C#简单实现文件上传功能

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.IO;using System.Web.Security;namespace AL.Web { /// <summary> /// Upload 的摘要说明 /// </summary> public class Upload : IHttpHandler {  public void ProcessRequest(HttpContext context) {   context.Response.ContentType = "text/plain";   //context.Response.Write("Hello World");   string r = "";   //此处有时候穿过来的sn后面还有一些乱七八糟的字符，没研究什么意思，就判断一下，截取一下就完事了，小项目~   string sn = context.Request.QueryString["sn"];   if (sn != null && sn.Length > 14) sn = sn.Substring(0, 14);   if (context.User.Identity.IsAuthenticated == false) {    // 未登录用户       }   try {    //获取上传的文件数据    HttpPostedFile file = context.Request.Files["Filedata"];    string fileName = file.FileName;    string fileType = Path.GetExtension(fileName).ToLower();    //由于不同浏览器取出的FileName不同（有的是文件绝对路径，有的是只有文件名），故要进行处理    if (fileName.IndexOf(' ') > -1) {     fileName = fileName.Substring(fileName.LastIndexOf(' ') + 1);    } else if (fileName.IndexOf('/') > -1) {     fileName = fileName.Substring(fileName.LastIndexOf('/') + 1);    }    //上传的目录    string uploadDir = "~/Content/uploadfile/TMP/" + System.DateTime.Now.ToString("yyyyMM") + "/";    //上传的路径    //生成年月文件夹及日文件夹    if (Directory.Exists(context.Server.MapPath(uploadDir)) == false) {     Directory.CreateDirectory(context.Server.MapPath(uploadDir));    }    if (Directory.Exists(context.Server.MapPath(uploadDir + System.DateTime.Now.ToString("dd") + "/")) == false) {     Directory.CreateDirectory(context.Server.MapPath(uploadDir + System.DateTime.Now.ToString("dd") + "/"));    }    uploadDir = uploadDir + System.DateTime.Now.ToString("dd") + "/";    string uploadPath = uploadDir + FormsAuthentication.HashPasswordForStoringInConfigFile(fileName, "MD5").Substring(0, 8) + fileType;    //保存文件    file.SaveAs(context.Server.MapPath(uploadPath));    //下面这句代码缺少的话，上传成功后上传队列的显示不会自动消失    //DbHelperOleDb.ExecuteSql("insert into [temp](temp_sn,temp_Content) values('" + sn + "','" + uploadPath + "')");    //Response.Write("1");    //context.Response.Write("{'IsError':false, 'Data':'" + uploadPath + "'}");    r = "{'IsError':false, 'Data':'" + uploadPath + "'}";   } catch (Exception ex) {    //Response.Write("0");    //throw ex;    //context.Response.Write("{IsError: true, data:'" + ex.Message + "'}");    r = "{'IsError':true, 'Data':'" + ex.Message + "'}";   } finally {    r = r.Replace("'", "/"");    context.Response.Write(r);    context.Response.End();   }  }  public bool IsReusable {   get {    return false;   }  } }}