is Operator:
- is operator Checks if an object is compatible with a given type
- An is expression evaluates to true if the provided expression is non-null, and the provided object can be cast to the provided type without causing an exception to be thrown.
as Operator:
- The as operator is used to perform conversions between compatible reference types
- The as operator is like a cast operation. However, if the conversion is not possible, as returns null instead of raising an exception
Ex:
public class Exam
{
public string GetSubjectName()
{
return “C#”;
}
}
public class UnitTest
{
public int GetTestNumber()
{
return 1;
}
}
public partial class CSHARPSAMPLES_Keywords : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Exam e1 = new Exam();
}
public void Test(object o)
{
if (o is UnitTest)
{
UnitTest u = o as UnitTest;
u.GetTestNumber();
}
else if (o is Exam)
{
Exam e = o as Exam;
e.GetSubjectName();
}
}
}
