MVC DropDownListFor不选择从模型值 [英] MVC DropDownListFor not selecting value from model

问题描述

我曾经使用过此问题<读href=\"http://stackoverflow.com/questions/11042660/asp-net-mvc-dropdownlistfor-not-selecting-value-from-model\">ASP.NET MVC DropDownListFor不选择从模型和回答的价值，但我不知道解决我的问题。

这是我的看法：

  @foreach（在Model.adjusterLanguages​​ VAR adjusterLanguages​​）
{
    ＆LT; D​​IV CLASS =主编场行＆GT;
        @ Html.DropDownListFor（型号=＆GT; Model.adjusterLanguages​​ [I] .languageID，
                              （的SelectList）ViewBag.ForeignLanguages​​）
        @ Html.ValidationMessageFor（型号=＆GT; Model.adjusterLanguages​​ [I] .languageID）
    ＆LT; / DIV＆GT;    ＆LT; D​​IV的风格=明确：左;＆GT;＆LT; / DIV＆GT;    我++;
}
 

我可以证实，该模型数据被填充（从我的控制器）：

  model.adjusterLanguages​​ = adjLangs;
 

所以，我怎样才能让它在选择项目时，该模型被发送到视图？

编辑：

生成的HTML如下：

 ＆LT; D​​IV CLASS =主编场行＆GT;
    ＆LT;选择一个id =adjusterLanguages​​_0__languageIDNAME =adjusterLanguages​​ [0] .languageID＆GT;＆LT;期权价值=＆GT;  - 选择---
        ＆LT; /选项＆GT;
        ＆LT;期权价值=94c5be88-814e-4719-9784-587eb88aa975＆GT; Afrikanns＆LT; /选项＆GT;
        ＆LT;期权价值=37b7bf71-7f4e-47c2-8b81-652b0d63dbcb＆GT;阿尔巴尼亚＆LT; /选项＆GT;
        ＆LT;期权价值=c94d6d85-0ba2-47d7-932e-2a61feba37b3＆GT;阿拉伯语＆LT; /选项＆GT;
...截断简洁...
    ＆LT; /选择＆GT;
    ＆LT;跨度类=现场验证，有效的数据valmsg换=adjusterLanguages​​ [0] .languageID数据valmsg替换=真正的＆GT;＆LT; / SPAN＆GT;
＆LT; / DIV＆GT;
＆LT; D​​IV的风格=明确：左;＆GT;＆LT; / DIV＆GT;
＆LT; D​​IV CLASS =主编场行＆GT;
     ＆LT;选择一个id =adjusterLanguages​​_1__languageIDNAME =adjusterLanguages​​ [1] .languageID＆GT;
          ＆LT;期权价值=＆GT;  - 选择 - ＆LT; /选项＆GT;
          ＆LT;期权价值=94c5be88-814e-4719-9784-587eb88aa975＆GT; Afrikanns＆LT; /选项＆GT;
          ＆LT;期权价值=37b7bf71-7f4e-47c2-8b81-652b0d63dbcb＆GT;阿尔巴尼亚＆LT; /选项＆GT;
          ＆LT;期权价值=c94d6d85-0ba2-47d7-932e-2a61feba37b3＆GT;阿拉伯语＆LT; /选项＆GT;
...截断简洁...
     ＆LT; /选择＆GT;
     ＆LT;跨度类=现场验证，有效的数据valmsg换=adjusterLanguages​​ [1] .languageID数据valmsg替换=真正的＆GT;＆LT; / SPAN＆GT;
＆LT; / DIV＆GT;
 

解决方案

我找到了答案！感谢所有您的帮助。当我改变我的code到下面，它的工作原理。在code简单地指定选择的值：

  @ Html.DropDownListFor（
   模型=＆GT; Model.adjusterLanguages​​ [I] .languageID，
   新的SelectList（
       ViewBag.ForeignLanguages​​，值，文本，
       @ Model.adjusterLanguages​​ [I] .languageID））
 

I have read through this question ASP.NET MVC DropDownListFor not selecting value from model and answer but I don't know the solution to my problem.

This is my view:

@foreach (var adjusterLanguages in Model.adjusterLanguages)
{
    <div class="editor-field row">
        @Html.DropDownListFor(model => Model.adjusterLanguages[i].languageID,
                              (SelectList)ViewBag.ForeignLanguages) 
        @Html.ValidationMessageFor(model =>Model.adjusterLanguages[i].languageID)
    </div>

    <div style="clear: left;"></div>

    i++;
}

I can confirm that the model data is being populated (from my controller):

model.adjusterLanguages = adjLangs;

So, how can I make it select the items when the model gets sent to the view?

Edit:

The generated html is as follows:

<div class="editor-field row">
    <select id="adjusterLanguages_0__languageID" name="adjusterLanguages[0].languageID"><option value="">--Select--
        </option>
        <option value="94c5be88-814e-4719-9784-587eb88aa975">Afrikanns</option>
        <option value="37b7bf71-7f4e-47c2-8b81-652b0d63dbcb">Albanian</option>
        <option value="c94d6d85-0ba2-47d7-932e-2a61feba37b3">Arabic</option>
... truncated for brevity ...
    </select> 
    <span class="field-validation-valid" data-valmsg-for="adjusterLanguages[0].languageID" data-valmsg-replace="true"></span>
</div>
<div style="clear: left;"></div>
<div class="editor-field row">
     <select id="adjusterLanguages_1__languageID" name="adjusterLanguages[1].languageID">
          <option value="">--Select--</option>
          <option value="94c5be88-814e-4719-9784-587eb88aa975">Afrikanns</option>
          <option value="37b7bf71-7f4e-47c2-8b81-652b0d63dbcb">Albanian</option>
          <option value="c94d6d85-0ba2-47d7-932e-2a61feba37b3">Arabic</option>
... truncated for brevity ...
     </select> 
     <span class="field-validation-valid" data-valmsg-for="adjusterLanguages[1].languageID" data-valmsg-replace="true"></span>
</div>

解决方案

I found the answer! Thanks to all for your help. When I change my code to the following, it works. The code simply specifies the selected value:

@Html.DropDownListFor(
   model => Model.adjusterLanguages[i].languageID, 
   new SelectList(
       ViewBag.ForeignLanguages, "Value", "Text", 
       @Model.adjusterLanguages[i].languageID)) 

这篇关于MVC DropDownListFor不选择从模型值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！