MVC3 Html.BeginForm - 传递参数的RouteValueDictionary失败 [英] MVC3 Html.BeginForm - passing arguments as RouteValueDictionary fails

问题描述

我有一个多步骤的安装过程中，我想通过追加到，只有当他们是相关的URL查询字符串参数。

<一个href=\"http://localhost:6618/Account/Profile?wizard=true&cats=dogs\">http://localhost:6618/Account/Profile?wizard=true&cats=dogs

@using（Html.BeginForm（））

伟大的工作。它产生：＆LT;形式的行动=/帐号/个人设置=真放大器;放大器;猫=狗？的方法=后＆GT; 即它传递到POST行动的任何原始查询串参数，然后在该控制器的动作，我可以选择哪些是相关传递到我的下一个步骤，或需要增加，通过向RouteValues​​和RedirectToResult。

不过，我需要一个类分配给我的表格样式的目的。

我试过：

@using（Html.BeginForm（档案，帐户，指定参数时，FormMethod.Post，新{@class =的MainForm}））

这将产生：

＆LT;形式action=\"/Account/Profile?Count=1&Keys=System.Collections.Generic.Dictionary%602%2BKeyCollection%5BSystem.String%2CSystem.Object%5D&Values=System.Collections.Generic.Dictionary%602%2BValueCollection%5BSystem.String%2CSystem.Object%5D\"类=MainForm的方法=后＆GT;

（ ARGS 是由过滤器生成的，并且是一个RouteValueDictionary）。该规范<一个href=\"http://msdn.microsoft.com/en-us/library/dd505151.aspx\">http://msdn.microsoft.com/en-us/library/dd505151.aspx表明你可以传递参数与System.Web.Routing.RouteValueDictionary。

我要的是＆LT;形式的行动=/帐号/个人设置=真放大器;放大器;猫=狗类=MainForm的方法=后＆GT;

我要提到我会preFER不会做这样的事情传递新{键=值} 来代替，因为有相当数量的逻辑来判断我将沿着下一个步骤路过。

什么任何建议在这里做？

我对这个看似简单的任务受阻，而且我肯定失去了一些东西非常明显。

解决方案

  

args在由滤波器产生的，并且是一个RouteValueDictionary

这是这里的关键点。在这种情况下，确保您使用的是正确超载：

  @using（Html.BeginForm（
    简介，
    帐户，
    ARGS，
    FormMethod.Post，
    新RouteValueDictionary（新{@class =的MainForm}）
））
{
    ...
}
 

注意最后一个参数？它必须是一个的IDictionary＆LT;字符串对象＆gt; 这个工作

在您的例子是此重载是被拾起。但既然你是传递一个 RouteValueDictionary 为routeValues​​参数，而不是它被搞砸了一个匿名对象。

那么，您应该同时拥有routeValues​​和htmlAttributes如字典或两个匿名对象。

I have a multi-step setup process where I would like to pass query string arguments appended to the URL only if they are relevant.

http://localhost:6618/Account/Profile?wizard=true&cats=dogs

@using( Html.BeginForm() )

worked great. It yielded: <form action="/Account/Profile?setup=true&amp;cats=dogs" method="post"> i.e. it passed into the POST action any of the original query string parameters, and then in that Controller action I could chose which ones were relevant to pass to my next step, or necessary to add, by adding to the RouteValues and a RedirectToResult.

However, I need to assign a class to my form for styling purposes.

I tried:

@using( Html.BeginForm( "Profile", "Account", args, FormMethod.Post, new { @class = "mainForm" } ) )

which yields:

<form action="/Account/Profile?Count=1&amp;Keys=System.Collections.Generic.Dictionary%602%2BKeyCollection%5BSystem.String%2CSystem.Object%5D&amp;Values=System.Collections.Generic.Dictionary%602%2BValueCollection%5BSystem.String%2CSystem.Object%5D" class="mainForm" method="post">

(args was generated by a filter, and is a RouteValueDictionary). The specification http://msdn.microsoft.com/en-us/library/dd505151.aspx indicates that you can pass arguments with a System.Web.Routing.RouteValueDictionary.

What I want is <form action="/Account/Profile?setup=true&amp;cats=dogs" class="mainForm" method="post">

I should mention I would prefer not to do something like passing in new {key = value} instead, since there is a fair amount of logic to determine what I will be passing along to the next step.

Any suggestions on what to do here?

I am stymied by this seemingly simple task, and am surely missing something terribly obvious.

解决方案

args was generated by a filter, and is a RouteValueDictionary

That's the key point here. In this case make sure you are using the correct overload of the BeginForm method:

@using(Html.BeginForm(
    "Profile", 
    "Account",   
    args, 
    FormMethod.Post, 
    new RouteValueDictionary(new { @class = "mainForm" })
))
{
    ...
}

Notice the last argument? It must be an IDictionary<string, object> for this to work.

In your example it is this overload that gets picked up. But since you are passing a RouteValueDictionary for the routeValues parameter instead of an anonymous object it gets messed up.

So, you should either have both routeValues and htmlAttributes as dictionaries or both as anonymous objects.

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