c# - 如何在 ASP.NET MVC3 中创建下拉列表？

Question

我正在尝试根据链接到模型的允许值列表在 ASP.NET MVC3 View 中创建下拉列表。

到目前为止，在我的模型中，我有:

namespace NS 
{
    public class Model
    {
        public Model() 
        {
            Status = new List<SelectListItem>();
            Status.Add(new SelectListItem { Text = "New", Value = "New" });
            Status.Add(new SelectListItem { Text = "PaymentPending", Value = "PaymentPending" });
            Status.Add(new SelectListItem { Text = "PaymentProcessed", Value = "PaymentProcessed" });
            Status.Add(new SelectListItem { Text = "Dispatched", Value = "Dispatched" });
            Status.Add(new SelectListItem { Text = "Complete", Value = "Complete" });
            Status.Add(new SelectListItem { Text = "Cancelled", Value = "Cancelled" });
        }

        public List<SelectListItem> Status { get; set; }
    } // class Model
} // NS

(显然是去掉了不必要的东西)

然后在我看来我有:

@model NS.Model
@Html.DropDownListFor(Model.Status)

正如在 SO 上查看答案所暗示的那样。但是我得到一个错误:

Compiler Error Message: CS1501: No overload for method 'DropDownListFor' takes 1 arguments

非常感谢任何提示。

Answer 1

错误信息是不言自明的，DropDownListFor helper接受两个参数。

修改您的模型使其具有包含所选值的属性

public class Model
{
public Model() {
  Status = new List<SelectListItem>();
  Status.Add(new SelectListItem { Text = "New", Value = "New" });
  Status.Add(new SelectListItem { Text = "PaymentPending", Value = "PaymentPending" });
  Status.Add(new SelectListItem { Text = "PaymentProcessed", Value = "PaymentProcessed" });
  Status.Add(new SelectListItem { Text = "Dispatched", Value = "Dispatched" });
  Status.Add(new SelectListItem { Text = "Complete", Value = "Complete" });
  Status.Add(new SelectListItem { Text = "Cancelled", Value = "Cancelled" });
}
public List<SelectListItem> Status { get; set; }
public string SelectedVal{get;set;}
} 

然后在 View 中

@NS.Model
@Html.DropDownListFor(x=> x.SelectedVal, x.Status)