The typeof operator is used to obtain the System.Type object for a type. A typeof expression takes the form:
where:
- type
- The type for which the System.Type object is obtained.
Remarks
The typeof operator cannot be overloaded.
To obtain the run-time type of an expression, you can use the .NET Framework method GetType.
Example
// cs_operator_typeof.cs
// Using typeof operator
using System;
using System.Reflection;
public class MyClass
{
public int intI;
public void MyMeth()
{
}
public static void Main()
{
Type t = typeof(MyClass);
// alternatively, you could use
// MyClass t1 = new MyClass();
// Type t = t1.GetType();
MethodInfo[] x = t.GetMethods();
foreach (MethodInfo xtemp in x)
{
Console.WriteLine(xtemp.ToString());
}
Console.WriteLine();
MemberInfo[] x2 = t.GetMembers();
foreach (MemberInfo xtemp2 in x2)
{
Console.WriteLine(xtemp2.ToString());
}
}
}
Output
Int32 GetHashCode()
Boolean Equals(System.Object)
System.String ToString()
Void MyMeth()
Void Main()
System.Type GetType()
Int32 intI
Int32 GetHashCode()
Boolean Equals(System.Object)
System.String ToString()
Void MyMeth()
Void Main()
System.Type GetType()
Void .ctor()
Example
// cs_operator_typeof2.cs
// Using GetType method
using System;
class GetTypeTest
{
public static void Main()
{
int radius = 3;
Console.WriteLine("Area = {0}", radius*radius*Math.PI);
Console.WriteLine("The type is {0}",
(radius*radius*Math.PI).GetType());
}
}
Output
Area = 28.2743338823081
The type is System.Double
See Also
C# Keywords | is | Operator Keywords