打印.NET DataGridView

您好！您提到的问题是关于如何在 .NET 应用程序中打印 DataGridView 控件。以下是一些建议和代码示例，以帮助您实现这一目标。

1. 使用 PrintDocument 类

您可以使用 PrintDocument 类来实现 DataGridView 的打印功能。以下是一个简单的示例代码：

private void PrintDataGridView(DataGridView dgv)
{
    PrintDocument printDoc = new PrintDocument();
    printDoc.PrintPage += (sender, args) =>
    {
        int marginLeft = args.MarginBounds.Left;
        int marginTop = args.MarginBounds.Top;
        int marginRight = args.MarginBounds.Right;
        int marginBottom = args.MarginBounds.Bottom;

        // Calculate the total width of the columns
        int totalWidth = 0;
        foreach (DataGridViewColumn col in dgv.Columns)
        {
            totalWidth += col.Width;
        }

        // Calculate the ratio of the printable area width to the total width
        double ratio = args.MarginBounds.Width / (double)totalWidth;

        // Calculate the new width and height of the DataGridView
        int newWidth = (int)(dgv.Width * ratio);
        int newHeight = (int)(dgv.Height * ratio);

        // Create a new DataGridView to print
        DataGridView printDGV = new DataGridView();
        printDGV.ColumnHeadersHeight = dgv.ColumnHeadersHeight;
        printDGV.Columns.AddRange(dgv.Columns.ToArray());
        printDGV.Rows.AddRange(dgv.Rows.ToArray());
        printDGV.Size = new Size(newWidth, newHeight);

        // Calculate the number of pages
        int numPages = (int)Math.Ceiling((double)printDGV.Height / args.MarginBounds.Height);

        // Print each page
        for (int page = 0; page < numPages; page++)
        {
            // Create a new bitmap for the page
            Bitmap bm = new Bitmap(printDGV.Width, printDGV.Height);

            // Draw the DataGridView on the bitmap
            printDGV.DrawToBitmap(bm, new Rectangle(0, page * args.MarginBounds.Height, printDGV.Width, printDGV.Height));

            // Draw the bitmap on the printer graphics
            args.Graphics.DrawImage(bm, marginLeft, marginTop);

            // Move the margin top for the next page
            marginTop += args.MarginBounds.Height;

            // Invalidate the bitmap and the print preview
            bm.Dispose();
            args.HasMorePages = (page < numPages - 1);
        }
    };

    // Print the document
    printDoc.Print();
}

2. 使用 DataGridView 的内置打印功能

DataGridView 控件还提供了一些内置的打印功能，您可以直接调用这些方法来实现打印。以下是一个简单的示例代码：

private void PrintDataGridView(DataGridView dgv)
{
    PrintDialog printDialog = new PrintDialog();
    PrintDocument printDoc = dgv.PrintDocument;
    printDialog.Document = printDoc;

    // Set the print settings
    printDoc.DefaultPageSettings.Landscape = true;
    printDoc.DefaultPageSettings.Margins = new Margins(50, 50, 50, 50);

    // Show the print dialog and print the document
    if (printDialog.ShowDialog() == DialogResult.OK)
    {
        printDoc.Print();
    }
}

希望这些信息对您有所帮助！如果您有其他问题或需要更多详细信息，请随时告诉我。