RuntimeHelpers.GetObjectValue Method (Object)


Boxes a value type.

Namespace:   System.Runtime.CompilerServices
Assembly:  mscorlib (in mscorlib.dll)

public static object GetObjectValue(
	object obj


Type: System.Object

The value type to be boxed.

Return Value

Type: System.Object

A boxed copy of obj if it is a value class; otherwise, obj itself.

Boxing a value type creates an object and performs a shallow copy of the fields of the specified value type into the new object.

This method allows a value class to be manipulated as an object while it retains the aliasing behavior of a value class.

The return value depends on whether the value class is mutable or immutable:

  • If the value being assigned is a mutable value class, the method returns a shallow copy of the class, because value classes have copy semantics.

  • If the value being assigned is an immutable value class, the method returns the object itself, instead of a copy of the class.

Compilers of dynamically typed languages can use this method to make sure that boxed value types work identically to unboxed value types. That is, boxed value types get cloned when you pass them around, and they are always passed by value. The compiler can call GetObjectValue to assign a value type to an object or to pass a value type as a parameter of a type object.

This method is used by compilers.

The following example demonstrates how to box a value class by using the GetObjectValue method.

using System;
using System.Runtime.CompilerServices;

// Declare a value type.
struct Point2I
    public int x;
    public int y;

class Program

    static void Main(string[] args)
        // Allocate an unboxed Point2I (not on the heap).
        Point2I pnt;
        pnt.x = 0;
        pnt.y = 0;

        // Box the value.  (Put it in the heap.)
        object objPntr = RuntimeHelpers.GetObjectValue(pnt);


Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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