MVC視圖有兩種形式，爲什麼都呈現相同的動作？

Question

@using (Html.BeginForm("Unassign", "Terminals_DataGroups")) 
{ 
    @Html.HiddenFor(m => m.DeviceId) 
    @Html.HiddenFor(m => m.DataGroupId) 
    <input type="submit" value="Remove group from device" @(string.IsNullOrEmpty(Model.DataGroupName) ? "disabled=\"disabled\"" : "") /> 
} 

@using (Html.BeginForm("Assign", "Terminals_DataGroups")) 
{ 
    @Html.HiddenFor(m => m.DeviceId) 

    <div class="editor-label"> 
     @Html.LabelFor(model => model.DataGroups) 
    </div> 
    <div class="editor-field"> 
     @Html.DropDownListFor(model => model.DataGroupsSelectedItem, new SelectList(Model.DataGroups, "Value", "Text")) 
     @Html.ValidationMessageFor(model => model.DataGroupsSelectedItem) 
    </div> 

    <input type="submit" value="Assign Data Group" /> 
} 

然而，HTML呈現爲：

<form action="/Terminals_DataGroups/Assign" method="post"> 
    <input data-val="true" 
     data-val-number="The field DeviceId must be a number." 
     data-val-required="The DeviceId field is required." 
     id="DeviceId" 
     name="DeviceId" 
     type="hidden" 
     value="15" /> 
    <input data-val="true" 
     data-val-number="The field DataGroupId must be a number." 
     id="DataGroupId" 
     name="DataGroupId" 
     type="hidden" 
     value="1" /> 
    <input type="submit" value="Remove group from device" /> 
</form> 

<form action="/Terminals_DataGroups/Assign" method="post"> 
    <input data-val="true" 
     data-val-number="The field DeviceId must be a number." 
     data-val-required="The DeviceId field is required." 
     id="DeviceId" 
     name="DeviceId" 
     type="hidden" 
     value="15" /> 
    <div class="editor-label"> 
     <label for="DataGroups">Data groups</label> 
    </div> 
    <div class="editor-field"> 
     <select data-val="true" 
      data-val-number="The field DataGroupsSelectedItem must be a number." 
      id="DataGroupsSelectedItem" 
      name="DataGroupsSelectedItem"> 
      <option value="2">DataGroup2</option> 
      <option value="3">DataGroup3</option> 
      <option value="5">New group</option> 
     </select> 
     <span class="field-validation-valid" 
      data-valmsg-for="DataGroupsSelectedItem" 
      data-valmsg-replace="true"></span> 
    </div> 
    <input type="submit" value="Assign Data Group" /> 
</form> 

Answer 1

必須加入ID標籤和值 索裏我的英語;）