Question

c#语言，我想在窗体的一个Button事件调用画线的方法，调用成功了，怎么在窗体上显示出来？

private void Form1_Load(object sender, EventArgs e)
{
CreateLine(100,100);
}
private void CreateLine(int X, int Y)
{
Bitmap bt = new Bitmap(100, 100);
Graphics g =pictureBox1.CreateGraphics();
Pen p = new Pen(Color.Red, 1);
g.DrawLine(p, new Point(0,0), new Point(X, Y));
pictureBox1.Image = bt;
}
例如我这样的一个方法：
不行，你们说的都不行。。

Answer 1

private void Form1_Load(object sender, EventArgs e)
{
// CreateLine(100,100);
}
private void button1_Click(object sender, EventArgs e)
{
CreateLine(100,100);
}
private void CreateLine(int X, int Y)
{
Bitmap bt = new Bitmap(100, 100);
Graphics g =pictureBox1.CreateGraphics();
Pen p = new Pen(Color.Red, 1);
g.DrawLine(p, new Point(0,0), new Point(X, Y));
pictureBox1.Image = bt;
}

Answer 2

在button事件中调用就ok了

private void button1_Click(object sender, EventArgs e)
{
CreateLine(100,100);
}

Answer 3

自己就显示出来了啊

Answer 4

你画了他自己就会显示出来。