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DllImportAttribute.SetLastError Field

Indicates whether the callee calls the SetLastError Win32 API function before returning from the attributed method.

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

true to indicate that the callee will call SetLastError; otherwise, false. The default is false.

The runtime marshaler calls GetLastError and caches the value returned to prevent it from being overwritten by other API calls. You can retrieve the error code by calling GetLastWin32Error.

In some cases, Visual Basic developers use the DllImportAttribute, instead of using the Declare statement, to define a DLL function in managed code. Setting the SetLastError field is one of those cases.


public class Win32
{
    [DllImport("user32.dll", SetLastError=true)]
    public static extern int MessageBoxA(IntPtr hWnd, String text,
                                String caption, uint type);
}


.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

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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