验证在MVC 4下拉列表中不起作用 [英] Validation is not working in MVC 4 drop down list

问题描述

这是我的视图模型。

  //  供应商信息 
  public   string  VendorName {获得;  set ; } 
 [显示（名称=  供应商）] 
 [必填（ ErrorMessage =  请选择供应商）] 
  public  Guid VendorId { get ;  set ; } 
 
  //  供应商列表 
  public  IEnumerable< IpNetworkViewModel> GetVendor（Guid Cid）
 {
  var  SQry = 来自 l   db.Vendors 
 其中 l.CustomerId == Cid 
  orderby  l.VendorName 
 选择  new  {l.VendorId ，l.VendorName}; 
 
 List< IpNetworkViewModel> SList =  new 列表< IpNetworkViewModel>（）; 
 SList.Add（ new  IpNetworkViewModel {VendorId = Guid.Empty，VendorName =    - 选择供应商 - }）; 
 
  foreach （ var  p  in  SQry）
 {
 SList.Add（ new  IpNetworkViewModel {VendorId = p.VendorId，VendorName = p.VendorName}） ; 
} 
 返回 SList; 
 
} 
 

这是我的查看

 <   div     class   =  all-div >  
 @ Html.LabelFor（model => model.VendorId）
 <   / div  >  
 <  < span class =code-leadattribute> div     class   =  all-div >  
 <   div     class   =  drop_down  >  
 @ Html.DropDownListFor（model => model.VendorId，new SelectList（new ConsultantsHub.Areas.ChAdmin.ViewModel.IpNetworkViewModel（）。GetVendor（Model.CustomerId），VendorId，VendorName））
 @ Html.ValidationMessageFor（model => model .VendorId）
 <   / div  > ;  
 <   / div  >  

任何人，请帮助我如何为上面的下拉列表进行必要的字段验证。

解决方案

This is my "view model".

//Vendor  info
      public string VendorName { get; set; }
      [Display(Name = "Vendor")]
      [Required(ErrorMessage = "Please select a Vendor")]
      public Guid VendorId { get; set; }

      //Vendor list
      public IEnumerable<IpNetworkViewModel> GetVendor(Guid Cid)
      {
          var SQry = from l in db.Vendors
                     where l.CustomerId == Cid
                     orderby l.VendorName
                     select new { l.VendorId, l.VendorName };

          List<IpNetworkViewModel> SList = new List<IpNetworkViewModel>();
          SList.Add(new IpNetworkViewModel { VendorId = Guid.Empty, VendorName = "-Select Vendor-" });

          foreach (var p in SQry)
          {
              SList.Add(new IpNetworkViewModel { VendorId = p.VendorId, VendorName = p.VendorName });
          }
          return SList;

      }

This is my "View"

<div class="all-div">
           @Html.LabelFor(model => model.VendorId)
        </div>
         <div class="all-div">
          <div class="drop_down">
           @Html.DropDownListFor(model => model.VendorId, new SelectList(new ConsultantsHub.Areas.ChAdmin.ViewModel.IpNetworkViewModel().GetVendor(Model.CustomerId), "VendorId", "VendorName"))
           @Html.ValidationMessageFor(model => model.VendorId)
        </div>
        </div>

Any one, please help me how to do required field validation for above drop down list.

解决方案

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