如何在这些对象上使用下拉列表？

Question

我试图引用一个看起来像这个

的对象的下拉列表

public virtual List<Administrator> AuthorizedAdministrators { get; set; }
public int SelectedAuthorizedAdministrators { get; set; }

我这样引用：

@Html.DropDownListFor(model => model.SelectedAuthorizedAdministrators, new 
SelectList(Model.AuthorizedAdministrators.Select(x => new { Value = x.Id, Text = x.Username }),
 "Value", "Text"), Model.SelectedAuthorizedAdministrators)

我得到的错误是

 c:\STI\Portals\STI.Network.Web\Views\FinancialInstitutions\Create.cshtml(102): error CS0012: 
The type 'System.Collections.Generic.List`1<T0>' is defined in an assembly that is not 
referenced. You must add a reference to assembly 'System.Collections, 
Version=4.0.0.0,    Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.

如何解决此错误？我在我看来是否正确引用了这个模型？

Answer 1

请尝试如下，我认为它可以帮到你。

请将下面的下拉代码更改为简单

@Html.DropDownListFor(m => m.SelectedAuthorizedAdministrators, new SelectList(Model.AuthorizedAdministrators, "Id", "Username "))