下面使用ThoughtWorks.QRCode.dll这个类库，实现生成二维码
使用时需要增加:下面三个命名空间
using ThoughtWorks.QRCode.Codec;
using ThoughtWorks.QRCode.Codec.Data;
using ThoughtWorks.QRCode.Codec.Util;
下面代码主要是在asp.net中，生成一张二维码图片，在网页中显示，而且，将二维码图片保存在了，D：\zlf\zz。png；
C# 代码
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using System; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; using System.Drawing.Imaging; using ThoughtWorks.QRCode.Codec; using ThoughtWorks.QRCode.Codec.Data; using ThoughtWorks.QRCode.Codec.Util; using System.IO; using System.Text; public partial class _Default : System.Web.UI.Page 
{ 
protected void Page_Load(object sender, EventArgs e) 
{ 
} protected void Button1_Click(object sender, EventArgs e) { QRCodeEncoder qrCodeEncoder = new QRCodeEncoder(); qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE; qrCodeEncoder.QRCodeScale = 4; qrCodeEncoder.QRCodeVersion = 8; qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M; //String data = "Hello 二维码！"; String data = TextBox1.Text.ToString(); Response.Write(data); System.Drawing.Bitmap image = qrCodeEncoder.Encode(data); System.IO.MemoryStream MStream = new System.IO.MemoryStream(); image.Save(MStream, System.Drawing.Imaging.ImageFormat.Png); Response.ClearContent(); Response.ContentType = "image/Png"; Response.BinaryWrite(MStream.ToArray()); //FileInfo f = new FileInfo(@"d:\\zl.png"); Directory.CreateDirectory("d:\\\\zlf"); FileStream fs = new FileStream("d:\\\\zlf\\\\zz。png", FileMode.CreateNew, FileAccess.ReadWrite); BinaryWriter bw = new BinaryWriter(fs, UTF8Encoding.UTF8); byte[] by = MStream.ToArray(); for (int i = 0; i < MStream.ToArray().Length; i++) bw.Write(by[i]); fs.Close(); } 
}
aspx页面代码
HTML 代码
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <html> <head runat="server"> <title>无标题页</title> </head> <body> <form id="form1" runat="server"> <div> 请输入内容：<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> <br/> <asp:Button ID="Button1" runat="server" Text="生成二维码" onclick="Button1_Click" /> </div> </form> </body> </html>