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源码地址：

打印效果图：

我把打印的参数基本都封装到一个类里面，直接调用即可，可打印文字也可打印图片

首先安装打印机驱动，然后在设备和打印机中将要用的打印机设为默认打印机，然后调用该方法即可

Pulic Void Print(){    PrintService ps = new PrintService();    //ps.StartPrint("33333","txt");//打印文字    ps.StartPrint(WriteTxt(),"txt");    ps.StartPrint(Image.FromFile(Application.StartupPath+"\\2.jpeg"), "image");//打印图片}

WriteTxt方法就是拼接要打印的字符串

public string WriteTxt(){    StringBuilder sb = new StringBuilder();    string tou = "伊尹餐饮公司";    string address = "深圳市罗湖区东门老街29号";    string saleID = "2010930233330";    string item = "项目";    decimal price = 25.00M;    int count = 5;    decimal total = 0.00M;    decimal fukuan = 500.00M;    sb.Append("            " + tou + "     \r\n");    sb.Append("-----------------------------------------------------------------\r\n");    sb.Append("日期:" + DateTime.Now.ToShortDateString() + "  " + "单号:" + saleID + "\r\n");    sb.Append("-----------------------------------------------------------------\r\n");    sb.Append("项目" + "\t\t" + "数量" + "\t" + "单价" + "\t" + "小计" + "\r\n");    for (int i = 0; i < count; i++)    {        decimal xiaoji = (i + 1) * price;        sb.Append(item + (i + 1) + "\t\t" + (i + 1) + "\t" + price + "\t" + xiaoji);        total += xiaoji;        if (i != (count))            sb.Append("\r\n");    }    sb.Append("-----------------------------------------------------------------\r\n");    sb.Append("数量: " + count + " 合计:   " + total + "\r\n");    sb.Append("付款: 现金" + "    " + fukuan);    sb.Append("         现金找零:" + "   " + (fukuan - total) + "\r\n");    sb.Append("-----------------------------------------------------------------\r\n");    sb.Append("地址：" + address + "\r\n");    sb.Append("电话：123456789   123456789\r\n");    sb.Append("                 谢谢惠顾欢迎下次光临                    ");    return sb.ToString();}

PrintService类源码，在这个类中可以改变是否打印弹窗确认，字体类型，大小，打印位置设置

using System;using System.Collections.Generic;using System.Drawing;using System.Drawing.Printing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace 小票打印{    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 string streamType;        private string streamtxt;        private Image streamima;        // This method will set properties on the PrintDialog object and        // then display the dialog.        public void StartPrint(string txt, string streamType)        {            this.streamType = streamType;            this.streamtxt = txt;            // Allow the user to choose the page range he or she would            // like to print.            System.Windows.Forms.PrintDialog PrintDialog1 = new PrintDialog();//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,如果不要注释即可，直接调用docToPrint.Print()             If the result is OK then print the document.            //if (result == DialogResult.OK)            //{            //    docToPrint.Print();//开始打印            //}            docToPrint.Print();//开始打印        }        public void StartPrint(Image ima, string streamType)        {            this.streamType = streamType;            this.streamima = ima;            // Allow the user to choose the page range he or she would            // like to print.            System.Windows.Forms.PrintDialog PrintDialog1 = new PrintDialog();//创建一个PrintDialog的实例。            PrintDialog1.AllowSomePages = true;            // Show the help button.            PrintDialog1.ShowHelp = true;            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,如果不要注释即可，直接调用docToPrint.Print()            // If the result is OK then print the document.            if (result == DialogResult.OK)            {                docToPrint.Print();//开始打印            }            //docToPrint.Print();//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", 7, System.Drawing.FontStyle.Regular);//在这里设置打印字体以及大小                    // Draw the content.                    text = streamtxt;                    //e.Graphics.DrawString(text, printFont, System.Drawing.Brushes.Black, e.MarginBounds.X, e.MarginBounds.Y);                    e.Graphics.DrawString(text, printFont, System.Drawing.Brushes.Black, 0, 10);//设置打印初始位置                    break;                case "image":                    System.Drawing.Image image = streamima;                    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;            }        }    }}

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