Question

Windows应用程序在标题栏的左上角有一个图标，位于应用程序名称的左侧？如果您点击它，它会有Restore，Minimize，Maximize等选项。

在许多程序中，它们都有其他菜单选项（超出Windows提供的默认选项）。如何在C＃Winforms中实现它？

Answer 1

“自定义Windows窗体应用程序中的系统菜单”教程：

http://www.codeproject.com/KB/dotnet/CustomWinFormSysMenu.aspx

http://www.codeguru.com/csharp/csharp/cs_misc/userinterface/article.php/c9327

段：

导入user32.dll以访问更改系统菜单所需的功能。

[DllImport("user32.dll")]
private static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);
[DllImport("user32.dll")]
private static extern bool InsertMenu (IntPtr hMenu, 
    Int32 wPosition, Int32 wFlags, Int32 wIDNewItem, 
    string lpNewItem);

获取当前系统菜单，并向其中添加项目：

IntPtr sysMenuHandle = GetSystemMenu(this.Handle, false);
//It would be better to find the position at run time of the 'Close' item, but...

InsertMenu(sysMenuHandle, 5, MF_BYPOSITION | MF_SEPARATOR, 0, string.Empty);
InsertMenu(sysMenuHandle, 6, MF_BYPOSITION , IDM_CUSTOMITEM1, "Item 1");
InsertMenu(sysMenuHandle, 7, MF_BYPOSITION , IDM_CUSTOMITEM2, "Item 2");

public const Int32 WM_SYSCOMMAND = 0x112;
public const Int32 MF_SEPARATOR = 0x800;
public const Int32 MF_BYPOSITION = 0x400;
public const Int32 MF_STRING = 0x0;
public const Int32 IDM_CUSTOMITEM1  = 1000;
public const Int32 IDM_CUSTOMITEM2 = 1001;

捕获新自定义项目的选择，以便为它们分配方法：

protected override void WndProc(ref Message m)
{
    if(m.Msg == WM_SYSCOMMAND)
    {
        switch(m.WParam.ToInt32())
        {
            case IDM_CUSTOMITEM1 : 
                MessageBox.Show("Clicked 'Item 1'");
                return;
            case IDM_CUSTOMITEM1 :
                MessageBox.Show("Clicked 'item 2'");
                return;
            default:
                break;
        } 
    }
    base.WndProc(ref m);
}

将菜单选项插入ApplicationIcon菜单

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