推荐一款DataGridView的打印解决方案
今天有朋友请教在CS的WinForm中如何打印DataGridView中的内容。
网上搜索一番之后，还是在藏宝库CodeProject中找到一篇好文章《DataGridView Printing by Selecting Columns and Rows》（http://www.codeproject.com/KB/grid/PrintDataGrid_CS.aspx）
效果图
【打印设置画面】
【打印预览画面】
解决方案构成
这个打印解决方案由一个打印设置的窗体，及一个打印类组成。
可用于以下场景：
1、显示的数据量较大，但又没有必要打印全部数据的时候
2、希望打印出的列宽能自动适应页面宽度
打印类主要方法
Print_DataGridView（共有）: 被外部类调用的主方法.
PrintDoc_BeginPrint（私有）: 初始化一些打印变量
PrintDoc_PrintPage（私有）: 执行打印工作
DrawFooter（私有）: 页脚的处理部分
打印类代码
/* ***************************************************
* DataGridView打印类 * 原作者：Afrasiab Cheraghi. * 修改者：何奎 * 
* **************************************************/
using System;using System.Collections.Generic;using System.Windows.Forms;using System.Drawing;using System.Collections;using System.Data;using System.Text;namespace testPrint{
class PrintDGV
{
private static StringFormat StrFormat; // Holds content of a TextBox Cell to write by DrawString private static StringFormat StrFormatComboBox; // Holds content of a Boolean Cell to write by DrawImage private static Button CellButton; // Holds the Contents of Button Cell private static CheckBox CellCheckBox; // Holds the Contents of CheckBox Cell private static ComboBox CellComboBox; // Holds the Contents of ComboBox Cell private static int TotalWidth; // Summation of Columns widths private static int RowPos; // Position of currently printing row private static bool NewPage; // Indicates if a new page reached private static int PageNo; // Number of pages to print private static ArrayList ColumnLefts = new ArrayList(); // Left Coordinate of Columns private static ArrayList ColumnWidths = new ArrayList(); // Width of Columns private static ArrayList ColumnTypes = new ArrayList(); // DataType of Columns private static int CellHeight; // Height of DataGrid Cell private static int RowsPerPage; // Number of Rows per Page private static System.Drawing.Printing.PrintDocument printDoc = new System.Drawing.Printing.PrintDocument(); // PrintDocumnet Object used for printing private static string PrintTitle = ""; // Header of pages private static DataGridView dgv; // Holds DataGridView Object to print its contents private static List<string> SelectedColumns = new List<string>(); // The Columns Selected by user to print. private static List<string> AvailableColumns = new List<string>(); // All Columns avaiable in DataGrid private static bool PrintAllRows = true; // True = print all rows, False = print selected rows private static bool FitToPageWidth = true; // True = Fits selected columns to page width , False = Print columns as showed private static int HeaderHeight = 0; public static void Print_DataGridView(DataGridView dgv1) { PrintPreviewDialog ppvw; try { // Getting DataGridView object to print dgv = dgv1; // Getting all Coulmns Names in the DataGridView AvailableColumns.Clear(); foreach (DataGridViewColumn c in dgv.Columns) { if (!c.Visible) continue; AvailableColumns.Add(c.HeaderText);
} // Showing the PrintOption Form PrintOptions dlg = new PrintOptions(AvailableColumns); if (dlg.ShowDialog() != DialogResult.OK) return; PrintTitle = dlg.PrintTitle; PrintAllRows = dlg.PrintAllRows; FitToPageWidth = dlg.FitToPageWidth; SelectedColumns = dlg.GetSelectedColumns(); RowsPerPage = 0; ppvw = new PrintPreviewDialog(); ppvw.Document = printDoc; // Showing the Print Preview Page printDoc.BeginPrint +=new System.Drawing.Printing.PrintEventHandler(PrintDoc_BeginPrint); printDoc.PrintPage +=new System.Drawing.Printing.PrintPageEventHandler(PrintDoc_PrintPage); if (ppvw.ShowDialog() != DialogResult.OK) { printDoc.BeginPrint -= new System.Drawing.Printing.PrintEventHandler(PrintDoc_BeginPrint); printDoc.PrintPage -= new System.Drawing.Printing.PrintPageEventHandler(PrintDoc_PrintPage); return; } // Printing the Documnet printDoc.Print(); printDoc.BeginPrint -= new System.Drawing.Printing.PrintEventHandler(PrintDoc_BeginPrint); printDoc.PrintPage -= new System.Drawing.Printing.PrintPageEventHandler(PrintDoc_PrintPage); } catch (Exception ex) { MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } finally { } } private static void PrintDoc_BeginPrint(object sender, System.Drawing.Printing.PrintEventArgs e) { try { // Formatting the Content of Text Cell to print StrFormat = new StringFormat(); StrFormat.Alignment = StringAlignment.Near; StrFormat.LineAlignment = StringAlignment.Center; StrFormat.Trimming = StringTrimming.EllipsisCharacter; // Formatting the Content of Combo Cells to print StrFormatComboBox = new StringFormat(); StrFormatComboBox.LineAlignment = StringAlignment.Center; StrFormatComboBox.FormatFlags = StringFormatFlags.NoWrap; StrFormatComboBox.Trimming = StringTrimming.EllipsisCharacter; ColumnLefts.Clear(); ColumnWidths.Clear(); ColumnTypes.Clear(); CellHeight = 0; RowsPerPage = 0; // For various column types CellButton = new Button(); CellCheckBox = new CheckBox(); CellComboBox = new ComboBox(); // Calculating Total Widths TotalWidth = 0; foreach (DataGridViewColumn GridCol in dgv.Columns) { if (!GridCol.Visible) continue; if (!PrintDGV.SelectedColumns.Contains(GridCol.HeaderText)) continue; TotalWidth += GridCol.Width; } PageNo = 1; NewPage = true; RowPos = 0; } catch (Exception ex) { MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } } private static void PrintDoc_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e) { int tmpWidth, i; int tmpTop = e.MarginBounds.Top; int tmpLeft = e.MarginBounds.Left; try { // Before starting first page, it saves Width & Height of Headers and CoulmnType if (PageNo == 1) { foreach (DataGridViewColumn GridCol in dgv.Columns) { if (!GridCol.Visible) continue; // Skip if the current column not selected if (!PrintDGV.SelectedColumns.Contains(GridCol.HeaderText)) continue; // Detemining whether the columns are fitted to page or not. if (FitToPageWidth) tmpWidth = (int)(Math.Floor((double)((double)GridCol.Width / (double)TotalWidth * (double)TotalWidth * ((double)e.MarginBounds.Width / (double)TotalWidth)))); else tmpWidth = GridCol.Width; HeaderHeight = (int)(e.Graphics.MeasureString(GridCol.HeaderText, GridCol.InheritedStyle.Font, tmpWidth).Height) + 11; // Save width & height of headres and ColumnType ColumnLefts.Add(tmpLeft); ColumnWidths.Add(tmpWidth); ColumnTypes.Add(GridCol.GetType()); tmpLeft += tmpWidth; } } // Printing Current Page, Row by Row while (RowPos <= dgv.Rows.Count - 1) { DataGridViewRow GridRow = dgv.Rows[RowPos]; if (GridRow.IsNewRow || (!PrintAllRows && !GridRow.Selected)) { RowPos++; continue; } CellHeight = GridRow.Height; if (tmpTop + CellHeight >= e.MarginBounds.Height + e.MarginBounds.Top) { DrawFooter(e, RowsPerPage); NewPage = true; PageNo++; e.HasMorePages = true; return; } else { if (NewPage) { // Draw Header e.Graphics.DrawString(PrintTitle, new Font(dgv.Font, FontStyle.Bold), Brushes.Black, e.MarginBounds.Left, e.MarginBounds.Top - e.Graphics.MeasureString(PrintTitle, new Font(dgv.Font, FontStyle.Bold), e.MarginBounds.Width).Height - 13); String s = DateTime.Now.ToLongDateString() + " " + DateTime.Now.ToShortTimeString(); e.Graphics.DrawString(s, new Font(dgv.Font, FontStyle.Bold), Brushes.Black, e.MarginBounds.Left + (e.MarginBounds.Width - e.Graphics.MeasureString(s, new Font(dgv.Font, FontStyle.Bold), e.MarginBounds.Width).Width), e.MarginBounds.Top - e.Graphics.MeasureString(PrintTitle, new Font(new Font(dgv.Font, FontStyle.Bold), FontStyle.Bold), e.MarginBounds.Width).Height - 13); // Draw Columns tmpTop = e.MarginBounds.Top; i = 0; foreach (DataGridViewColumn GridCol in dgv.Columns) { if (!GridCol.Visible) continue; if (!PrintDGV.SelectedColumns.Contains(GridCol.HeaderText)) continue; e.Graphics.FillRectangle(new SolidBrush(Color.LightGray), new Rectangle((int) ColumnLefts[i], tmpTop, (int)ColumnWidths[i], HeaderHeight)); e.Graphics.DrawRectangle(Pens.Black, new Rectangle((int) ColumnLefts[i], tmpTop, (int)ColumnWidths[i], HeaderHeight)); e.Graphics.DrawString(GridCol.HeaderText, GridCol.InheritedStyle.Font, new SolidBrush(GridCol.InheritedStyle.ForeColor), new RectangleF((int)ColumnLefts[i], tmpTop, (int)ColumnWidths[i], HeaderHeight), StrFormat); i++; } NewPage = false; tmpTop += HeaderHeight; } // Draw Columns Contents i = 0; foreach (DataGridViewCell Cel in GridRow.Cells) { if (!Cel.OwningColumn.Visible) continue; if (!SelectedColumns.Contains(Cel.OwningColumn.HeaderText)) continue; // For the TextBox Column if (((Type) ColumnTypes[i]).Name == "DataGridViewTextBoxColumn" || ((Type) ColumnTypes[i]).Name == "DataGridViewLinkColumn") { e.Graphics.DrawString(Cel.Value.ToString(), Cel.InheritedStyle.Font, new SolidBrush(Cel.InheritedStyle.ForeColor), new RectangleF((int)ColumnLefts[i], (float)tmpTop, (int)ColumnWidths[i], (float)CellHeight), StrFormat); } // For the Button Column else if (((Type) ColumnTypes[i]).Name == "DataGridViewButtonColumn") { CellButton.Text = Cel.Value.ToString(); CellButton.Size = new Size((int)ColumnWidths[i], CellHeight); Bitmap bmp =new Bitmap(CellButton.Width, CellButton.Height); CellButton.DrawToBitmap(bmp, new Rectangle(0, 0, bmp.Width, bmp.Height)); e.Graphics.DrawImage(bmp, new Point((int)ColumnLefts[i], tmpTop)); } // For the CheckBox Column else if (((Type) ColumnTypes[i]).Name == "DataGridViewCheckBoxColumn") { CellCheckBox.Size = new Size(14, 14); CellCheckBox.Checked = (bool)Cel.Value; Bitmap bmp = new Bitmap((int)ColumnWidths[i], CellHeight); Graphics tmpGraphics = Graphics.FromImage(bmp); tmpGraphics.FillRectangle(Brushes.White, new Rectangle(0, 0, bmp.Width, bmp.Height)); CellCheckBox.DrawToBitmap(bmp, new Rectangle((int)((bmp.Width - CellCheckBox.Width) / 2), (int)((bmp.Height - CellCheckBox.Height) / 2), CellCheckBox.Width, CellCheckBox.Height)); e.Graphics.DrawImage(bmp, new Point((int)ColumnLefts[i], tmpTop)); } // For the ComboBox Column else if (((Type) ColumnTypes[i]).Name == "DataGridViewComboBoxColumn") { CellComboBox.Size = new Size((int)ColumnWidths[i], CellHeight); Bitmap bmp = new Bitmap(CellComboBox.Width, CellComboBox.Height); CellComboBox.DrawToBitmap(bmp, new Rectangle(0, 0, bmp.Width, bmp.Height)); e.Graphics.DrawImage(bmp, new Point((int)ColumnLefts[i], tmpTop)); e.Graphics.DrawString(Cel.Value.ToString(), Cel.InheritedStyle.Font, new SolidBrush(Cel.InheritedStyle.ForeColor), new RectangleF((int)ColumnLefts[i] + 1, tmpTop, (int)ColumnWidths[i] - 16, CellHeight), StrFormatComboBox); } // For the Image Column else if (((Type) ColumnTypes[i]).Name == "DataGridViewImageColumn") { Rectangle CelSize = new Rectangle((int)ColumnLefts[i], tmpTop, (int)ColumnWidths[i], CellHeight); Size ImgSize = ((Image)(Cel.FormattedValue)).Size; e.Graphics.DrawImage((Image)Cel.FormattedValue, new Rectangle((int)ColumnLefts[i] + (int)((CelSize.Width - ImgSize.Width) / 2), tmpTop + (int)((CelSize.Height - ImgSize.Height) / 2), ((Image)(Cel.FormattedValue)).Width, ((Image)(Cel.FormattedValue)).Height)); } // Drawing Cells Borders e.Graphics.DrawRectangle(Pens.Black, new Rectangle((int)ColumnLefts[i], tmpTop, (int)ColumnWidths[i], CellHeight)); i++; } tmpTop += CellHeight; } RowPos++; // For the first page it calculates Rows per Page if (PageNo == 1) RowsPerPage++; } if (RowsPerPage == 0) return; // Write Footer (Page Number) DrawFooter(e, RowsPerPage); e.HasMorePages = false; } catch (Exception ex) { MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } } private static void DrawFooter(System.Drawing.Printing.PrintPageEventArgs e, int RowsPerPage) { double cnt = 0; // Detemining rows number to print if (PrintAllRows) { if (dgv.Rows[dgv.Rows.Count - 1].IsNewRow) cnt = dgv.Rows.Count - 2; // When the DataGridView doesn't allow adding rows else cnt = dgv.Rows.Count - 1; // When the DataGridView allows adding rows } else cnt = dgv.SelectedRows.Count; // Writing the Page Number on the Bottom of Page string PageNum = " 第 " + PageNo.ToString() + " 页，共 " + Math.Ceiling((double)(cnt / RowsPerPage)).ToString() + " 页"; e.Graphics.DrawString(PageNum, dgv.Font, Brushes.Black, e.MarginBounds.Left + (e.MarginBounds.Width - e.Graphics.MeasureString(PageNum, dgv.Font, e.MarginBounds.Width).Width) / 2, e.MarginBounds.Top + e.MarginBounds.Height + 31); } }}
示例工程下载：
testPrint
