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
public boolean SetLastError
public var SetLastError : boolean

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

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.

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

Windows 98, Windows 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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