cordova 选择图片并上传到服务器

<%@ Page Language="C#"Inherits="com.jtys114.Sport.AdminWebUI.Core.PageBase" %>
<%@ Import Namespace="System.Linq" %>
<%@ Import Namespace="com.jtys114.Sport.AdminWebUI.Core" %>
<%@ Import Namespace="com.jtys114.Sport.Util" %>
<%@ Import Namespace="com.jtys114.Sport.EFModel" %>
<%@ Import Namespace="System.Text.RegularExpressions" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="F.Studio.Web.Utility" %>
<%@ Import Namespace="System.IO" %>
<script runat="server">

static readonly string C_FileRoot = "/Files/";
private bool UseEscape = false;//是否对字符进行escape编码
private String CallBack = ""; //

protected override void CheckPageAccessAuth()
{

return;
}
private void WriteJson(object v)
{
var o = new { result = v };
Response.Write(string.Format("{0}({1})", CallBack, JSONhelper.ToJson(o, UseEscape)));
}
protected void Page_Load(object sender, EventArgs e)
{
Response.ContentType = "text/json";
Response.Expires = -1;
try
{
UseEscape = TryParser<bool>(Request["es"], false);
CallBack = Request["callback"];

if (Request.Files.Count <= 0) throw new Exception("没有文件上传!");

var response= SaveFile();

WriteJson(response);

}
catch (Exception ex)
{
WriteJson(new { Msg = ex.Message, Code = -1 });
}
Response.End();

}

private UploadResponse SaveFile()
{

var file = Request.Files[0];
var ext = Path.GetExtension(file.FileName);

//确保目录存在
string path = C_FileRoot + DateTime.Now.ToString("yyyy-MM-dd") + "/";

if (!Directory.Exists(System.Web.Hosting.HostingEnvironment.MapPath(path)))
{
Directory.CreateDirectory(System.Web.Hosting.HostingEnvironment.MapPath(path));
}
//合成文件名
var filename = path + Guid.NewGuid().ToString("N").Substring(0, 8) + ext;

var resp = new UploadResponse();
resp.MIME = file.ContentType;
resp.Size = file.ContentLength / 1024;

resp.Name = StringHelper.Escape(Path.GetFileNameWithoutExtension(file.FileName));
resp.Path = StringHelper.Escape(filename);
resp.Code = 200;
resp.Msg = "Success";

using (var ctx = DBCtx.GetCtx())
{
var ent = new Sys_Files();
ent.AddTime = DateTime.Now;
ent.CatalogId = Util.GetQ<int>(Request, "dirNo", -1);
ent.FileSize = resp.Size;
ent.IsDeleted = false;
ent.Name = resp.Name;
ent.Path = resp.Path;

ctx.Sys_Files.AddObject(ent);
ctx.SaveChanges();

resp.FileId = ent.DocId;
}

//保持文件
file.SaveAs(System.Web.Hosting.HostingEnvironment.MapPath(filename));

return resp;
}