Print range not working even if values are set

问题:

I have a simple printing solution set up and normal printing works fine(tested it a couple of times), however when I use the PrintDialog to specify a custom page range, it is as if the range is ingored. When I debug I inspect the printDocument object and confirm that the range values are correct but the end product that the printer produces does not much the values I gave it.

Here is my code :

            printDialog.Document = printdoc;
            printDialog.AllowSomePages = true;

            if (printDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                printdoc.PrinterSettings.FromPage = printDialog.PrinterSettings.FromPage;
                printdoc.PrinterSettings.ToPage = printDialog.PrinterSettings.ToPage;
                printdoc.PrinterSettings.PrintRange = printDialog.PrinterSettings.PrintRange;

                printPreviewDialog.Document = printdoc;
                printPreviewDialog.FindForm().WindowState = FormWindowState.Maximized;
                printPreviewDialog.ShowDialog();
            }

*Note - printdoc is a instance of System.Drawing.Printing.PrintDocument. I added code in the PrintDocument's PrintPage event handler to populate the page I'm printing.

回答1:

You need to tell the print dialog that it should accept user input for page ranges. To do this, you can specify the PrinterSettings.PrintRange.

var printDialog = new PrintDialog();
printDialog.AllowSomePages = true; //May not be needed
printDialog.PrinterSettings.PrintRange = PrintRange.SomePages; //Needed
if(printDialog.ShowDialog() == DialogResult.OK)
{
    // ... do the rest here
}

Notes: The main takeaway you should get is that you need to set PrintDialog.AllowSomePages = true (along with From/ToPage) in order to tell the dialog to only print those ranges. Also, I am not sure if setting the AllowSomePages after the dialog closes will take effect, so that's why I put the code before ShowDialog. You can try to set it inside the if-statement at your convenience.