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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)

public:
static GCHandle Alloc (
	Object^ value
)
public static GCHandle Alloc (
	Object value
)
public static function Alloc (
	value : Object
) : GCHandle
Not applicable.

Parameters

value

The object that uses the GCHandle.

Return Value

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

Exception typeCondition

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.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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