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【Asp.Net】 mvc 防止重复提交

作者:无形 / 发布于2014/4/11/ 555

public class NoResubmitAttribute : ActionFilterAttribute
  {
    private static readonly string HttpMehotdPost = "POST";
    private static readonly string prefix = "postFlag";
    private string nameWithRoute;

    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
      var controllerContext = filterContext.Controller.ControllerContext;
      if (!controllerContext.IsChildAction)
      {
        var request = controllerContext.HttpContext.Request;
        var session = controllerContext.HttpContext.Session;
        nameWithRoute = generateNameWithRoute(controllerContext);
        int sessionFlag = session[nameWithRoute] == null ? 0 : (int)session[nameWithRoute];
        int requestFlag = string.IsNullOrEmpty(request.Form[nameWithRoute]) ? 0 : int.Parse(request.Form[nameWithRoute]);
        // get or normal post: true;  
        bool isValid = !IsPost(filterContext) || sessionFlag == requestFlag;
        if (sessionFlag == int.MaxValue)
        {
          sessionFlag = -1;
        }
        session[nameWithRoute] = ++sessionFlag;
        if (!isValid)
        {
          filterContext.Result = new RedirectResult(GenerateUrlWithTimeStamp(request.RawUrl));
          return;
        }
      }
      base.OnActionExecuting(filterContext);
    }

    private string GenerateUrlWithTimeStamp(string url)
    {
      return string.Format("{0}{1}timeStamp={2}", url, url.Contains("?") ? "&" : "?", (DateTime.Now - DateTime.Parse("2010/01/01")).Ticks);
    }

    private bool IsPost(ActionExecutingContext filterContext)
    {
      return filterContext.HttpContext.Request.HttpMethod == HttpMehotdPost;
    }

    private string generateNameWithRoute(ControllerContext controllerContext)
    {
      StringBuilder sb = new StringBuilder(prefix);
      foreach (object routeValue in controllerContext.RouteData.Values.Values)
      {
        sb.AppendFormat("_{0}", routeValue);
      }
      return sb.ToString();
    }

    public override void OnResultExecuted(ResultExecutedContext filterContext)
    {
      base.OnResultExecuted(filterContext);
      if (!filterContext.IsChildAction && !(filterContext.Result is RedirectResult))
      {
        //string format = "<script type='text/javascript'>$(function () [[ $('form').each(function()[[$('<input type=hidden id={0} name={0} value={1} />').appendTo($(this));]])]]); </script>";
        string format = "<script type='text/javascript'> var forms = document.getElementsByTagName('form'); for(var i = 0; i<forms.length; i++)[[var ele = document.createElement('input'); ele.type='hidden'; ele.id=ele.name='{0}'; ele.value='{1}'; forms[i].appendChild(ele);]] </script>";
        string script = string.Format(format, nameWithRoute, filterContext.HttpContext.Session[nameWithRoute]).Replace("[[", "{").Replace("]]", "}");
        filterContext.HttpContext.Response.Write(script);
      }
    }
  }



[HttpGet]
    [NoResubmit]
    public ActionResult Index()
    {
      return View();
    }

    [HttpPost]
    [NoResubmit]
    public ActionResult Index(int id)
    {
      return View();
    }

    [NoResubmit]
    public ActionResult About()
    {
      return View();
    }

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