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【Asp.Net】 asp.net mvc 防止重复提交
作者:Dezai.CN / 发布于2013/6/12/ 645

	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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