DropdownlistFor引发错误 [英] DropdownlistFor throws an error

问题描述

我在下拉列表中使用硬编码的字符串值到视图，并从数据库中传递选定的值，其中0 =未决，1 =完成和3 =等待，下面是视图和控制器的代码:

I am using hardcoded string values for dropdownlist to the view , and passing the selected value from database , where 0 = pending , 1 = complete and 3 = awaiting, below is the code for view and controller:

 var paymentStatus = new[] { "Pending", "Complete", "AwaitingPayment" };
  ViewData["StatusID"] = new SelectList(paymentStatus, "Value", "Text", booking.StatusID);


   <tr><td>Status</td><td><%: Html.DropDownListFor(m => m.StatusID, ViewData["StatusID"] as SelectList)%></td></tr>

出现错误: 数据绑定:"System.String"不包含名称为值"的属性.

It comes up with the error : DataBinding: 'System.String' does not contain a property with the name 'Value'.

推荐答案

示例的问题是，您要将字符串数组传递到SelectList，然后告诉SelectList使用Value和Text属性(字符串没有).您可能应该为此创建一个类:

The problem with your example is that you are passing a string array into the SelectList and then telling the SelectList to use the Value and Text properties (which a string does not have). You should probably create a class for this:

public class Status {
    public int Id { get; set; }
    public string Text { get; set; }
}

var statusTypes = new List<Status> {
    new Status { Id = 1, Text = "Pending" },
    new Status { Id = 2, Text = "Complete" },
    new Status { Id = 3, Text = "AwaitingPayment" }
};

更好的是，为此数据创建一个存储库:

Better yet, create a repository for this data:

var statusTypes = statusRepository.GetStatusTypes();

将此传递到您的SelectList中:

Pass this into your SelectList:

SelectList statusList = new SelectList(statusTypes, "Id", "Text", booking.StatusID);

// return this in a ViewModel or use ViewData like you are now:
ViewData["Status"] = statusList;

return View(statusList);

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