打印页绘制字符串不显示 C#

Question

所以我试图在PrintDocument的PrintPage事件中循环绘制一个字符串：

for (int c = 0; c < currentwords; c++)
{
    // index is a global int that starts at 0 and f9 is a font with size 9
    ev.Graphics.DrawString(allitems[index], f9, Brushes.Black, new Point(100, 100));
    // I used new Point(100, 100) for debugging purposes but normally I would
    // do some calculating to see where it is to be printed
    index++;
}

这似乎一切正常，调试器显示当我使用断点时它会运行，但是当我在PrintPreviewDialog中显示文档时，它没有显示。 allitems[index]确实包含一个值，我不确定为什么它不显示。我正在循环外打印其他字符串和矩形，它们显示在对话框中。如果有人可以帮助我，请在这里发布，谢谢！

编辑：

以下是图形模式/渲染提示：

ev.Graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
ev.Graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
ev.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
ev.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
ev.Graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;

编辑 2：

好的，所以我使用了：

ev.Graphics.DrawString(allitems[0], f9, Brushes.Black, new Point(100, 100));
for (int c = 0; c < currentwords; c++)
{
    // index is a global int that starts at 0 and f9 is a font with size 9
    ev.Graphics.DrawString(allitems[index], f9, Brushes.Black, new Point(100, 100));
    // I used new Point(100, 100) for debugging purposes but normally I would
    // do some calculating to see where it is to be printed
    index++;
}

并且只显示循环外的DrawString，但循环应该工作并且代码正在运行。

Answer 1

所以我发现问题是如果我在 for 循环中多次绘制，如下所示：

for (int c = 0; c < currentwords; c++)
{
    ev.Graphics.DrawString(allitems[index], f9, Brushes.Black, 100, 100);
    ev.Graphics.DrawString(allqty[index], f9, Brushes.Black, new Point(200, 200);
    ev.Graphics.DrawString((allprices[index].Contains('$')) ? allprices[index] : "$" + allprices[index], f9, Brushes.Black, 300, 300);
}

它根本不会显示其中任何一个。要解决此问题，我必须将每个DrawString方法放在不同的循环中，不确定为什么它在其他方面不起作用。

Answer 2

Chaneg 将循环控制变量转换为"index"。您的错误在于您没有为循环使用循环控制变量。