沒有錯誤訊息 但是form裡面沒有圖 做了picturebox之後也沒有 有設point 畫筆也有顏色+有粗度 不知道是哪個步驟弄錯了 QQ 程式碼在下面 因為試了很多方式 所以有點亂 請幫我看一下 謝謝 using System.Drawing; public partial class Form1 : Form { Point p1 = new Point(400, 400); Point p2 = new Point(50, 50); Point[] p3 = new Point[4]; Color c1 = Color.Red; Pen pe1 = new Pen(Color.Red, 3); private Graphics g2; private Point point1; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { button1.BackColor = c1; pe1.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash; p3[0] = new Point(0, 0); p3[1] = new Point(0, 120); p3[2] = new Point(20, 120); p3[3] = new Point(20, 0); } private void button1_Click(object sender, EventArgs e) { System.Console.WriteLine("X: " + p1.X + ", Y: " + p1.Y); Graphics g1 = pictureBox1.CreateGraphics(); g1.DrawLine(pe1, p1, p2); g1.DrawLines(pe1, p3); } private void pictureBox1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e) { if (e.Button == MouseButtons.Left) { Pen pen = new Pen(Color.Black, 1); Point point2 = new Point(e.X, e.Y); g2.DrawLine(pen, point1, point2); point1 = new Point(e.X, e.Y); } } private void pictureBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) { g2 = pictureBox1.CreateGraphics(); point1 = new Point(e.X, e.Y); } } -- ◤ __ ＼__◣ ◢◤◢◤ ψhirabbitt ◢ ◤ ◢███◣ ◢███◣ 黑兔子我啊 █████ █████ 所以所以 ██●█● █▇███ 最喜歡白兔子了 ██╱╲ ●◥█████◣● 我們要一直在一起喔 ◥╱█╱╱ ● ◥████ ˇ --

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