MVC DropDownList对于不从模型中选择值 [英] MVC DropDownListFor not selecting value from model

问题描述

我已经阅读了这个问题 ASP.NET MVC DropDownListFor没有从模型中选择价值并回答，但我不知道我的问题的解决方案.

这是我的观点:

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

<div style="clear: left;"></div>我++;}

我可以确认正在填充模型数据(来自我的控制器):

model.adjusterLanguages = adjLangs;

那么，当模型被发送到视图时，我怎样才能让它选择项目?

生成的html如下:

<select id="adjusterLanguages_0__languageID" name="adjusterLanguages[0].languageID"><option value="">--选择--</选项><option value="94c5be88-814e-4719-9784-587eb88aa975">南非语</option><option value="37b7bf71-7f4e-47c2-8b81-652b0d63dbcb">阿尔巴尼亚语</option><option value="c94d6d85-0ba2-47d7-932e-2a61feba37b3">阿拉伯语</option><!-- ... 为简洁起见被截断 ... --></选择><span class="field-validation-valid" data-valmsg-for="adjusterLanguages[0].languageID" data-valmsg-replace="true"></span>
<div style="clear: left;"></div><div class="editor-field row"><select id="adjusterLanguages_1__languageID" name="adjusterLanguages[1].languageID"><option value="">--选择--</option><option value="94c5be88-814e-4719-9784-587eb88aa975">南非语</option><option value="37b7bf71-7f4e-47c2-8b81-652b0d63dbcb">阿尔巴尼亚语</option><option value="c94d6d85-0ba2-47d7-932e-2a61feba37b3">阿拉伯语</option><!-- ... 为简洁起见被截断 ... --></选择><span class="field-validation-valid" data-valmsg-for="adjusterLanguages[1].languageID" data-valmsg-replace="true"></span>

解决方案

我找到了答案！感谢大家的帮助.当我将代码更改为以下内容时，它可以工作.代码只是指定了选定的值:

@Html.DropDownListFor(模型 =>模型.adjusterLanguages[i].languageID,新的选择列表(ViewBag.ForeignLanguages, "Value", "Text",@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?

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)) 

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