<%@ WebHandler Language="C#" Class="Handler" %>

using System;
using System.Web;
using System.Web.Script.Serialization;
using System.IO;

public class Handler : IHttpHandler {
    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "application/json; charset=utf-8"; //"text/plain";
        context.Response.Expires = -1;
        
        var r = new System.Collections.Generic.List<ViewDataUploadFilesResult>();
        JavaScriptSerializer js = new JavaScriptSerializer();
        foreach (string file in context.Request.Files)
        {
            HttpPostedFile hpf = context.Request.Files[file] as HttpPostedFile;
            string FileName = string.Empty;
            if (HttpContext.Current.Request.Browser.Browser.ToUpper() == "IE")
            {
                string[] files = hpf.FileName.Split(new char[] { '\\' });
                FileName = files[files.Length - 1];
            }
            else
            {
                FileName = hpf.FileName;
            }
            if (hpf.ContentLength == 0)
                continue;
            
            string savedFileName = context.Server.MapPath("~/Files/" + FileName);
            hpf.SaveAs(savedFileName);

            r.Add(new ViewDataUploadFilesResult()
            {
                thumbnail_url = savedFileName, //context.Server.MapPath("~/Files/" + FileName), //savedFileName,
                url = savedFileName, //context.Server.MapPath("~/Files/" + FileName),
                name = FileName,
                size = hpf.ContentLength,
                type = hpf.ContentType
            });
            var uploadedFiles = new
            {
                files = r.ToArray()
            };
            var jsonObj = js.Serialize(uploadedFiles);
            //jsonObj.ContentEncoding = System.Text.Encoding.UTF8;
            //jsonObj.ContentType = "application/json;";
            context.Response.Write(jsonObj.ToString());
        }
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

}

public class ViewDataUploadFilesResult
{
    public string thumbnail_url { get; set; }
    public string name { get; set; }
    public int size { get; set; }
    public string type { get; set; }
    public string url { get; set; }
}