c#中怎样实现多页打印？

用C#的printdocument写数据，要求每页只写入31排，写满一页后，将多的内容写到第二页，以此类推，该如何写？
请根据我写的代码进行修改，怎样使我的长字符串str显示在多页上？

private void printDocument1_PrintPage(object sender, PrintPageEventArgs e)
        {
            string str = "Hello,World!,This,is,a,multi - page,print,example," +
                "Hello,World!,This,is,a,multi - page,print,example," +
                "Hello,World!,This,is,a,multi - page,print,example," +
                "Hello,World!,This,is,a,multi - page,print,example," +
                "Hello,World!,This,is,a,multi - page,print,example," +
                "Hello,World!,This,is,a,multi - page,print,example," +
                "Hello,World!,This,is,a,multi - page,print,example," +
                "Hello,World!,This,is,a,multi - page,print,example," +
                "Hello,World!,This,is,a,multi - page,print,example,";
            string[] arr = str.Split(',');
 
            // 定义变量表示当前页的编号、每页的行数和当前已经打印的行数
            int page = 1;
            int rowsPerPage = 31;
            int rowsPrinted = 0;
            int totalPages = (arr.Length + 30) / 31;
 
            // 创建用于绘制文本的字体
            Font font = new Font("Arial", 10);
 
            // 循环打印每一页
            while (page <= totalPages)
            {
                //循环结束后显示的行数清零
                int row = 0;
 
                // 绘制当前页的内容
                for (int i = rowsPrinted; i < arr.Length; i++)
                {
                    e.Graphics.DrawString(arr[i], font, Brushes.Black, new PointF(615, 215 + row * 18));
                    rowsPrinted++;
                    row++;
 
                    // 如果已经绘制的行数达到了每页的行数，跳出循环
                    if (rowsPrinted >= rowsPerPage * page)
                    {
                        break;
                    }
                }
                page++;
 
                //显示页码
                e.Graphics.DrawString(page.ToString(), font, Brushes.Black, new PointF(615, 215 + 32 * 18));
 
                // 如果还有更多的页面要打印，设置HasMorePages为true
                if (page <= totalPages)
                {
                    e.HasMorePages = true;
 
                }
                else
                {
                    e.HasMorePages = false;
 
                }
            }
 
        }
 
private void 打印预览_Click(object sender, EventArgs e)
        {
 
 
            PrintPreviewDialog printPreviewDialog = new PrintPreviewDialog();
            printPreviewDialog.Document = printDocument1;
            printPreviewDialog.ShowDialog();
 
 
        }
 

不是问过了吗，怎么又问
page++;放到if (page <= totalPages)后面去

问题解决了，用下面的代码

int page = 1;
        int rowsPerPage = 31;
        int rowsPrinted = 0;
        private void printDocument1_PrintPage(object sender, PrintPageEventArgs e)
        {
            string str = "Hello,World!,This,is,a,multi - page,print,example," +
                "Hello,World!,This,is,a,multi - page,print,example," +
                "Hello,World!,This,is,a,multi - page,print,example," +
                "Hello,World!,This,is,a,multi - page,print,example," +
                "Hello,World!,This,is,a,multi - page,print,example";
            string[] arr = str.Split(',');
            // 定义变量表示当前页的编号、每页的行数和当前已经打印的行数
            
            
            int totalPages = (arr.Length + 30) / 31;

            // 创建用于绘制文本的字体
            Font font = new Font("Arial", 10);

            // 循环打印每一页
            if (page <= totalPages)
            {
                //循环结束后显示的行数清零
                int row = 0;

                // 绘制当前页的内容
                for (int i = rowsPrinted; i < arr.Length; i++)
                {
                    //显示页面内容
                    e.Graphics.DrawString(arr[i], font, Brushes.Black, new PointF(615, 215 + row * 18));
                    //MessageBox.Show("当前打印行=" + (i + 1));
                    //MessageBox.Show("当前行的内容=" + arr[i] + (i + 1));

                    //显示页码
                    e.Graphics.DrawString(page.ToString(), font, Brushes.Black, new PointF(615, 215 + 32 * 18));
                    rowsPrinted++;
                    row++;

                    // 如果已经绘制的行数达到了每页的行数，跳出循环
                    if (rowsPrinted >= rowsPerPage * page)
                    {
                        break;
                    }
                }
                page++;
            
            //MessageBox.Show("下一个页码=" + page);

            // 如果还有更多的页面要打印，设置HasMorePages为true
            if (page <= totalPages)
                {
                    e.HasMorePages = true;
                }
                else
                {
                    e.HasMorePages = false;
                }
            }
        }

private void 打印预览_Click(object sender, EventArgs e)
        {

            PrintPreviewDialog printPreviewDialog = new PrintPreviewDialog();
            printPreviewDialog.Document = printDocument1;
            printPreviewDialog.ShowDialog();

        }