WinForm正在以比屏幕大的尺寸打开

您可以设置窗体的最小和最大大小,如下所示

this.MinimumSize = new Size(140, 480);
this.MaximumSize = new Size(140, 480);

private void Form1_Load(object sender, EventArgs e)
        {
            int h = Screen.PrimaryScreen.WorkingArea.Height;
            int w = Screen.PrimaryScreen.WorkingArea.Width;
            this.ClientSize = new Size(w, h);
        }

Rectangle screen = Screen.PrimaryScreen.WorkingArea;
int w = Width >= screen.Width ? screen.Width : (screen.Width + Width) / 2;
int h = Height >= screen.Height ? screen.Height : (screen.Height + Height) / 2;
this.Location = new Point((screen.Width - w) / 2, (screen.Height - h) / 2);
this.Size = new Size(w, h);