DataGrid 打印类

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using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Printing;
using System.Data;
using System.Windows.Forms;

namespace WindowsApplication1
{
    /**//// <summary>
    /// Summary description for DatagridPrint.
    /// </summary>
    public class DatagridPrint
    {
        private DataGrid dataGrid;
        private PrintDocument printDocument;
        private PageSetupDialog pageSetupDialog;
        private PrintPreviewDialog printPreviewDialog;

        public DatagridPrint(DataGrid dataGrid)
        { 
            this.dataGrid = dataGrid; 
            printDocument = new PrintDocument();
            printDocument.PrintPage += new PrintPageEventHandler(this.printDocument_PrintPage);
        } 

        private void printDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            int rowCount = 0;
            int colCount = 0;
            int x = 0;
            int y = 0;
            int rowGap = 20;
            int colGap = 5;
            int leftMargin = 50;
            Font font = new Font("Arial", 10);
            Font headingFont = new Font("Arial", 11, FontStyle.Underline);
            Font captionFont = new Font("Arial", 10, FontStyle.Bold); 
            Brush brush = new SolidBrush(Color.Black);
            string cellValue = "";

            if(dataGrid.DataSource.GetType().ToString() == "System.Data.DataTable")
            {
                rowCount = ((DataTable)dataGrid.DataSource).Rows.Count;
            }
            else if(dataGrid.DataSource.GetType().ToString() == "System.Collections.ArrayList")
            {
                rowCount = ((ArrayList)dataGrid.DataSource).Count;
            }
            colCount = dataGrid.TableStyles[0].GridColumnStyles.Count;

            //print caption
            if(dataGrid.CaptionVisible)
            {
                y += rowGap;
                x = leftMargin;
                e.Graphics.DrawString(dataGrid.CaptionText, captionFont, brush, x, y);
            }

            //print headings 
            y += rowGap;
            x = leftMargin;
            for(int j = 0; j < colCount; j++)
            {
                if(dataGrid.TableStyles[0].GridColumnStyles[j].Width > 0)
                {
                    cellValue = dataGrid.TableStyles[0].GridColumnStyles[j].HeaderText; 
                    e.Graphics.DrawString(cellValue, headingFont, brush, x, y);
                    x += dataGrid.TableStyles[0].GridColumnStyles[j].Width + colGap; 
                }
            } 

            //print all rows
            for(int i = 0; i < rowCount; i++)
            {
                y += rowGap;
                x = leftMargin;
                for(int j = 0; j < colCount; j++)
                {
                    if(dataGrid.TableStyles[0].GridColumnStyles[j].Width > 0)
                    {
                        cellValue = dataGrid[i,j].ToString(); 
                        e.Graphics.DrawString(cellValue, font, brush, x, y);
                        x += dataGrid.TableStyles[0].GridColumnStyles[j].Width + colGap;
                        y = y + rowGap * (cellValue.Split(new char[] {' ', ' '}).Length - 1); 
                    }
                } 
            }
            string s = cellValue;
            string f3 = cellValue;
        }

        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);
            }

        }
    } 
}