c# - 我有要在纸张尺寸** 4英寸乘6英寸**上打印的WPF窗口

我有一个WPF窗口，我想用4英寸乘6英寸的纸张打印。
我不知道在哪里定这个尺寸？是吗？
我正在使用窗口大小打印，但窗口大小不起作用。
我的打印机不是固定的纸张大小。
这是我的打印代码：

private void _print()
    {
        PrintDialog printDlg = new System.Windows.Controls.PrintDialog();
        //printDlg.ShowDialog();
        //get selected printer capabilities
        System.Printing.PrintCapabilities capabilities = printDlg.PrintQueue.GetPrintCapabilities(printDlg.PrintTicket);

        //get scale of the print wrt to screen of WPF visual
        double scale = Math.Min(capabilities.PageImageableArea.ExtentWidth / this.ActualWidth, capabilities.PageImageableArea.ExtentHeight /
                       this.ActualHeight);

        //Transform the Visual to scale
        this.LayoutTransform = new ScaleTransform(scale, scale);

        //get the size of the printer page
        Size sz = new Size(this.ActualWidth, this.ActualHeight);

        //update the layout of the visual to the printer page size.
        this.Measure(sz);
        this.Arrange(new Rect(new Point(capabilities.PageImageableArea.OriginWidth,  capabilities.PageImageableArea.OriginHeight), sz));

        //now print the visual to printer to fit on the one page.
        printDlg.PrintVisual(this, "Print Page");
    }

最佳答案

在wpf1 unit = 1/96 of inch中，因此可以使用此公式计算以英寸为单位的尺寸
您可以将printDlg.PrintTicket.PageMediaSize设置为纸张大小，然后将窗口转换为在该区域打印，如下所示：

 private void _print()
 {
      PrintDialog printDlg = new System.Windows.Controls.PrintDialog();

       PrintTicket pt = printDlg.PrintTicket;
       Double printableWidth = pt.PageMediaSize.Width.Value;
       Double printableHeight = pt.PageMediaSize.Height.Value;

       Double xScale = (printableWidth - xMargin * 2) / printableWidth;
       Double yScale = (printableHeight - yMargin * 2) / printableHeight;


        this.Transform = new MatrixTransform(xScale, 0, 0, yScale, xMargin, yMargin);


    //now print the visual to printer to fit on the one page.
     printDlg.PrintVisual(this, "Print Page");
}