C# 制作透明窗体

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Runtime.InteropServices;

using ControlExs;

namespace TransForm

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();
//// 定义在窗体上，光标显示为手形

            this.Cursor = System.Windows.Forms.Cursors.Hand;

            //// 定义窗体的标题名称

            this.Text = "透明的WinForm窗体！";

            //// 定义窗体的开始显示位置是屏幕的中间

            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;

            //// 窗体的边界是Fixed3D类型

            //this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;

            ////以桌面的前景色作为窗体的前景色

            this.ForeColor = System.Drawing.SystemColors.Desktop;

            //// 定义字体类型，大小

            this.Font = new System.Drawing.Font("宋体", 9);

            //// 定义背景色为蓝色

            this.BackColor = System.Drawing.Color.White;

            // 设置窗体的大小

            //this.ClientSize = new System.Drawing.Size(440, 170);

            // Opacity属性设立窗体的透明程度，只对于视窗2000有效

            this.Opacity = 0.60;

        }
private void Form1_Load(object sender, EventArgs e)

        {

            this.SetWindowTransparent(100);

        }
private void SetWindowTransparent(byte bAlpha)

        {

            try

            {

                WinAPI.SetWindowLong(this.Handle, (int)WinAPI.WindowStyle.GWL_EXSTYLE, WinAPI.GetWindowLong(this.Handle, (int)WinAPI.WindowStyle.GWL_EXSTYLE) | (uint)WinAPI.ExWindowStyle.WS_EX_LAYERED);

                WinAPI.SetLayeredWindowAttributes(this.Handle, 0, bAlpha, WinAPI.LWA_COLORKEY | WinAPI.LWA_ALPHA);

            }

            catch

            {
}

        }
protected override CreateParams CreateParams

        {

            get

            {

                CreateParams cp = base.CreateParams;

                cp.Parent = WinAPI.GetDesktopWindow();

                cp.ExStyle = 0x00000080 | 0x00000008;  //WS_EX_TOOLWINDOW | WS_EX_TOPMOST

                return cp;

            }

        }

    }

}

 public class WinAPI

    {

        [DllImport("user32.dll")]

        public extern static IntPtr GetDesktopWindow();

[DllImport("user32.dll")]

        public extern static bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey, byte bAlpha, uint dwFlags);
public static uint LWA_COLORKEY = 0x00000001;

        public static uint LWA_ALPHA = 0x00000002;
[DllImport("user32.dll")]

        public extern static uint SetWindowLong(IntPtr hwnd, int nIndex, uint dwNewLong);
[DllImport("user32.dll")]

        public extern static uint GetWindowLong(IntPtr hwnd, int nIndex);
public enum WindowStyle : int { GWL_EXSTYLE = -20 }

        public enum ExWindowStyle : uint { WS_EX_LAYERED = 0x00080000 }

    }

C# 制作透明窗体,布布扣,bubuko.com