如何在编辑后将图片框控件保存为jpeg文件

Question

PictureBox我的Windows窗体应用程序上有一个.

我在其中加载了一张图片,并Paint在代码中启用了该事件.它绘制一个矩形.

像这样:

private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
    Graphics gr = e.Graphics;
    Pen p = new Pen(Color.Red);
    p.Width = 5.0f;
    gr.DrawRectangle(p, 1, 2, 30, 40);
}

然后我点击"保存"按钮:

private void button2_Click(object sender, EventArgs e)
{
    pictureBox1.Image.Save(@"C:\Documents and Settings\tr1g3800\Desktop\WALKING\30P\100000test.jpg",ImageFormat.Jpeg);
}

但是保存的文件永远不会包含我绘制的矩形.

有谁有想法吗？

Answer 1

谢谢.你们的帮助都很有帮助.这很有效

        private void button1_Click(object sender, EventArgs e)
    {
        pictureBox1.ImageLocation=@"C:\Documents and Settings\tr1g3800\Desktop\WALKING\30P\100000.jpg" ;
    }

    private void button2_Click(object sender, EventArgs e)
    {
        pictureBox1.Image.Save(@"C:\Documents and Settings\tr1g3800\Desktop\WALKING\30P\100000test.jpg",ImageFormat.Jpeg);
    }

    private void pictureBox1_Paint(object sender, PaintEventArgs e)
    {

    }

    private void button3_Click(object sender, EventArgs e)
    {
        Bitmap bmp = new Bitmap(pictureBox1.Image);
        Graphics gr = Graphics.FromImage(bmp);
        Pen p = new Pen(Color.Red);
        p.Width = 5.0f;
        gr.DrawRectangle(p, 1, 2, 30, 40);
        pictureBox1.Image = bmp;
    }

Answer 2

您可能不应该直接在PictureBox上绘图.

您需要使用位图.尝试将位图放在PictureBox.Image中,然后调用Save().

请查看此内容以获取更多详