/*修改头像*/      //上传      function _sc() {          $(".ckfile").html("").css("color", "#535353");          $("#_userImgPath").val("");          var str = $("#file").val();          if ($.trim(str) == "") {              $(".ckfile").html("请选择文件。").css("color", "red");              return false;          }          else {              var postfix = str.substring(str.lastIndexOf(".") + 1).toUpperCase();              if (postfix == "JPG" || postfix == "JPEG" || postfix == "PNG" || postfix == "GIF" || postfix == "BMP") {                  $('#showimg').attr('src', 'Images/loading.gif').attr("title", "上传中，请稍后…");                  var path = "Upload/UserImg";                  $.ajaxFileUpload({                      url: '/Upload.aspx?path=Upload|UserImg&shape=100*100',                      secureuri: false,                      fileElementId: 'file',                      dataType: 'text',                      success: function (msg) {                          if (msg.lastIndexOf(path) == -1) {                              $(".ckfile").html(msg).css("color", "red");                          }                          else {                              $('#showimg').attr('src', msg).attr("title", "我的头像");                              $("#_userImgPath").val(msg);                          }                      }                  });              } else {                  $(".ckfile").html("文件格式错误。").css("color", "red");                  return false;              }          }      } 

using System;  using System.Collections.Generic;  using System.Linq;  using System.Web;  using System.Web.UI;  using System.Web.UI.WebControls;  using SS.Upload;  using WFC.Fenxiao;  namespace wanfangcheng  {      public partial class Upload : BasePage      {          //文件大小 1024 kb          private long size = 1024;          //文件类型          private string type = ".jpg|.jpeg|.png|.gif|.bmp";          //保存名称          string name = "";          //保存路径          private string path = @"Upload/UserImg";          //保存大小          private string shape = "100*100";          protected void Page_Load(object sender, EventArgs e)          {              HttpFileCollection files = Request.Files;              if (files != null && files.Count > 0)              {                  name = BaseRole.Instance.UserId.ToString();                  if (Request.QueryString["size"] != null)                  {                      size = Convert.ToInt32(Request.QueryString["size"]);                  }                  if (Request.QueryString["path"] != null)                  {                      path = Request.QueryString["path"].ToString().Trim().Replace('|', '/');                  }                  if (Request.QueryString["name"] != null)                  {                      name = Request.QueryString["name"].ToString().Trim();                  }                  if (Request.QueryString["shape"] != null)                  {                      shape = Request.QueryString["shape"].ToString().Trim();                  }                  uploadMethod(files);              }          }          /// <summary>          /// 上传图片          /// </summary>          /// <param name="hc"></param>          public void uploadMethod(HttpFileCollection hc)          {              HttpPostedFile _file = hc[0];              //文件大小              long _size = _file.ContentLength;              if (_size <= 0)              {                  Response.Write("文件错误。");                  Response.End();                  return;              }              if (size * 1024 < _size)              {                  Response.Write("文件过大,最大限制为" + size + "KB。");                  Response.End();                  return;              }              //文件名              string _name = _file.FileName;              //文件格式              string _tp = System.IO.Path.GetExtension(_name).ToLower();              if (type.IndexOf(_tp) == -1)              {                  Response.Write("文件格式错误。");                  Response.End();                  return;              }              //保存路径              string _path = HttpContext.Current.Server.MapPath(path) + @"/" + name + _tp;              try              {                  int w = Convert.ToInt32(shape.Split('*')[0]);                  int h = Convert.ToInt32(shape.Split('*')[1]);                  ImageHelper.CutForCustom(_file, _path, w, h, 50);                  Response.Write(path + @"/" + name + _tp);              }              catch (Exception)              {                  Response.Write("哎呦，出错了。");                  Response.End();              }          }      }  }