GCHandle.Alloc Method (Object)


Allocates a Normal handle for the specified object.

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

static member Alloc : 
        value:Object -> GCHandle


Type: System.Object

The object that uses the GCHandle.

Return Value

Type: System.Runtime.InteropServices.GCHandle

A new GCHandle that protects the object from garbage collection. This GCHandle must be released with Free when it is no longer needed.

Exception Condition

An instance with nonprimitive (non-blittable) members cannot be pinned.

Normal handles are opaque, which means that you cannot resolve the address of the object it contains through the handle.

The following example shows an App class that creates a handle to a managed object using the GCHandle.Alloc method, which prevents the managed object from being collected. A call to the EnumWindows method passes a delegate and a managed object (both declared as managed types, but not shown), and casts the handle to an IntPtr. The unmanaged function passes the type back to the caller as a parameter of the callback function.

No code example is currently available or this language may not be supported.


requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

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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