无法获取IEnumerable视图模型集合，当前枚举器始终为null

Question

public class CityDto : IEnumerable<CityDto>
{
    public IEnumerator<CityDto> AllCities { get; set; }

    private List<CityDto> _CityDto;

    public IEnumerator<CityDto> GetEnumerator()
    {
        return _CityDto.GetEnumerator();
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        return _CityDto.GetEnumerator();
    }

    #region Constructors

    /// <summary>
    /// Initializes a new instance of the CityMasterdto class.
    /// </summary>
    public CityDto()
    {
    }

    /// <summary>
    /// Initializes a new instance of the CityMasterdto class.
    /// </summary>
    public CityDto(string city_name, long state_id, bool active)
    {
        this.City_name = city_name;
        this.State_id = state_id;
        this.Active = active;
    }

    #endregion

    #region Properties
    /// <summary>
    /// Gets or sets the state name value.
    /// </summary>
    public string State_name { get; set; }

    /// <summary>
    /// Gets or sets the City_id value.
    /// </summary>
    public long City_id { get; set; }

    /// <summary>
    /// Gets or sets the City_name value.
    /// </summary>
    [Display(Name="City Name")]
    [Required]
    public string City_name { get; set; }

    /// <summary>
    /// Gets or sets the State_id value.
    /// </summary>
    public long State_id { get; set; }
        public bool Active { get; set; }

    #endregion
}

这是我的控制器代码：

public ActionResult index()
{
     return View(GetCities(obj.Details()).AsEnumerable());
}

private IEnumerable<CityDto> GetCities(DataSet ds)
{
        foreach (DataRow row in ds.Tables[0].Rows)
        {
            yield return new CityDto
            {
                City_id = Convert.ToInt32(row["city_id"]),
                City_name = Convert.ToString(row["city_name"]),
                State_name = Convert.ToString(row["state_name"]),
                State_id = Convert.ToInt32(row["state_id"])
            };
        }
}

没有任何构建错误，但是当我运行代码时，我收到错误：

  

传递到字典中的模型项的类型为＆＃39; MvcApplication.Areas.Admin.Controllers.CityController + d _1＆＃39;，但此字典需要类型为＆＃39; MvcApplication.Areas.Admin的模型项.Models.CityDto＆＃39;

但我不明白这意味着什么......

System.Collections.Generic.IEnumerator<MvcApplication.Areas.Admin.Models.CityDto>.Current == null   

和

System.Collections.IEnumerator.Current == null  

也

ds == null

但结果视图显示了预期的数据

Answer 1

我也必须在视图中导入可数模型 升IEnumerable<MvcApplication.Areas.Admin.Models.CityDto>

不喜欢<MvcApplication.Areas.Admin.Models.CityDto>

我也在控制器索引中使用了这个httpget acton

  var model = obj.Details().Tables[0].AsEnumerable().Select(t => new CityDto {City_id=t.Field<long>("city_id"),
        State_id=t.Field<long>("state_id"),
        State_name=t.Field<string>("state_name"),
        City_name=t.Field<string>("city_name")
        });
        //var model = GetCities(obj.Details()).AsEnumerable().Select(t => t);
        return View(model);