在MVC4视图中转换日期时间会导致错误

Question

我在项目中有一个由EF6创建的内容实体模型 。

 public partial class Content
{
    public Content()
    {
        this.Comments = new HashSet<Comment>();
    }

    public int Id { get; set; }
    public string Subject { get; set; }
    [DataType(DataType.MultilineText)]
    public string Brief { get; set; }
    [UIHint("tinymce_full"), AllowHtml]
    public string MainText { get; set; }
    [DataType(DataType.DateTime)]
    public System.DateTime DateOfPublish { get; set; }
    [DataType(DataType.ImageUrl)]
    public string SmallImageUrl { get; set; }
    [DataType(DataType.ImageUrl)]
    public string BigImageUrl { get; set; }
    public string KeyWords { get; set; }
    [DataType(DataType.DateTime)]
    public System.DateTime DateOfExpire { get; set; }
    public string AutherUserName { get; set; }
    public long VisitVCount { get; set; }
    public string Visible { get; set; }
    public int ContentGroupId { get; set; }
    public long LikeCount { get; set; }

    public virtual ContentGroup ContentGroup { get; set; }
    public virtual ICollection<Comment> Comments { get; set; }
}

如您所见，我有一列DateOfPublish ，类型为Datetime 。

我想使用此功能将日期DateOfPublish转换为波斯日期：

public string ConvertToPersianToShow(DateTime? datetime)
        {
            string date;
            DateTime dt;

            if (!datetime.HasValue) return "";
            dt = datetime.Value;          
            string year = Convert.ToString(persian_date.GetYear(dt));
            string month = Convert.ToString(persian_date.GetMonth(dt));
            string day = Convert.ToString(persian_date.GetDayOfMonth(dt));
            if (month.Length == 1)
            {
                month = "0" + Convert.ToString(persian_date.GetMonth(dt));
            }
            if (day.Length == 1)
            {
                day = "0" + Convert.ToString(persian_date.GetDayOfMonth(dt));
            }
 Convert.ToString(persian_date.GetMonth(dt)) + "/" +

            date = year + "/" + month + "/" + day;
            return date;
        }

所以我在View（ content view ）中调用了这个函数，所以我试图用这个函数在波斯语中显示日期，所以我将英语日期传递给了我的函数，如下所示：

@{
    ViewBag.Title = "Index";
    DateConverter objconverter = new DateConverter();
}
         <td>
            @Html.DisplayFor(objconverter.ConvertToPersianToShow(modelItem => item.DateOfPublish ))
    </td>

但是我得到了这个错误：

Argument type "lambda expression" is not assignable to parameter type 'system.nullable<system.datatime>'

最好的祝福

Answer 1

  @Html.DisplayFor(modelItem => objconverter.ConvertToPersianToShow(item.DateOfPublish ))

Answer 2

我想你要：

@Html.DisplayFor(item => objconverter.ConvertToPersianToShow(item.DateOfPublish ))