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自己寫的一個c#winform打印類

using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Windows.Forms;
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using System.Drawing.Printing;
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using System.Drawing;
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namespace Etaocn.Util
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{
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/// <summary>
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/// 創建人賀挺
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/// </summary>
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public class Printer
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{
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private DataGridView dataview;
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private PrintDocument printDoc;
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//打印有效區域的寬度
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int width;
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int height;
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int columns;
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double Rate;
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bool hasMorePage = false;
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int currRow = 0;
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int rowHeight = 20;
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//打印頁數
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int PageNumber;
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//當前打印頁的行數
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int pageSize = 20;
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//當前打印的頁碼
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int PageIndex;
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private int PageWidth; //打印紙的寬度
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private int PageHeight; //打印紙的高度
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private int LeftMargin; //有效打印區距離打印紙的左邊大小
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private int TopMargin;//有效打印區距離打印紙的上面大小
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private int RightMargin;//有效打印區距離打印紙的右邊大小
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private int BottomMargin;//有效打印區距離打印紙的下邊大小
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int rows;
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/// <summary>
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/// 構造函數
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/// </summary>
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/// <param name="dataview">要打印的DateGridView</param>
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/// <param name="printDoc">PrintDocument用于獲取打印機的設置</param>
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public Printer(DataGridView dataview, PrintDocument printDoc)
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{
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this.dataview = dataview;
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this.printDoc = printDoc;
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PageIndex = 0;
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//獲取打印數據的具體行數
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this.rows = dataview.RowCount;
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this.columns = dataview.ColumnCount;
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//判斷打印設置是否是橫向打印
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if (!printDoc.DefaultPageSettings.Landscape)
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{
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PageWidth = printDoc.DefaultPageSettings.PaperSize.Width;
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PageHeight = printDoc.DefaultPageSettings.PaperSize.Height;
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}
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else
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{
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PageHeight = printDoc.DefaultPageSettings.PaperSize.Width;
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PageWidth = printDoc.DefaultPageSettings.PaperSize.Height;
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}
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LeftMargin = printDoc.DefaultPageSettings.Margins.Left;
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TopMargin = printDoc.DefaultPageSettings.Margins.Top;
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RightMargin = printDoc.DefaultPageSettings.Margins.Right;
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BottomMargin = printDoc.DefaultPageSettings.Margins.Bottom;
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height = PageHeight - TopMargin - BottomMargin - 2;
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width = PageWidth - LeftMargin - RightMargin - 2;
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double tempheight = height;
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double temprowHeight = rowHeight;
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while (true)
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{
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string temp = Convert.ToString(tempheight / Math.Round(temprowHeight, 3));
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int i = temp.IndexOf('.');
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double tt = 100;
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if (i != -1)
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{
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tt = Math.Round(Convert.ToDouble(temp.Substring(temp.IndexOf('.'))), 3);
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}
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if (tt <= 0.01)
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{
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rowHeight = Convert.ToInt32(temprowHeight);
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break;
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}
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else
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{
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temprowHeight = temprowHeight + 0.01;
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}
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}
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pageSize = height / rowHeight;
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if ((rows + 1) <= pageSize)
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{
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pageSize = rows + 1;
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PageNumber = 1;
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}
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else
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{
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PageNumber = rows / (pageSize - 1);
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if (rows % (pageSize - 1) != 0)
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{
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PageNumber = PageNumber + 1;
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}
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}
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117

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}
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121

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/// <summary>
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/// 初始化打印
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/// </summary>
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private void InitPrint()
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{
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PageIndex = PageIndex + 1;
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if (PageIndex == PageNumber)
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{
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hasMorePage = false;
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if (PageIndex != 1)
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{
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pageSize = rows % (pageSize - 1) + 1;
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}
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}
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else
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{
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hasMorePage = true;
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}
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}
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//打印頭
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private void DrawHeader(Graphics g)
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{
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Font font = new Font("宋體", 12, FontStyle.Bold);
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int temptop = (rowHeight / 2) + TopMargin + 1;
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int templeft = LeftMargin + 1;
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for (int i = 0; i < this.columns; i++)
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{
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string headString = this.dataview.Columns[i].HeaderText;
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float fontHeight = g.MeasureString(headString, font).Height;
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float fontwidth = g.MeasureString(headString, font).Width;
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float temp = temptop - (fontHeight) / 3;
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g.DrawString(headString, font, Brushes.Black, new PointF(templeft, temp));
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templeft = templeft + (int)(this.dataview.Columns[i].Width / Rate) + 1;
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}
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}
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//畫表格
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private void DrawTable(Graphics g)
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{
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Rectangle border = new Rectangle(LeftMargin, TopMargin, width, (pageSize) * rowHeight);
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g.DrawRectangle(new Pen(Brushes.Black, 2), border);
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for (int i = 1; i < pageSize; i++)
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{
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if (i != 1)
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{
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g.DrawLine(new Pen(Brushes.Black, 1), new Point(LeftMargin + 1, (rowHeight * i) + TopMargin + 1), new Point(width + LeftMargin, (rowHeight * i) + TopMargin + 1));
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}
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else
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{
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g.DrawLine(new Pen(Brushes.Black, 2), new Point(LeftMargin + 1, (rowHeight * i) + TopMargin + 1), new Point(width + LeftMargin, (rowHeight * i) + TopMargin + 1));
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}
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}
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//計算出列的總寬度和打印紙比率
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Rate = Convert.ToDouble(GetDateViewWidth()) / Convert.ToDouble(width);
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int tempLeft = LeftMargin + 1;
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int endY = (pageSize) * rowHeight + TopMargin;
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for (int i = 1; i < columns; i++)
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{
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tempLeft = tempLeft + 1 + (int)(this.dataview.Columns[i - 1].Width / Rate);
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g.DrawLine(new Pen(Brushes.Black, 1), new Point(tempLeft, TopMargin), new Point(tempLeft, endY));
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}
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}
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/// <summary>
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/// 獲取打印的列的總寬度
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/// </summary>
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/// <returns></returns>
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private int GetDateViewWidth()
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{
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int total = 0;
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for (int i = 0; i < this.columns; i++)
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{
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total = total + this.dataview.Columns[i].Width;
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}
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return total;
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}
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//打印行數據
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private void DrawRows(Graphics g)
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{
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Font font = new Font("宋體", 12, FontStyle.Regular);
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int temptop = (rowHeight / 2) + TopMargin + 1 + rowHeight;
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for (int i = currRow; i < pageSize + currRow - 1; i++)
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{
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int templeft = LeftMargin + 1;
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for (int j = 0; j < columns; j++)
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{
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string headString = this.dataview.Rows[i].Cells[j].Value.ToString();
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float fontHeight = g.MeasureString(headString, font).Height;
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float fontwidth = g.MeasureString(headString, font).Width;
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float temp = temptop - (fontHeight) / 3;
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while (true)
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{
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if (fontwidth <= (int)(this.dataview.Columns[j].Width / Rate))
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{
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break;
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}
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else
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{
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headString = headString.Substring(0, headString.Length - 1);
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fontwidth = g.MeasureString(headString, font).Width;
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}
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}
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g.DrawString(headString, font, Brushes.Black, new PointF(templeft, temp));
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templeft = templeft + (int)(this.dataview.Columns[j].Width / Rate) + 1;
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}
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temptop = temptop + rowHeight;
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}
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currRow = pageSize + currRow - 1;
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}
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/// <summary>
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/// 在PrintDocument中的PrintPage方法中調用
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/// </summary>
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/// <param name="g">傳入PrintPage中PrintPageEventArgs中的Graphics</param>
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/// <returns>是否還有打印頁有返回true，無則返回false</returns>
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public bool Print(Graphics g)
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{
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InitPrint();
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DrawTable(g);
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DrawHeader(g);
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DrawRows(g);
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//打印頁碼
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string pagestr = PageIndex + " / " + PageNumber;
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Font font = new Font("宋體", 12, FontStyle.Regular);
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g.DrawString(pagestr, font, Brushes.Black, new PointF((PageWidth / 2) - g.MeasureString(pagestr, font).Width, PageHeight - (BottomMargin / 2) - g.MeasureString(pagestr, font).Height));
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//打印查詢的功能項名稱
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string temp = dataview.Tag.ToString() + " " + DateTime.Now.ToString("yyyy-MM-dd HH:mm");
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g.DrawString(temp, font, Brushes.Black, new PointF(PageWidth - 5 - g.MeasureString(temp, font).Width, PageHeight - 5 - g.MeasureString(temp, font).Height));
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return hasMorePage;
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}
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}
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}
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posted on 2009-09-19 09:46 賀挺閱讀(8505) 評論(8) 編輯收藏所屬分類: c#范例

調用你的方法但是到這一行就顯示了“未將對象引用到實例化的錯誤” 。
string temp = dataview.Tag.ToString() + " " + DateTime.Now.ToString("yyyy-MM-dd HH:mm");
267 g.DrawString(temp, font, Brushes.Black, new PointF(PageWidth - 5 - g.MeasureString(temp, font).Width, PageHeight - 5 - g.MeasureString(temp, font).Height));“

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