C#打印文件的過程中，需要對所打印文件進行預覽，對版式也有所要求。C#打印文件期間，也有可能出現錯誤推出，這些都是我們開發人員需要考慮的問題。

以下是C#打印文件的代碼。

using System;  
using System.Drawing;  
using System.Collections;  
using System.ComponentModel;  
using System.Windows.Forms;  
using System.Data;  
using System.IO;  
using System.Text;  
using System.Drawing.Printing;  
 
namespace PrintDemo  
...{  
    /**//// <summary>  
    /// Form1 的摘要說明。  
    /// </summary>  
    public class DemoForm : System.Windows.Forms.Form  
    ...{  
        private System.Windows.Forms.TextBox txtDoc;  
        private System.Windows.Forms.MainMenu mnuMain;  
        private System.Windows.Forms.MenuItem mnuFile;  
        private System.Windows.Forms.MenuItem mnuFileOpen;  
        private System.Windows.Forms.MenuItem mnuFilePrint;  
        private System.Windows.Forms.MenuItem mnuFormat;  
        private System.Windows.Forms.MenuItem mnuFormatFont;  
        private System.Windows.Forms.OpenFileDialog dlgOpen;  
        private System.Windows.Forms.FontDialog dlgFont;  
        private System.Drawing.Printing.PrintDocument pdoc;  
        /**//// <summary>  
        /// 必需的設計器變量。  
        /// </summary>  
        private System.ComponentModel.Container components = null;  
        private System.Windows.Forms.MenuItem mnuFilePrintPreview;  
        private System.Windows.Forms.MenuItem mnuFilePageSetup;  
        private System.Windows.Forms.PrintPreviewDialog ppd;  
        private System.Windows.Forms.PageSetupDialog dlgPageSetup;  
        private System.Windows.Forms.PrintDialog dlgPrinterSetup;  
        private int totalLines;  
 
        public DemoForm()  
        ...{  
            //  
            // Windows 窗體設計器支持所必需的  
            //  
            InitializeComponent();  
 
            //  
            // TODO: 在 InitializeComponent 調用后添加任何構造函數代碼  
            //  
        }  
 
        /**//// <summary>  
        /// 清理所有正在使用的資源。  
        /// </summary>  
        protected override void Dispose( bool disposing )  
        ...{  
            if( disposing )  
            ...{  
                if (components != null)   
                ...{  
                    components.Dispose();  
                }  
            }  
            base.Dispose( disposing );  
        }  
 
        Windows 窗體設計器生成的代碼#region Windows 窗體設計器生成的代碼  
        /**//// <summary>  
        /// 設計器支持所需的方法 - 不要使用代碼編輯器修改  
        /// 此方法的內容。  
        /// </summary>  
        private void InitializeComponent()  
        ...{  
            System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(DemoForm));  
            this.txtDoc = new System.Windows.Forms.TextBox();  
            this.mnuMain = new System.Windows.Forms.MainMenu();  
            this.mnuFile = new System.Windows.Forms.MenuItem();  
            this.mnuFileOpen = new System.Windows.Forms.MenuItem();  
            this.mnuFilePrint = new System.Windows.Forms.MenuItem();  
            this.mnuFormat = new System.Windows.Forms.MenuItem();  
            this.mnuFormatFont = new System.Windows.Forms.MenuItem();  
            this.dlgOpen = new System.Windows.Forms.OpenFileDialog();  
            this.dlgFont = new System.Windows.Forms.FontDialog();  
            this.pdoc = new System.Drawing.Printing.PrintDocument();  
            this.mnuFilePrintPreview = new System.Windows.Forms.MenuItem();  
            this.mnuFilePageSetup = new System.Windows.Forms.MenuItem();  
            this.ppd = new System.Windows.Forms.PrintPreviewDialog();  
            this.dlgPageSetup = new System.Windows.Forms.PageSetupDialog();  
            this.dlgPrinterSetup = new System.Windows.Forms.PrintDialog();  
            this.SuspendLayout();  
            //   
            // txtDoc  
            //   
            this.txtDoc.Dock = System.Windows.Forms.DockStyle.Fill;  
            this.txtDoc.Location = new System.Drawing.Point(0, 0);  
            this.txtDoc.Multiline = true;  
            this.txtDoc.Name = "txtDoc";  
            this.txtDoc.ScrollBars = System.Windows.Forms.ScrollBars.Both;  
            this.txtDoc.Size = new System.Drawing.Size(560, 309);  
            this.txtDoc.TabIndex = 0;  
            this.txtDoc.Text = "";  
            this.txtDoc.WordWrap = false;  
            this.txtDoc.TextChanged += new System.EventHandler(this.txtDoc_TextChanged);  
            //   
            // mnuMain  
            //   
            this.mnuMain.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] ...{  
                                                                                    this.mnuFile,  
                                                                                    this.mnuFormat});  
            //   
            // mnuFile  
            //   
            this.mnuFile.Index = 0;  
            this.mnuFile.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] ...{  
                                                                                    this.mnuFileOpen,  
                                                                                    this.mnuFilePageSetup,  
                                                                                    this.mnuFilePrintPreview,  
                                                                                    this.mnuFilePrint});  
            this.mnuFile.Text = "文件(&F)";  
            //   
            // mnuFileOpen  
            //   
            this.mnuFileOpen.Index = 0;  
            this.mnuFileOpen.Text = "打開(&O)...";  
            this.mnuFileOpen.Click += new System.EventHandler(this.mnuFileOpen_Click);  
            //   
            // mnuFilePrint  
            //   
            this.mnuFilePrint.Index = 3;  
            this.mnuFilePrint.Text = "打印(&P)...";  
            this.mnuFilePrint.Click += new System.EventHandler(this.mnuFilePrint_Click);  
            //   
            // mnuFormat  
            //   
            this.mnuFormat.Index = 1;  
            this.mnuFormat.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] ...{  
                                                                                      this.mnuFormatFont});  
            this.mnuFormat.Text = "格式(&F)";  
            //   
            // mnuFormatFont  
            //   
            this.mnuFormatFont.Index = 0;  
            this.mnuFormatFont.Text = "字體(&O)";  
            this.mnuFormatFont.Click += new System.EventHandler(this.mnuFormatFont_Click);  
            //   
            // dlgOpen  
            //   
            this.dlgOpen.Filter = "文本文件|*.txt|所有文件|*.*";  
            //   
            // pdoc  
            //   
            this.pdoc.DocumentName = "abc";  
            this.pdoc.BeginPrint += new System.Drawing.Printing.PrintEventHandler(this.pdoc_BeginPrint);  
            this.pdoc.EndPrint += new System.Drawing.Printing.PrintEventHandler(this.pdoc_EndPrint);  
            this.pdoc.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(this.pdoc_PrintPage);  
            //   
            // mnuFilePrintPreview  
            //   
            this.mnuFilePrintPreview.Index = 2;  
            this.mnuFilePrintPreview.Text = "打印預覽...";  
            this.mnuFilePrintPreview.Click += new System.EventHandler(this.mnuFilePrintPreview_Click);  
            //   
            // mnuFilePageSetup  
            //   
            this.mnuFilePageSetup.Index = 1;  
            this.mnuFilePageSetup.Text = "頁面設置...";  
            this.mnuFilePageSetup.Click += new System.EventHandler(this.mnuFilePageSetup_Click);  
            //   
            // ppd  
            //   
            this.ppd.AutoScrollMargin = new System.Drawing.Size(0, 0);  
            this.ppd.AutoScrollMinSize = new System.Drawing.Size(0, 0);  
            this.ppd.ClientSize = new System.Drawing.Size(400, 300);  
            this.ppd.Document = this.pdoc;  
            this.ppd.Enabled = true;  
            this.ppd.Icon = ((System.Drawing.Icon)(resources.GetObject("ppd.Icon")));  
            this.ppd.Location = new System.Drawing.Point(317, 17);  
            this.ppd.MinimumSize = new System.Drawing.Size(375, 250);  
            this.ppd.Name = "ppd";  
            this.ppd.TransparencyKey = System.Drawing.Color.Empty;  
            this.ppd.Visible = false;  
            //   
            // dlgPageSetup  
            //   
            this.dlgPageSetup.Document = this.pdoc;  
            //   
            // dlgPrinterSetup  
            //   
            this.dlgPrinterSetup.Document = this.pdoc;  
            //   
            // DemoForm  
            //   
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);  
            this.ClientSize = new System.Drawing.Size(560, 309);  
            this.Controls.Add(this.txtDoc);  
            this.Menu = this.mnuMain;  
            this.Name = "DemoForm";  
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;  
            this.Text = "打印";  
            this.ResumeLayout(false);  
 
        }  
        #endregion  
 
        /**//// <summary>  
        /// 應用程序的主入口點。  
        /// </summary>  
        [STAThread]  
        static void Main()   
        ...{  
            Application.Run(new DemoForm());  
        }  
 
        private void mnuFileOpen_Click(object sender, System.EventArgs e)  
        ...{  
            if (dlgOpen.ShowDialog()==DialogResult.OK)  
            ...{  
                StreamReader sr=null;  
                try 
                ...{  
                    sr=new StreamReader(dlgOpen.FileName,Encoding.Default,true);  
                    txtDoc.Text=sr.ReadToEnd();  
                }  
                catch 
                ...{  
                    MessageBox.Show("打開文件失敗！","錯誤",MessageBoxButtons.OK,MessageBoxIcon.Error);  
                }  
                finally 
                ...{  
                    if (sr!=null) sr.Close();  
                }  
            }  
        }  
 
        private void mnuFormatFont_Click(object sender, System.EventArgs e)  
        ...{  
            dlgFont.Font=txtDoc.Font;  
            if (dlgFont.ShowDialog()==DialogResult.OK)  
            ...{  
                txtDoc.Font=dlgFont.Font;  
            }  
        }  
 
        private void pdoc_BeginPrint(object sender, System.Drawing.Printing.PrintEventArgs e)  
        ...{  
            //MessageBox.Show("開始打印啦");  
        }  
 
        private void pdoc_EndPrint(object sender, System.Drawing.Printing.PrintEventArgs e)  
        ...{  
            //MessageBox.Show("打印結束");  
        }  
 
        private void pdoc_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)  
        ...{  
            Graphics g=e.Graphics;  
            float lineHeight=txtDoc.Font.GetHeight(g);  
            int linesPerPage=(int)(e.MarginBounds.Height/lineHeight);  
            int count=0;  //本頁已打印行數  
 
            while (count<linesPerPage && totalLines<txtDoc.Lines.Length)  
            ...{  
                g.DrawString(txtDoc.Lines[totalLines],txtDoc.Font,Brushes.Black,e.MarginBounds.X,e.MarginBounds.Y+lineHeight*count);  
                count++;  
                totalLines++;  
            }  
 
            if (totalLines<txtDoc.Lines.Length)  
            ...{  
                e.HasMorePages=true;  
            }  
            else 
            ...{  
                e.HasMorePages=false;  
                totalLines=0;  
            }  
        }  
 
        private void mnuFilePrint_Click(object sender, System.EventArgs e)  
        ...{  
            if (dlgPrinterSetup.ShowDialog()==DialogResult.OK)  
            ...{  
                pdoc.Print();  //開始執行打印  
            }  
        }  
 
        private void txtDoc_TextChanged(object sender, System.EventArgs e)  
        ...{  
          
        }  
 
        private void mnuFilePrintPreview_Click(object sender, System.EventArgs e)  
        ...{  
            ppd.ShowDialog();  
        }  
 
        private void mnuFilePageSetup_Click(object sender, System.EventArgs e)  
        ...{  
            Margins oldMargins=dlgPageSetup.PageSettings.Margins;  
            dlgPageSetup.PageSettings.Margins=new Margins((int)(oldMargins.Left*2.54),(int)(oldMargins.Right*2.54),(int)(oldMargins.Top*2.54),(int)(oldMargins.Bottom*2.54));  
            if (dlgPageSetup.ShowDialog()==DialogResult.Cancel)  
            ...{  
                dlgPageSetup.PageSettings.Margins=oldMargins;  
            }  
        }  
    }  
} 

C#打印文件的簡單實例就介紹到這里。

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