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Marshal.DestroyStructure(T) Method (IntPtr)

[Supported in the .NET Framework 4.5.1 and later versions]

Frees all substructures of a specified type that the specified unmanaged memory block points to.

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

static member DestroyStructure : 
        ptr:IntPtr -> unit

Type Parameters


The type of the formatted structure. This provides the layout information necessary to delete the buffer in the ptr parameter.


Type: System.IntPtr

A pointer to an unmanaged block of memory.


T has an automatic layout. Use sequential or explicit instead.

You can use this method to free reference type fields, such as strings, of an unmanaged structure. Unlike its fields, a structure can be a value type or a reference type. Value type structures that contain value type fields (all blittable) have no references whose memory must be freed. The Marshal.StructureToPtr method uses this method to prevent memory leaks when reusing memory occupied by a structure.

DestroyStructure calls the COM SysFreeString function, which, in turn, frees an allocated string.

.NET Framework

Supported in: 4.6, 4.5.1

Supported in: Windows Phone 8.1

  • SecurityCriticalAttribute 

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

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