（即显示文字的同时不影响下面窗口的操作） //加入WS_EX_TRANSPARENT扩展属性
ModifyStyleEx(WS_EX_APPWINDOW,WS_EX_TRANSPARENT);
//加入WS_EX_LAYERED扩展属性
ModifyStyleEx(WS_EX_APPWINDOW,GetWindowLong(this->GetSafeHwnd(),GWL_EXSTYLE)^0x80000);
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
把窗体的FormBorderStyle设为
FormBorderStyle.None
using System.Runtime.InteropServices;
private const uint WS_EX_LAYERED = 0x80000;
private const int WS_EX_TRANSPARENT = 0x20;
private const int GWL_STYLE = (-16);
private const int GWL_EXSTYLE = (-20);
private const int LWA_ALPHA = 0x2;//
设置透明度
[DllImport("user32", EntryPoint = "SetWindowLong")]
private static extern uint SetWindowLong(
IntPtr hwnd,
int nIndex,
uint dwNewLong
);
[DllImport("user32", EntryPoint = "GetWindowLong")]
private static extern uint GetWindowLong(
IntPtr hwnd,
int nIndex
);
[DllImport("user32", EntryPoint = "SetLayeredWindowAttributes")]
private static extern int SetLayeredWindowAttributes(
IntPtr hwnd,
int crKey,
int bAlpha,
int dwFlags
);
/// <summary>
///
使窗口有鼠标穿透功能
/// </summary>
public void CanPenetrate()
{
uint intExTemp = GetWindowLong(this.Handle, GWL_EXSTYLE);
uint oldGWLEx = SetWindowLong(this.Handle, GWL_EXSTYLE, WS_EX_TRANSPARENT | WS_EX_LAYERED);
SetLayeredWindowAttributes(this.Handle, 0, 100, LWA_ALPHA);
}
要时窗体恢复正常，只要执行以下语句：
this.FormBorderStyle = FormBorderStyle.None;