Export (0) Print
Expand All

DllImportAttribute.ExactSpelling Field

Controls whether the DllImportAttribute.CharSet field causes the common language runtime to search an unmanaged DLL for entry-point names other than the one specified.

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

public bool ExactSpelling
public boolean ExactSpelling
public var ExactSpelling : boolean

If false, the entry point name appended with the letter A is invoked when the DllImportAttribute.CharSet field is set to CharSet.Ansi, and the entry-point name appended with the letter W is invoked when the DllImportAttribute.CharSet field is set to the CharSet.Unicode. Typically, managed compilers set this field.

The following table shows the relationship between the CharSet and ExactSpelling fields, based on default values imposed by the programming language. You can override the default setting, but do so with caution.

Language

ANSI

Unicode

Auto

Visual Basic

ExactSpelling:=True

ExactSpelling:=True

ExactSpelling:=False

C#

ExactSpelling=false

ExactSpelling=false

ExactSpelling=false

C++

ExactSpelling=false

ExactSpelling=false

ExactSpelling=false

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 ExactSpelling field is one of those cases.

using System.Runtime.InteropServices;
 public class Win32 {
     [DllImport("user32.dll", CharSet=CharSet.Unicode, 
                ExactSpelling=true)]
     public static extern int MessageBoxW(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

Community Additions

ADD
Show:
© 2014 Microsoft