如何实现DataGridView多页打印？解决单页数据溢出问题

你当前的代码直接将整个DataGridView转为Bitmap缩印，既无法处理超出单页的内容，还通过e.HasMorePages = false强制关闭了多页打印。要实现正确的多页打印，需要逐行计算每页可容纳的内容，分批次绘制，并通过HasMorePages控制分页流程。

实现步骤与代码修改 #

1. 添加类级变量跟踪当前打印行索引
2. 在PrintPage事件中逐页绘制表头与数据行
3. 动态计算每页可打印行数，判断是否需要继续分页

完整代码如下：

// 类级变量，跟踪当前打印到第几行
private int currentPrintRow = 0;

private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
    // 获取打印区域的边界
    var printArea = e.MarginBounds;
    // 定义行高、表头高度（可根据实际调整）
    int rowHeight = dataGridView1.RowTemplate.Height;
    int headerHeight = dataGridView1.ColumnHeadersHeight;
    
    // 计算每页可打印的数据行数（减去表头占用的高度）
    int rowsPerPage = (printArea.Height - headerHeight) / rowHeight;
    if (rowsPerPage <= 0) rowsPerPage = 1;

    // 绘制表头
    DrawHeader(e.Graphics, printArea, headerHeight);

    // 绘制当前页的数据行
    int endRow = currentPrintRow + rowsPerPage;
    if (endRow > dataGridView1.Rows.Count) endRow = dataGridView1.Rows.Count;

    DrawDataRows(e.Graphics, printArea, headerHeight, rowHeight, currentPrintRow, endRow);

    // 更新当前行索引，判断是否还有更多页
    currentPrintRow = endRow;
    e.HasMorePages = currentPrintRow < dataGridView1.Rows.Count;
}

// 绘制表头方法
private void DrawHeader(Graphics g, Rectangle printArea, int headerHeight)
{
    float x = printArea.Left;
    float y = printArea.Top;

    // 绘制表头背景
    g.FillRectangle(Brushes.LightGray, new RectangleF(x, y, printArea.Width, headerHeight));

    // 绘制每列表头
    foreach (DataGridViewColumn col in dataGridView1.Columns)
    {
        if (!col.Visible) continue;
        
        // 绘制单元格边框
        g.DrawRectangle(Pens.Black, x, y, col.Width, headerHeight);
        // 绘制表头文本
        g.DrawString(col.HeaderText, dataGridView1.Font, Brushes.Black, 
            new RectangleF(x + 2, y + 2, col.Width - 4, headerHeight - 4), 
            new StringFormat { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center });
        
        x += col.Width;
    }
}

// 绘制数据行方法
private void DrawDataRows(Graphics g, Rectangle printArea, int headerHeight, int rowHeight, int startRow, int endRow)
{
    float y = printArea.Top + headerHeight;

    for (int i = startRow; i < endRow; i++)
    {
        DataGridViewRow row = dataGridView1.Rows[i];
        if (row.IsNewRow) continue;

        float x = printArea.Left;
        // 绘制行背景（交替行颜色）
        Brush rowBrush = (i % 2 == 0) ? Brushes.White : Brushes.LightBlue;
        g.FillRectangle(rowBrush, new RectangleF(x, y, printArea.Width, rowHeight));

        foreach (DataGridViewCell cell in row.Cells)
        {
            if (!cell.OwningColumn.Visible) continue;
            
            // 绘制单元格边框
            g.DrawRectangle(Pens.Black, x, y, cell.OwningColumn.Width, rowHeight);
            // 绘制单元格文本
            g.DrawString(cell.Value?.ToString() ?? "", dataGridView1.Font, Brushes.Black, 
                new RectangleF(x + 2, y + 2, cell.OwningColumn.Width - 4, rowHeight - 4), 
                new StringFormat { Alignment = StringAlignment.Near, LineAlignment = StringAlignment.Center });
            
            x += cell.OwningColumn.Width;
        }

        y += rowHeight;
    }
}

private void button3_Click(object sender, EventArgs e)
{
    try
    {
        printDocument1.DefaultPageSettings.Landscape = true; 
        dataGridView1.ClearSelection();
        // 重置打印行索引
        currentPrintRow = 0;

        printPreviewDialog1.Document = printDocument1;
        printPreviewDialog1.PrintPreviewControl.Zoom = 1;
        printPreviewDialog1.ShowDialog();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

关键说明 #

• currentPrintRow变量：每次打印前重置为0，打印过程中记录当前已打印到的行，用于判断是否需要继续分页。
• 表头重复绘制：通过DrawHeader方法确保每页顶部都显示表头，提升可读性。
• 行高与列宽适配：直接使用DataGridView的行高和列宽，避免缩放导致的字体模糊问题。
• 交替行颜色：可选优化，让打印内容更易读。
• 可见列判断：跳过隐藏列，保证打印内容与界面一致。

内容的提问来源于stack exchange，提问作者John B