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。如果单击它,它会显示选项,如还原
、最小化
、最大化
等。
在许多程序中,它们在那里提供了其他菜单选项(超出Windows提供的默认选项)。如何在C# Winforms中实现这一点?
有关“在 Windows Forms 应用程序中自定义系统菜单”的教程:
http://www.codeproject.com/KB/dotnet/CustomWinFormSysMenu.aspx
http://www.codeguru.com/csharp/csharp/cs_misc/userinterface/article.php/c9327
代码片段:[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);
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;
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);
}