求救：c#中picturebox中用graphics画的图怎么保存成图片出来啊

[tjuzm]

c#中picturebox中用graphics画的图怎么保存成图片出来啊

[LorenLiu]

调用pictureBox的DrawToBitmap方法就可以了

[bdmh]

            Bitmap bmp = new Bitmap(pictureBox1.BackgroundImage);
            bmp.Save("c:\\1.bmp");

[tjuzm]

你能说详细点么，我还没明白，我在picturebox中有一张图片，现在我在图片上画个正方形，然后将图片和正方形都一起保存为bmp图片存在磁盘上，谢谢

[打转的风铃]

我会，呵呵，做过!!!

 bmp.Save("C:/1.bmp", System.Drawing.Imaging.ImageFormat.Bmp);
                

[LorenLiu]

就是把pictureBox的内容都画到一个Bitmap对象上，然后保存Bitmap

Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox.Height);
pictureBox1.DrawToBitmap(bmp, new Rectangle(0, 0, bmp.Width, bmp.Height));
bmp.Save("C:\\1.bmp");

[打转的风铃]

就用我说的那个，肯定没错，呵呵，我就是这么用的！：）

[tjuzm]

怎么还是不行啊，我把代码发上去你们看看，谢谢
private void button3_Click(object sender, EventArgs e)
{
Graphics g;
g = this.pictureBox1.CreateGraphics();
g.DrawLine(new Pen(Color.Blue, 10), 100, 100, 0, 0);
Rectangle m=new Rectangle(0,0,pictureBox1.Width,pictureBox1.Height);
Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
pictureBox1.DrawToBitmap(bmp, m);

bmp.Save("f://1.bmp", System.Drawing.Imaging.ImageFormat.Bmp);
}

[LorenLiu]

[Quote=引用 7 楼 tjuzm 的回复:]
怎么还是不行啊，我把代码发上去你们看看，谢谢
private void button3_Click(object sender, EventArgs e)
{
Graphics g;
g = this.pictureBox1.CreateGraphics();
g.DrawLine(new Pen(Color.Blue, 10), 100, 100, 0, 0);
……
[/Quote]

为什么要用这种方法来画线而不是在paint方法里做呢？

[tjuzm]

我知道了，好像是graphics在picturebox上画图不是在picturebox上的图片上画，而是在电脑屏幕上画
private void button3_Click(object sender, EventArgs e)
{
Graphics g;
Pen pen=new Pen(Color.Red,5);
Bitmap bmp = new Bitmap(pictureBox1.Image);
g = Graphics.FromImage((Image)bmp);
g.DrawRectangle(pen, 0, 0, 100,100);
pictureBox1.Image = (Image)bmp;
saveFileDialog1.Title = "save the pictrue";
saveFileDialog1.Filter = "jpg图片(*.jpg)|*.jpg|bmp图片(*.bmp)|*.bmp";
saveFileDialog1.InitialDirectory = "f:\\";

if ((saveFileDialog1.FileName != null) && (saveFileDialog1.ShowDialog()== DialogResult.OK))
{
pictureBox1.Image.Save(saveFileDialog1.FileName);
}
else
{
return;

}

}

[LorenLiu]

额。。这样也行吧。。我个人不太习惯这种写法。。。

[spmzfz]

参考这个：
pictureBox1.Image = Image.FromFile("pic.jpg");
Graphics G = Graphics.FromImage(pictureBox1.Image);
G.DrawString("Lucky", new Font("楷体", 16F), new SolidBrush(Color.Red), new PointF(0, 0));
pictureBox1.Image.Save("d:\\temp.jpg");
G.Dispose();

[wgc]

        private void button1_Click(object sender, EventArgs e)
        {
            Bitmap bmp = new Bitmap(pictureBox1.Image,pictureBox1.Width,pictureBox1.Height);
            Graphics g = Graphics.FromImage(bmp);
            g.DrawLine(new Pen(Color.Blue, 10), 100, 100, 0, 0);
            bmp.Save("d://1.bmp", System.Drawing.Imaging.ImageFormat.Bmp);
        }

[qq2013]

Bitmap bmp = new Bitmap(pictureBox1.Image,pictureBox1.Width,pictureBox1.Height);
Graphics g = Graphics.FromImage(bmp);
g.DrawLine(new Pen(Color.Blue, 10), 100, 100, 0, 0);
bmp.Save("d://1.bmp", System.Drawing.Imaging.ImageFormat.Bmp);

[kiddc]

好像pictureBox的paint会在你画完之后又载入原来的那张图，所以好像没画出来。
如果你画图的代码不写在“画图的事件”里面，那么最好把你save的图再度载入pictureBox1，类似这样
this.pictureBox1.ImageLocation = "e:\\XXX.jpg";
this.pictureBox1.Image = Image.FromFile(this.pictureBox1.ImageLocation);