Editor.Md - upload image using asp.net

uploadimage.ashx.cs

using System;
using System.IO;
using System.Web;
using System.Web.Script.Serialization;

namespace MDEditorUploadImage
{

    public class uploadimage : IHttpHandler
    {

        public class ResultInfo
        {
            public int success { get; set; }
            public string message { get; set; }
            public string url { get; set; }
        }


        public void ProcessRequest(HttpContext context)
        {
            try
            {

                //儲存路徑
                DirectoryInfo FileDir = new DirectoryInfo(System.AppDomain.CurrentDomain.BaseDirectory.ToString() + "source\\");

                //如果檔案夾沒有建立則自行建立
                if (FileDir.Exists == false)
                {
                    FileDir.Create();
                }

                HttpFileCollection uploadedFiles = context.Request.Files;

                if (uploadedFiles.Count > 0)
                {
                    HttpPostedFile userPostedFile = uploadedFiles[0];

                    if (userPostedFile.ContentLength > 0)
                    {
                        userPostedFile.SaveAs(System.AppDomain.CurrentDomain.BaseDirectory.ToString() + "source" + Path.DirectorySeparatorChar + Path.GetFileName(userPostedFile.FileName));
                        context.Response.Write(new JavaScriptSerializer().Serialize(new ResultInfo { message = "上傳成功", success = 1, url = "http://"+context.Request.Url.Authority + "/source/" + Path.GetFileName(userPostedFile.FileName) }));
                    }
                }

               
            }
            catch (Exception ex)
            {
                context.Response.Write(new JavaScriptSerializer().Serialize(new ResultInfo { message = "上傳失敗:"+ex.Message, success = 0, url ="" }));
            }
        }

       
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}