你寻求的并不简单，因为边界是由操作系统绘制的。 但是，CodePlex上有一个库可以做到这一点。

在Windows窗体中绘制自定义边框

首先在InitializeComponent（）中写这个：

public const int WM_NCLBUTTONDOWN = 0xA1; public const int HT_RIGHT = 0xB; this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None; [DllImport("user32.dll")] public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam); [DllImport("user32.dll")] public static extern bool ReleaseCapture(); this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Resize_Form); 

然后，使用与此类似的方法。 在这种情况下，我的表单只能从右侧resize，但应该很容易从任何一侧resize：

  private void Resize_Form(object sender, MouseEventArgs e) { if ((e.Button == MouseButtons.Left) && (MousePosition.X >= this.Location.X + formWidth - 10)) { System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.SizeWE; ReleaseCapture(); SendMessage(Handle, WM_NCLBUTTONDOWN, HT_RIGHT, 0); formWidth = this.Width; } } 

我不认为有直接的方法来做到这一点。

但是，您可以将表单边框样式设置为“无”。 并在您的表单中实现resize（我认为这很难）

 string position = String.Empty; Point mouseDownPosition = new Point(); private void myForm_MouseDown(object sender, MouseEventArgs e) { position = (eX == 0) ? "Left" : ((eX == myForm.Width) ? "Right" : String.Empty; position += (eY == 0) ? "Top" : ((eY == myForm.Height) ? "Bottom" : String.Empty; if(position != String.Empty) { mouseDownPosition = e.Location; } } private void myForm_MouseMove(object sender, MouseEventArgs e) { if(position != String.Empty) { Point movementOffset = new Point(e.Location.X - mouseDownPosition.X, e.Location.Y - mouseDownPosition.Y); Switch(position) { Case "LeftTop": myForm.Location.X += movementOffset.X; myForm.Location.Y += movementOffset.Y; myForm.Width -= movementOffset.X; myForm.Height -= movementOffset.Y; Case "Left": myForm.Location.X += movementOffset.X; myForm.Width -= movementOffset.X; // Complete the remaining please :) } } } private void myForm_MouseUp(object sender, MouseEventArgs e) { position = String.Empty; } 

PS：尚未测试过

希望你将FormBorderStyle设置为None

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