帮忙解决这个问题

Question

 private void button1_Click(object sender, EventArgs e)
        {
            
            printDialog1.ShowDialog(); //设置打印文档
            printPreviewDialog1.Document = this.printDocument1;
            printPreviewDialog1.ShowDialog();
                    }        private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {            //e.Graphics.DrawString(dataGridView1.Columns.ToString(), new Font("宋体", 10, FontStyle.Regular), Brushes.Black, 260, 400);
            try
            {
                DataTable dt = (DataTable)dataGridView1.DataSource;                int r = 0;
                int c = 20;
                for (int i = 0; i < dt.Rows.Count; i++)
                {                    for (int j = 0; j < dt.Columns.Count; j++)
                    {                        e.Graphics.DrawString(dt.Rows[i][j].ToString(), new Font("宋体", 10, FontStyle.Regular), Brushes.Black, r, c);
                        r = r + 60;                    }
                    r = 0;
                    c += 20;                }
            }
            catch (Exception ex)
            {
            }
                    }打印没有数据 是空的  程序怎么修改下  高手指点下

Answer 1

DataTable dt = (DataTable)dataGridView1.DataSource;提示有问题  该怎么写代码  好像有类型转化异常

Answer 2

DataTable dt = dataGridView1.DataSource as DataTable;

Answer 3

不行     dataGridView 上的数据不能打印  
谁有好的程序源码   将dataGridView 上的数据浏览打印

Answer 4

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Drawing.Printing;
using System.Windows.Forms;namespace Attendance
{    /// <summary>
    /// <para>打印DataGridView</para>
    /// <para>用法：</para>
    /// <para> DataGridViewPrint dgvPrint = new DataGridViewPrint(DataGridView dataGridView1);</para>
    /// <para> dgvPrint.Print();</para>
    /// </summary>    public class DataGridViewPrint
    {
        private DataGridView dataGridView;
        private PrintDocument printDocument;
        private PageSetupDialog pageSetupDialog;
        private PrintPreviewDialog printPreviewDialog;
        private int dgvIndex = 0;
        private int rowCount = 0;
        private int colCount = 0;
        private int x = 0;
        private int y = 0;
        int i = 0;
        private int rowGap = 60;
        private int leftMargin = 50;
        private Font font = new Font("Arial", 10);
        private Font headingFont = new Font("Arial", 11, FontStyle.Underline);
        private Font captionFont = new Font("Arial", 10, FontStyle.Bold);
        private Brush brush = new SolidBrush(Color.Black);
        private string cellValue = string.Empty;        public DataGridViewPrint(DataGridView dataGridView)
        {
            this.dataGridView = dataGridView;
            printDocument = new PrintDocument();
            printDocument.PrintPage += new PrintPageEventHandler(this.printDocument_PrintPage);
        }        private void printDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            //for (; dgvIndex < dataGridView.Length; dgvIndex++)
            
                rowCount = dataGridView.Rows.Count-1;
                colCount = dataGridView.ColumnCount;
                //print headings
                y += rowGap;
                x = leftMargin;
                for (int j = 0; j < colCount; j++)
                {
                    if (dataGridView.Columns[j].Width > 0)
                    {
                        cellValue = dataGridView.Columns[j].HeaderText;
                        e.Graphics.FillRectangle(new SolidBrush(Color.LightGray), x, y, dataGridView.Columns[j].Width, rowGap);
                        e.Graphics.DrawRectangle(Pens.Black, x, y, dataGridView.Columns[j].Width, rowGap);
                        e.Graphics.DrawString(cellValue, headingFont, brush, x, y);
                        x += dataGridView.Columns[j].Width;
                    }
                }                //print all rows
                for (; i < rowCount; i++)
                {
                    y += rowGap;
                    x = leftMargin;
                    for (int j = 0; j < colCount; j++)
                    {
                        if (dataGridView.Columns[j].Width > 0)
                        {
                            cellValue = dataGridView.Rows[i].Cells[j].Value.ToString();
                            e.Graphics.DrawRectangle(Pens.Black, x, y, dataGridView.Columns[j].Width, rowGap);
                            e.Graphics.DrawString(cellValue, font, brush, x, y);
                            x += dataGridView.Columns[j].Width;
                        }
                    }
                    if (y >= e.PageBounds.Height - 80)
                    {
                        // 允許多頁打印
                        y = 0;
                        e.HasMorePages = true;
                        i++;
                        return;
                    }
                }
                y += rowGap;
                for (int j = 0; j < colCount; j++)
                {
                    e.Graphics.DrawString(" ", font, brush, x, y);
                }
                i = 0;
            
            e.HasMorePages = false;
        }        public PrintDocument GetPrintDocument()
        {
            return printDocument;
        }        public void Print()
        {
            try
            {
                pageSetupDialog = new PageSetupDialog();
                pageSetupDialog.Document = printDocument;
                pageSetupDialog.ShowDialog();
                printPreviewDialog = new PrintPreviewDialog();
                printPreviewDialog.Document = printDocument;
                printPreviewDialog.Height = 600;
                printPreviewDialog.Width = 800;
                printPreviewDialog.ShowDialog();
            }
            catch (Exception e)
            {
                throw new Exception("Printer error." + e.Message);
            }
        }
    }
}本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/resigner/archive/2010/05/20/5609745.aspx