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Marshal.GetLastWin32Error Method

Returns the error code returned by the last unmanaged function that was called using platform invoke that has the DllImportAttribute.SetLastError flag set.

Namespace:  System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)
static member GetLastWin32Error : unit -> int

Return Value

Type: System.Int32
The last error code set by a call to the Win32 SetLastError function.

GetLastWin32Error exposes the Win32 GetLastError function from Kernel32.DLL. This method exists because it is not safe to make a direct platform invoke call to GetLastError to obtain this information. If you want to access this error code, you must call GetLastWin32Error instead of writing your own platform invoke definition for GetLastError and calling it. The common language runtime can make internal calls to APIs that overwrite the GetLastError maintained by the operating system.

You can use this method to obtain error codes only if you apply the System.Runtime.InteropServices.DllImportAttribute to the method signature and set the SetLastError field to true. The process for this varies depending upon the source language used: C# and C++ are false by default, but the Declare statement in Visual Basic is true.

The following example demonstrates calling the GetLastWin32Error method. The example first demonstrates calling the method with no error present and then demonstrates calling the method with an error present.

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

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1
  • SecurityCriticalAttribute 

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

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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