Question

I am trying to handle multiple form submissions by writing an ActionFilter. I am new to the domain of ActionFilters and dont know where to start any help will be much appreciated. I have looked at this question but couldnt get a starting point

• 如何处理多份提交书服务器——

Answer 1

我将为此使用反forgery。你们本应该已经产生(如果你愿意易受欧洲常规武装力量的攻击),而且它对于每一种产生的形式都是独特的。

look in form collection for antiforgery token
look into session["LastFormToken"] (or whatever key you like) - if this form (token) already been submitted
if yes, drop the request, if no (form is submitted first time), put it in session (so next time it will be found there and request will be dropped)

Answer 2

http://blogs.sonatribe.com/wayne/201108/15/acceptparaileattribute-update/

我解释了如何形成一种特性,使你能够根据发起提交国名改变目标行动。

Let me know if you need pointers

Answer 3

I would like to suggest an answer. Here is the code

public class ValidateSubmitOnceTokenAttribute : ActionFilterAttribute
{
    public String ErrorView { get; set; }

    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        String submitOnceToken = null;
        submitOnceToken = filterContext.HttpContext.Request[ViewHelper.SubmitOnceIdentifier];
        if ((bool)filterContext.HttpContext.Session[ViewHelper.SubmitOnceIdentifier + submitOnceToken])
        {
            if (String.IsNullOrEmpty(View))
            {
                filterContext.Result = new EmptyResult();
            }
            else
            {
                ViewResult newView = new ViewResult();
                newView.ViewName = ErrorView;
                filterContext.Result = newView;
            }
        }
        else
        {
            filterContext.HttpContext.Session[ViewHelper.SubmitOnceIdentifier + submitOnceToken] = true;
        }
    }
}

public partial class ViewHelper
{
    internal const string SubmitOnceIdentifier = "_SUBMIT_ONCE_";

    public static MvcHtmlString SubmitOnceToken()
    {
        Guid submitOnceToken = Guid.NewGuid();
        HttpContext.Current.Session[SubmitOnceIdentifier + submitOnceToken] = false;
        return new MvcHtmlString("<input type="hidden" name="" + SubmitOnceIdentifier + "" value="" + submitOnceToken.ToString() + "">");
    }
}

之后,你刚刚需要将这一属性纳入你的方法。

    [ValidateSubmitOnceToken(View="ErrorSubmitOnce")]
    public ActionResult MyAction(Model) {
        ....
    }

并将此纳入你的看法

    @ViewHelper.SubmitOnceOnlyToken()

这一答案使用Aliostad描述的技术,但使用行动过滤器实施。

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