Export (0) Print
Expand All

DllImportAttribute.EntryPoint Field

Indicates the name or ordinal of the DLL entry point to be called.

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

public string EntryPoint
public String EntryPoint
public var EntryPoint : String
Not applicable.

You can specify the entry-point name by supplying a string indicating the name of the DLL containing the entry point, or you can identify the entry point by its ordinal. Ordinals are prefixed with the # sign, for example, #1. If you omit this field, the common language runtime uses the name of the.NET method marked with the DllImportAttribute.

For additional information, see Identifying Functions in DLLs. For examples showing how to use the EntryPoint field, see Specifying an Entry Point.

The following code example shows how to use the DllImportAttribute attribute to import the Win32 MessageBox function. The code example uses the EntryPoint property to specify the function to import and then changes the name to MyNewMessageBoxMethod.

using System;
using System.Runtime.InteropServices;

class Example
{
    // Use DllImport to import the Win32 MessageBox function.
    // Specify the method to import using the EntryPoint field and 
    // then change the name to MyNewMessageBoxMethod.
    [DllImport("user32.dll", CharSet = CharSet.Auto, EntryPoint = "MessageBox")]
    public static extern int MyNewMessageBoxMethod(IntPtr hWnd, String text, String caption, uint type);
    
    static void Main()
    {
        // Call the MessageBox function using platform invoke.
        MyNewMessageBoxMethod(new IntPtr(0), "Hello World!", "Hello Dialog", 0);
    }
}

Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

Community Additions

ADD
Show:
© 2014 Microsoft