關鍵代碼：

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設置窗體的FormBorderStyle為None，和TransparencyKey為Fuchsia(為圖片背景色)必須和圖片背景色一樣。是代碼：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;namespace WindowsFormsApplication1 {public partial class Form1 : Form{public Form1(){InitializeComponent();}private Point mouse_offset;private void Form1_MouseMove(object sender, MouseEventArgs e){if (e.Button == System.Windows.Forms.MouseButtons.Left){Point mousepos = Control.MousePosition;mousepos.Offset(mouse_offset.X,mouse_offset.Y);Location = mousepos;}}private void Form1_MouseDown(object sender, MouseEventArgs e){mouse_offset = new Point(-e.X,-e.Y);}} }

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轉載于:https://www.cnblogs.com/ryan-wan/archive/2012/07/16/2593936.html

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