s).
Using the is keyword we can check if an object is an instance of a specified class. This is expression returns true if the object is an instance of the speficied class or if the object is inherited from the specified class. The is expression returns true if the provided object is non-null, and the specified object can be casted to the specified object type without throwing an exception.
using System;
using System.Collections;
namespace Kodecsharp.Example.System {
class IsInstanceOfExample {
public static void Main(string[] args) {
ArrayList list = new ArrayList();
list.Add("Hello");
list.Add(Int32.Parse("10"));
list.Add(new DateTime());
list.Add(Double.Parse("10.99"));
list.Add(true);
list.Add(new A());
list.Add(new B());
for (int i = 0; i < list.Count; i++) {
Object o = list[i];
if (o is string) {
Console.WriteLine("\"" + (string)o + "\" is a string");
} else if (o is Int32) {
Console.WriteLine("\"" + (Int32)o + "\" is an Int32");
} else if (o is Double) {
Console.WriteLine("\"" + (Double)o + "\" is a Double");
} else if (o is DateTime) {
Console.WriteLine("\"" + (DateTime)o + "\" is a DateTime");
} else if (o is A) {
Console.WriteLine("\"" + o + "\" is an A");
} else {
Console.WriteLine("\"" + o + "\" is a " + o.GetType());
}
}
Console.ReadLine();
}
}
class A {
}
class B : A {
}
}