对于字典和LT隐藏的输入，串，串＆GT;在ASP.NET MVC 3 [英] Hidden input for Dictionary<string, string> in ASP.NET MVC 3

问题描述

我需要在后的行动我的模型属性，因此需要为他们隐藏的元素，但我有键入的问题词典＆LT;字符串，字符串＆GT; 。这是我的模型：

I need to get my model properties in Post action, so need to hidden element for them, but I have a problem with type of Dictionary <string, string>. this is My model:

public class ViewModel{
 ...
 public ViewPart ViewPart { get; set; }
}

public class ViewPart {
 ...
 public Dictionary<string, string> Flags { get; set; }
}

和我的控制器：

Dictionary<string, string> flags = new Dictionary<string, string>();
flags.Add("kind", "Edit");
flags.Add("Command", "Save");
ViewModel model = new ViewModel(){ Flags  = flags };
return View(model);

在View：

@foreach(var item in Model.ViewPart.Flags) { 
 <input type="hidden" id="ViewPart_Flags_@(item.Key)" value="@item.Value" name="ViewPart.Flags[@(item.Key)]" />
}

我也试试这个：

@foreach(var item in Model.ViewPart.Flags) { 
  @Html.HiddenFor(modelItem => item)
}

更新
帖子动作：

[HttpPost]
public ActionResult MyPostAction(ViewModel model){
  //model.ViewPart.Flags is null
}

但在行动后的标记总是空的，为什么？哪里是我的错吗？有没有更好的方式来传递从视图变量给动作？

But in Post action the Flags is Always null, why? where is my fault? Is there any better way to pass variables from View To Action?

推荐答案

您需要两个隐藏字段一个是键，一个用于值如果你想modelbind字典：

You need two hidden fields one for the Key and one for the Value if you want to modelbind to a dictionary:

var index = 0;
foreach (var item in Model.ViewPart.Flags)
{

    <input type="hidden" value="@item.Key" 
                         name="ViewPart.Flags[@(index)].Key"/>
    <input type="hidden" value="@item.Value" 
                         name="ViewPart.Flags[@(index)].Value"/>

    index++;
}
    <input type="submit" value="Save"/>

请注意，您将还需要一个正在运行的指标，使模型绑定开心。

Note, you will be also need a running index to make the model binder happy.

或者，如果你不希望有一个正在运行的，你可以用一个addtional隐藏首页字段解决：

Or if you don't want to have a running you can solve with an addtional hidden Index field:

foreach (var item in Model.ViewPart.Flags)
{

    <input type="hidden" value="@item.Key" 
                         name="ViewPart.Flags.Index"/>
    <input type="hidden" value="@item.Key" 
                         name="ViewPart.Flags[@(item.Key)].Key" />
    <input type="hidden" value="@item.Value" 
                         name="ViewPart.Flags[@(item.Key)].Value" />
}
    <input type="submit" value="Save"/>
}

您可以找到大量的信息关于这个两篇文章与收藏modelbinding：

You can find a lots of info about modelbinding with collections in this two article:

• ASP.NET电线格式模型绑定到数组，列表，集合，字典


• 模型绑定到一个List

• ASP.NET Wire Format for Model Binding to Arrays, Lists, Collections, Dictionaries
• Model Binding To A List

这篇关于对于字典和LT隐藏的输入，串，串＆GT;在ASP.NET MVC 3的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！