为什么我的图像不能打印到PrintDocument？

Question

我有“C：//”中名称为“1.bmp”，“2.bmp”，“3.bmp”等位图，我试图打印这些图像，但打印文档是空的图像是在正确的路径）

这里是我的代码：

private void button3_Click_1(object sender, EventArgs e) 
{ 
    PrintDocument pd = new PrintDocument(); 
    for (int indice = 0; indice < nPaginasPDF + 1; indice++) 
    { 
     pd.PrintPage += new PrintPageEventHandler(Print_Page); 
    } 
    PrintPreviewDialog dlg = new PrintPreviewDialog(); 

    dlg.Document = pd; 
    dlg.ShowDialog(); 
    pd.Print(); 
}  

private void Print_Page(object o, PrintPageEventArgs e) 
{ 
    nPaginasImpressas++; 
    System.Drawing.Image i = System.Drawing.Image.FromFile("C:\\" + nPaginasImpressas + ".bmp"); 
    Point p = new Point(891, 1350); 
    e.Graphics.DrawImage(i, p); 
} 

Answer 1

确定，因此通过页面的打印利用了PrintPageEventArgs类，并多次不重视该事件的过程。考虑以下代码：

private void button3_Click_1(object sender, EventArgs e) 
{ 
    PrintDocument pd = new PrintDocument(); 
    pd.PrintPage += new PrintPageEventHandler(Print_Page); 
    PrintPreviewDialog dlg = new PrintPreviewDialog(); 

    dlg.Document = pd; 
    dlg.ShowDialog(); 
    pd.Print(); 
}  

private void Print_Page(object o, PrintPageEventArgs e) 
{ 
    nPaginasImpressas++; 
    System.Drawing.Image i = System.Drawing.Image.FromFile("C:\\" + nPaginasImpressas + ".bmp"); 
    Point p = new Point(0, 0); 
    e.Graphics.DrawImage(i, p); 

    e.HasMorePages = File.Exists("C:\\" + (nPaginasImpressas + 1) + ".bmp"); 
} 

此代码应允许您打印多个页面。但请注意对Point的更改 - 这对我来说是相当可疑的，然后是HasMorePages的杠杆作用。