@ Html.HiddenFor在ASP.NET MVC列表不起作用 [英] @Html.HiddenFor does not work on Lists in ASP.NET MVC

问题描述

我使用一个包含列表作为属性的模型。我填充这个名单与我从SQL Server抢项目。我想要列表隐藏在视图中，并传递到POST操作。后来我可能要更多的项目添加到这个列表与jQuery这使得不适合扩张以后的数组。通常你会使用

I'm using a model that contains a List as a property. I'm populating this list with items I grab from SQL Server. I want the List to be hidden in the view and passed to the POST action. Later on I may want to add more items to this List with jQuery which makes an array unsuitable for expansion later on. Normally you would use

@ Html.HiddenFor（型号=> model.MyList）

@Html.HiddenFor(model => model.MyList)

要实现该功能，但由于某种原因在POST列表始终为空。

to accomplish this functionality, but for some reason the List in POST is always null.

很简单的问题，任何人都知道为什么MVC的行为就像这样？

Very simple question, anyone know why MVC behaves like this?

推荐答案

我刚刚遇到这个问题，并解决它简单地通过执行以下操作：

I've just come across this issue and solved it simply by doing the following:

for(int i = 0; i < Model.ToGroups.Count; i++)
{
    @Html.HiddenFor(model => Model.ToGroups[i])
}

通过使用了，而不是一个foreach模型结合将正常工作，拿起所有的隐藏值的列表。好像要解决这个问题的最简单的方法。

By using a for instead of a foreach the model binding will work correctly and pick up all of your hidden values in the list. Seems like the simplest way to solve this problem.

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