Rectangle rect = new Rectangle(); rect = Screen.GetWorkingArea(this); this.Width = rect.Width;//屏幕宽 this.Height = rect.Height;//屏幕高 this.ControlBox = false; // 设置不出现关闭按钮 this.FormBorderStyle = FormBorderStyle.None;//无边框
C# WinForm 技巧十: winfrom 全屏自适应屏幕分辨率
原文：https://www.cnblogs.com/luomingui/p/9598447.html