在WPF DataGrid中打印可见行

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Printing;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void PrintButton_Click(object sender, RoutedEventArgs e)
    {
        PrintDialog printDialog = new PrintDialog();
        if (printDialog.ShowDialog() == true)
        {
            PrintDocument printDocument = new PrintDocument();
            printDocument.PrintPage += PrintDocument_PrintPage;
            printDialog.PrintDocument(printDocument.DocumentPaginator, "Printing DataGrid");
        }
    }

    private void PrintDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
    {
        DataGridRow[] visibleRows = GetVisibleRows();

        // 设置打印布局
        float rowHeight = 30; // 行高
        float marginLeft = 50; // 左边距
        float marginTop = 50; // 上边距
        float yPosition = marginTop;

        foreach (DataGridRow row in visibleRows)
        {
            // 绘制行数据
            DataGridCell[] cells = GetCells(row);
            float xPosition = marginLeft;
            for (int i = 0; i < cells.Length; i++)
            {
                // 绘制单元格内容
                DrawCellContent(e.Graphics, xPosition, yPosition, cells[i]);

                // 更新X坐标位置
                xPosition += cells[i].ActualWidth;
            }

            // 更新Y坐标位置
            yPosition += rowHeight;
        }

        // 检查是否还有可见行需要打印
        if (yPosition + rowHeight <= e.MarginBounds.Bottom)
        {
            e.HasMorePages = true;
        }
        else
        {
            e.HasMorePages = false;
        }
    }

    private DataGridRow[] GetVisibleRows()
    {
        List<DataGridRow> visibleRows = new List<DataGridRow>();
        for (int i = 0; i < dataGrid.Items.Count; i++)
        {
            DataGridRow row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(i);
            if (row != null && row.IsVisible)
            {
                visibleRows.Add(row);
            }
        }
        return visibleRows.ToArray();
    }

    private DataGridCell[] GetCells(DataGridRow row)
    {
        List<DataGridCell> cells = new List<DataGridCell>();
        if (row != null)
        {
            for (int i = 0; i < dataGrid.Columns.Count; i++)
            {
                DataGridCell cell = (DataGridCell)row.ItemContainerGenerator.ContainerFromIndex(i);
                if (cell != null)
                {
                    cells.Add(cell);
                }
            }
        }
        return cells.ToArray();
    }

    private void DrawCellContent(Graphics graphics, float x, float y, DataGridCell cell)
    {
        string content = (cell.Content ?? "").ToString();
        Brush brush = new SolidBrush(System.Drawing.Color.Black);
        Font font = new Font("Arial", 10);
        graphics.DrawString(content, font, brush, x, y);
    }
}