.net文件上传，客户端用jquery file upload

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<%@ WebHandler Language="C#" Class="Handler" %>using System;using System.Web;using System.IO;public class Handler : IHttpHandler {    /// <summary>    /// 上传文件夹    /// </summary>    private const string UPLOAD_FOLDER = "~/UploadFile/";    public void ProcessRequest(HttpContext context)    {        int resultVal = (int)ReturnVal.Failed;        try        {            HttpPostedFile myFile = context.Request.Files[0];            if (myFile != null)            {                if (myFile.InputStream.Length != 0)                {                    string originalFileName = Path.GetFileName(myFile.FileName);     //原文件名                                            string newFileName = string.Format("{0}_{1}", Guid.NewGuid(), originalFileName);   //新文件名---组成形式：  GUID + 下划线 + 原文件名                    string fileAbsPath = context.Server.MapPath(UPLOAD_FOLDER) + newFileName;   //绝对路径                    myFile.SaveAs(fileAbsPath);                    resultVal = (int)ReturnVal.Succeed;                }                else                {                    resultVal = (int)ReturnVal.FileEmpty;                }            }            else            {                resultVal = (int)ReturnVal.NotSelected;            }        }        catch (Exception)        {            resultVal = (int)ReturnVal.Failed;        }        finally        {            context.Response.Write(resultVal);        }    }    #region## 返回值    /// <summary>    /// 返回值    /// </summary>    private enum ReturnVal : int    {        /// <summary>        /// 不能上传 0 K大小的文件        /// </summary>        FileEmpty = -2,        /// <summary>        /// 未选中文件        /// </summary>        NotSelected = -1,        /// <summary>        /// 上传失败        /// </summary>        Failed = 0,        /// <summary>        /// 成功        /// </summary>        Succeed = 1    }    #endregion    public bool IsReusable    {        get        {            return false;        }    }}
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