C# 如何使用PictureBoxizeMode.Zoom绘制图像

在我的应用程序中，我需要打印员工照片作为身份证。我使用了图片框控件和sizemode作为PictureBoxSizeMode.StretchImage。 打印时，照片会根据图片框的宽度和高度变宽。但是这张照片看起来不像是原作。 当我将sizemode设置为PictureBoxSizeMode时，它就完美了。放大设计器窗口。但在打印时，结果将与以前相同。没有效果

PictureBox pict = (PictureBox)ctrl;
pict.SizeMode = PictureBoxSizeMode.Zoom;
RectangleF rect = new RectangleF(pict.Location.X, pict.Location.Y, pict.Width, pict.Height);
e.Graphics.DrawImage(pict.Image, rect);

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触发PrintPage事件时将执行上述代码

我想在单击打印按钮之前，您可以尝试在

缩放

模式下捕获

PictureBox

的位图，如下所示：

//The Rectangle (corresponds to the PictureBox.ClientRectangle)
//we use here is the Form.ClientRectangle
//Here is the Paint event handler of your Form1
private void Form1_Paint(object sender, EventArgs e){
  ZoomDrawImage(e.Graphics, yourImage, ClientRectangle);
}
//use this method to draw the image like as the zooming feature of PictureBox
private void ZoomDrawImage(Graphics g, Image img, Rectangle bounds){
  decimal r1 = (decimal) img.Width/img.Height;
  decimal r2 = (decimal) bounds.Width/bounds.Height;
  int w = bounds.Width;
  int h = bounds.Height;
  if(r1 > r2){
    w = bounds.Width;
    h = (int) (w / r1);
  } else if(r1 < r2){
    h = bounds.Height;
    w = (int) (r1 * h);
  }
  int x = (bounds.Width - w)/2;
  int y = (bounds.Height - h)/2;
  g.DrawImage(img, new Rectangle(x,y,w,h));
}

PictureBox pict = (PictureBox)ctrl;
pict.SizeMode = PictureBoxSizeMode.Zoom;
var bm = new Bitmap(pict.ClientSize.Width, pict.ClientSize.Height);
pict.DrawToBitmap(bm, pict.ClientRectangle);
e.Graphics.DrawImage(bm, pict.Bounds);

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抱歉，但我已经意识到此代码与我之前（不久前）在回答中发布的代码非常相似？@King-它违反了此网站的许可条款。你可能需要解释一下。要求是指向原始帖子的链接以及指向该帖子作者简介的链接。SizeMode完全不影响图像，只影响PictureBox用于绘制图像的Graphics.DrawImage（）调用。您必须在自己的代码中复制这些内容。否则，使用Graphics.ScaleTransform（）很容易

PictureBox pict = (PictureBox)ctrl;
pict.SizeMode = PictureBoxSizeMode.Zoom;
var bm = new Bitmap(pict.ClientSize.Width, pict.ClientSize.Height);
pict.DrawToBitmap(bm, pict.ClientRectangle);
e.Graphics.DrawImage(bm, pict.Bounds);