Type.GetTypeHandle(Object) Method

Reference

Definition

Namespace:: System

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: Type.cs

Source:: Type.cs

Source:: Type.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets the handle for the Type of a specified object.

public:
 static RuntimeTypeHandle GetTypeHandle(System::Object ^ o);

public static RuntimeTypeHandle GetTypeHandle (object o);

static member GetTypeHandle : obj -> RuntimeTypeHandle

Public Shared Function GetTypeHandle (o As Object) As RuntimeTypeHandle

Parameters

o: Object

The object for which to get the type handle.

Returns

RuntimeTypeHandle

The handle for the Type of the specified Object.

Exceptions

ArgumentNullException

o is null.

Examples

The following example defines the class MyClass1, gets an instance of it, and retrieves the runtime handle of the object.

using namespace System;
using namespace System::Reflection;

public ref class MyClass1
{
private:
    int x;

public:
    int MyMethod()
    {
        return x;
    }
};

int main()
{
    MyClass1^ myClass1 = gcnew MyClass1;
   
    // Get the RuntimeTypeHandle from an object.
    RuntimeTypeHandle myRTHFromObject = Type::GetTypeHandle( myClass1 );
   
    // Get the RuntimeTypeHandle from a type.
    RuntimeTypeHandle myRTHFromType = MyClass1::typeid->TypeHandle;

    Console::WriteLine( "\nmyRTHFromObject.Value:  {0}", myRTHFromObject.Value );
    Console::WriteLine( "myRTHFromObject.GetType():  {0}", myRTHFromObject.GetType() );
    Console::WriteLine( "Get the type back from the handle..." );
    Console::WriteLine( "Type::GetTypeFromHandle(myRTHFromObject):  {0}", 
        Type::GetTypeFromHandle(myRTHFromObject) );

    Console::WriteLine( "\nmyRTHFromObject.Equals(myRTHFromType):  {0}", 
        myRTHFromObject.Equals(myRTHFromType) );

    Console::WriteLine( "\nmyRTHFromType.Value:  {0}", myRTHFromType.Value );
    Console::WriteLine( "myRTHFromType.GetType():  {0}", myRTHFromType.GetType() );
    Console::WriteLine( "Get the type back from the handle..." );
    Console::WriteLine( "Type::GetTypeFromHandle(myRTHFromType):  {0}", 
        Type::GetTypeFromHandle(myRTHFromType) );
}

/* This code example produces output similar to the following:

myRTHFromObject.Value:  3295832
myRTHFromObject.GetType():  System.RuntimeTypeHandle
Get the type back from the handle...
Type::GetTypeFromHandle(myRTHFromObject):  MyClass1

myRTHFromObject.Equals(myRTHFromType):  True

myRTHFromType.Value:  3295832
myRTHFromType.GetType():  System.RuntimeTypeHandle
Get the type back from the handle...
Type::GetTypeFromHandle(myRTHFromType):  MyClass1
 */

using System;
using System.Reflection;

public class MyClass1
{
    private int x=0;
    public int MyMethod()
    {
        return x;
    }
}

public class MyClass2
{
    public static void Main()
    {
        MyClass1 myClass1 = new MyClass1();

        // Get the RuntimeTypeHandle from an object.
        RuntimeTypeHandle myRTHFromObject = Type.GetTypeHandle(myClass1);
        // Get the RuntimeTypeHandle from a type.
        RuntimeTypeHandle myRTHFromType = typeof(MyClass1).TypeHandle;

        Console.WriteLine("\nmyRTHFromObject.Value:  {0}", myRTHFromObject.Value);
        Console.WriteLine("myRTHFromObject.GetType():  {0}", myRTHFromObject.GetType());
        Console.WriteLine("Get the type back from the handle...");
        Console.WriteLine("Type.GetTypeFromHandle(myRTHFromObject):  {0}",
            Type.GetTypeFromHandle(myRTHFromObject));

        Console.WriteLine("\nmyRTHFromObject.Equals(myRTHFromType):  {0}",
            myRTHFromObject.Equals(myRTHFromType));

        Console.WriteLine("\nmyRTHFromType.Value:  {0}", myRTHFromType.Value);
        Console.WriteLine("myRTHFromType.GetType():  {0}", myRTHFromType.GetType());
        Console.WriteLine("Get the type back from the handle...");
        Console.WriteLine("Type.GetTypeFromHandle(myRTHFromType):  {0}",
            Type.GetTypeFromHandle(myRTHFromType));
    }
}

/* This code example produces output similar to the following:

myRTHFromObject.Value:  799464
myRTHFromObject.GetType():  System.RuntimeTypeHandle
Get the type back from the handle...
Type.GetTypeFromHandle(myRTHFromObject):  MyClass1

myRTHFromObject.Equals(myRTHFromType):  True

myRTHFromType.Value:  799464
myRTHFromType.GetType():  System.RuntimeTypeHandle
Get the type back from the handle...
Type.GetTypeFromHandle(myRTHFromType):  MyClass1
 */

open System

type MyClass1() =
    let x = 0
    member _.MyMethod() =
        x

let myClass1 = MyClass1()

// Get the RuntimeTypeHandle from an object.
let myRTHFromObject = Type.GetTypeHandle myClass1
// Get the RuntimeTypeHandle from a type.
let myRTHFromType = typeof<MyClass1>.TypeHandle

printfn $"\nmyRTHFromObject.Value:  {myRTHFromObject.Value}"
printfn $"myRTHFromObject.GetType():  {myRTHFromObject.GetType()}"
printfn "Get the type back from the handle..."
printfn $"Type.GetTypeFromHandle(myRTHFromObject):  {Type.GetTypeFromHandle myRTHFromObject}"

printfn $"\nmyRTHFromObject.Equals(myRTHFromType):  {myRTHFromObject.Equals myRTHFromType}"

printfn $"\nmyRTHFromType.Value:  {myRTHFromType.Value}"
printfn $"myRTHFromType.GetType():  {myRTHFromType.GetType()}"
printfn "Get the type back from the handle..."
printfn $"Type.GetTypeFromHandle(myRTHFromType):  {Type.GetTypeFromHandle myRTHFromType}"

// This code example produces output similar to the following:
//     myRTHFromObject.Value:  799464
//     myRTHFromObject.GetType():  System.RuntimeTypeHandle
//     Get the type back from the handle...
//     Type.GetTypeFromHandle(myRTHFromObject):  MyClass1
//    
//     myRTHFromObject.Equals(myRTHFromType):  True
//    
//     myRTHFromType.Value:  799464
//     myRTHFromType.GetType():  System.RuntimeTypeHandle
//     Get the type back from the handle...
//     Type.GetTypeFromHandle(myRTHFromType):  MyClass1

Imports System.Reflection

Public Class MyClass1
    Private x As Integer = 0
   
    Public Function MyMethod() As Integer
        Return x
    End Function 'MyMethod
End Class 

Public Class MyClass2
   
    Public Shared Sub Main()
        Dim myClass1 As New MyClass1()
      
        ' Get the RuntimeTypeHandle from an object.
        Dim myRTHFromObject As RuntimeTypeHandle = Type.GetTypeHandle(myClass1)
        ' Get the RuntimeTypeHandle from a type.
        Dim myRTHFromType As RuntimeTypeHandle = GetType(MyClass1).TypeHandle
      
        Console.WriteLine(vbLf & "myRTHFromObject.Value:  {0}", _
            myRTHFromObject.Value)
        Console.WriteLine("myRTHFromObject.GetType():  {0}", _
            myRTHFromObject.GetType())
        Console.WriteLine("Get the type back from the handle...")
        Console.WriteLine("Type.GetTypeFromHandle(myRTHFromObject):  {0}", _
            Type.GetTypeFromHandle(myRTHFromObject))

        Console.WriteLine(vbLf & "myRTHFromObject.Equals(myRTHFromType):  {0}", _
            myRTHFromObject.Equals(myRTHFromType))

        Console.WriteLine(vbLf & "myRTHFromType.Value:  {0}", _
            myRTHFromType.Value)
        Console.WriteLine("myRTHFromType.GetType():  {0}", _
            myRTHFromType.GetType())
        Console.WriteLine("Get the type back from the handle...")
        Console.WriteLine("Type.GetTypeFromHandle(myRTHFromType):  {0}", _
            Type.GetTypeFromHandle(myRTHFromType))
    End Sub 
End Class 

' This code example produces output similar to the following:
'
'myRTHFromObject.Value:  7549720
'myRTHFromObject.GetType():  System.RuntimeTypeHandle
'Get the type back from the handle...
'Type.GetTypeFromHandle(myRTHFromObject):  MyClass1
'
'myRTHFromObject.Equals(myRTHFromType):  True
'
'myRTHFromType.Value:  7549720
'myRTHFromType.GetType():  System.RuntimeTypeHandle
'Get the type back from the handle...
'Type.GetTypeFromHandle(myRTHFromType):  MyClass1

Remarks

The handles are valid only in the application domain in which they were obtained.

Applies to

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