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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 

Parameters

value
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.
ExceptionCondition
ArgumentException

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.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
  • SecurityCriticalAttribute 

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

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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