When inheriting from System.Drawing.Printing.PrintDocument is there a way to get the page margin bound before the OnPrintPage event?

 

I'm only able to get it from the OnPrintPage event but this is being called for every pages and I would like to initialize my image before the first page is being called.

 

The ideal place would be in the OnBeginPrint event.

Technically you can't, the QueryPageSettings event allows the client to change the page settings for each individual page. If you have to disallow this then just lazily initialize your images on the first invocation of OnPrintPage:

using System;
using System.Drawing;
using System.Drawing.Printing;

class MyDocument : PrintDocument {
bool mInitialized;
Rectangle mPageBounds;

private void InitializeImages(Rectangle bounds) {
// etc..
}
protected override void OnBeginPrint(PrintEventArgs e) {
mInitialized = false;
base.OnBeginPrint(e);
}
protected override void OnPrintPage(PrintPageEventArgs e) {
if (!mInitialized) {
mInitialized = true;
mPageBounds = e.PageBounds;
InitializeImages(e.PageBounds);
}
else {
if (e.PageBounds != mPageBounds) throw new InvalidOperationException("Page bounds have changed");
}
base.OnPrintPage(e);
}
}

---

Hans Passant.

Private Function GatherDefaultMarginBounds() As Rectangle
Dim oMargins As Margins = Me.DefaultPageSettings.Margins
Dim oPageBounds As Rectangle = Me.DefaultPageSettings.Bounds
Return Rectangle.FromLTRB(oMargins.Left, oMargins.Top, oPageBounds.Right - oMargins.Right, oPageBounds.Bottom - oMargins.Bottom)
End Function

Technically you can't, the QueryPageSettings event allows the client to change the page settings for each individual page. If you have to disallow this then just lazily initialize your images on the first invocation of OnPrintPage:

using System;
using System.Drawing;
using System.Drawing.Printing;

class MyDocument : PrintDocument {
bool mInitialized;
Rectangle mPageBounds;

private void InitializeImages(Rectangle bounds) {
// etc..
}
protected override void OnBeginPrint(PrintEventArgs e) {
mInitialized = false;
base.OnBeginPrint(e);
}
protected override void OnPrintPage(PrintPageEventArgs e) {
if (!mInitialized) {
mInitialized = true;
mPageBounds = e.PageBounds;
InitializeImages(e.PageBounds);
}
else {
if (e.PageBounds != mPageBounds) throw new InvalidOperationException("Page bounds have changed");
}
base.OnPrintPage(e);
}
}

---

Hans Passant.