这期内容当中小编将会给大家带来有关C#中怎么实现打印功能，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。
C#实现打印功能具体的操作步骤如下：
创建一个PrintDialog的实例。如下：
System.Windows.Forms.PrintDialog PrintDialog1=new PrintDialog ();创建一个PrintDocument的实例.如下：
System.Drawing.Printing.PrintDocument docToPrint = new System.Drawing.Printing.PrintDocument();设置打印机开始打印的事件处理函数.函数原形如下：
void docToPrint_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)将事件处理函数添加到PrintDocument的PrintPage事件中。
docToPrint.PrintPage+= new PrintPageEventHandler(docToPrint_PrintPage);设置PrintDocument的相关属性，如：
PrintDialog1.AllowSomePages = true;PrintDialog1.ShowHelp = true;把PrintDialog的Document属性设为上面配置好的PrintDocument的实例：
PrintDialog1.Document = docToPrint;调用PrintDialog的ShowDialog函数显示打印对话框：
DialogResult result = PrintDialog1.ShowDialog();根据用户的选择，开始打印：
if (result==DialogResult.OK) { docToPrint.Print(); }C#实现打印功能的实例如下：
使用时先创建PrintService类的实例，然后调用void StartPrint(Stream streamToPrint,string streamType)函数开始打印。其中streamToPrint是要打印的内容（字节流），streamType是流的类型（txt表示普通文本，image表示图像）；
using System; using System.Drawing.Printing; using System.Windows.Forms; using System.IO; namespace EDImageSystem { /// <summary> /// PrintService 的摘要说明。 /// </summary> public class PrintService { public PrintService() { // // TODO: 在此处添加构造函数逻辑 // this.docToPrint.PrintPage+= new PrintPageEventHandler(docToPrint_PrintPage); }//将事件处理函数添加到PrintDocument的PrintPage中 // Declare the PrintDocument object. private System.Drawing.Printing.PrintDocument docToPrint = new System.Drawing.Printing.PrintDocument(); //创建一个PrintDocument的实例 private System.IO.Stream streamToPrint; string streamType; // This method will set properties on the PrintDialog object and // then display the dialog. public void StartPrint(Stream streamToPrint,string streamType) { this.streamToPrint=streamToPrint; this.streamType=streamType; // Allow the user to choose the page range he or she would // like to print. System.Windows.Forms.PrintDialog PrintDialog1= new PrintDialog ();//实现C#打印之创建一个PrintDialog的实例。 PrintDialog1.AllowSomePages = true; // Show the help button. PrintDialog1.ShowHelp = true; // Set the Document property to the PrintDocument for // which the PrintPage Event has been handled. To display the // dialog, either this property or the PrinterSettings property // must be set PrintDialog1.Document = docToPrint; //把PrintDialog的Document属性设为上面配置好的PrintDocument的实例 DialogResult result = PrintDialog1.ShowDialog(); //调用PrintDialog的ShowDialog函数显示打印对话框 // If the result is OK then print the document. if (result==DialogResult.OK) { docToPrint.Print();//实现C#打印之开始打印 } } // The PrintDialog will print the document // by handling the document's PrintPage event. private void docToPrint_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e) //设置打印机开始打印的事件处理函数 { // Insert code to render the page here. // This code will be called when the control is drawn. // The following code will render a simple // message on the printed document switch(this.streamType) { case "txt": string text = null; System.Drawing.Font printFont = new System.Drawing.Font ("Arial", 35, System.Drawing.FontStyle.Regular); // Draw the content. System.IO.StreamReader streamReader= new StreamReader(this.streamToPrint); text=streamReader.ReadToEnd(); e.Graphics.DrawString(text,printFont, System.Drawing.Brushes.Black,e.MarginBounds.X,e.MarginBounds.Y); break; case "image": System.Drawing.Image image= System.Drawing.Image.FromStream(this.streamToPrint); int x=e.MarginBounds.X; int y=e.MarginBounds.Y; int width=image.Width; int height=image.Height; if((width/e.MarginBounds.Width)>( height/e.MarginBounds.Height)) { width=e.MarginBounds.Width; height=image.Height*e.MarginBounds.Width/image.Width; } else { height=e.MarginBounds.Height; width=image.Width*e.MarginBounds.Height/image.Height; } System.Drawing.Rectangle destRect= new System.Drawing.Rectangle(x,y,width,height); e.Graphics.DrawImage(image, destRect,0,0,image.Width,image.Height, System.Drawing.GraphicsUnit.Pixel); break; default: break; } } } }上述就是小编为大家分享的C#中怎么实现打印功能了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注编程网行业资讯频道。
