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我有一个网站，我想删除所有超过 15 天的广告。我不想从数据库中删除帖子，而只是将它们标记为“已删除 = true”。我试图在遍历广告列表时更新值，但没有成功。这是我的代码：

    [Authorize]
    [ValidateAntiForgeryToken]
    [HttpPost]
    public ActionResult RemoveOldAdsConfirmed()
    {
        DateTime removeDate = DateTime.Now.AddDays(-15);
        var removeAds = db.Ads.Where(a => a.Date <= removeDate && a.Deleted != true).OrderByDescending(a => a.Date);

        foreach (var items in removeAds)
        {
            // remove the images related to that specific ad
            foreach (var item in items.Images.ToList())
            {
                // remove image from disk
                System.IO.File.Delete(Server.MapPath("~/Content/img/UserUploads/") + item.ImageUrl);
                System.IO.File.Delete(Server.MapPath("~/Content/img/UserUploads/") + "medium_" + item.ImageUrl);
                System.IO.File.Delete(Server.MapPath("~/Content/img/UserUploads/") + "small_" + item.ImageUrl);

                // remove image from db
                Image deleteImage = db.Images.Find(item.ImageId);
                db.Images.Remove(deleteImage);
                db.SaveChanges();
            }

            // mark the ad as "Deleted"
            items.Deleted = true;

            // update the db
            db.Entry(items).State = EntityState.Modified;
            db.SaveChanges();
        }
        // Redirect to view that lists ads that should be removed
        return RedirectToAction("RemoveOldAds");
    }

这是我的模型：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;
using System.Web.Mvc;

namespace AlltForMusik.Models
{
public class Ad
{
    public virtual int AdId { get; set; }

    public virtual int CategoryId { get; set; }

    [Required(ErrorMessage = "Obligatoriskt fält")]
    [StringLength(70, ErrorMessage = "Max 70 tecken")]
    [Display(Name="Rubrik")]
    public virtual string Headline { get; set; }

    [Required(ErrorMessage = "Obligatoriskt fält")]
    [Display(Name = "Beskrivning")]
    [DataType(DataType.MultilineText)]
    public virtual string Text { get; set; }

    [ScaffoldColumn(false)]
    public virtual DateTime Date { get; set; }

    [Required(ErrorMessage = "Obligatoriskt fält")]
    [Display(Name = "Pris")]
    [Range(0, 999999999)]
    public virtual int Price { get; set; }

    [Display(Name = "Kan skickas")]
    public virtual int KanSkickas { get; set; }

    [Display(Name = "BVSA")]
    public virtual int BVSA { get; set; }

    [Required(ErrorMessage = "Obligatoriskt fält")]
    [StringLength(40, ErrorMessage = "Max 40 tecken")]
    [Display(Name = "Ditt namn")]
    public virtual string Name { get; set; }

    [StringLength(15, ErrorMessage = "Max 15 tecken")]
    [Display(Name = "Telefon")]
    public virtual string Phone { get; set; }

    [Required(ErrorMessage = "Obligatoriskt fält")]
    [StringLength(100, ErrorMessage = "Max 100 tecken")]
    [DataType(DataType.EmailAddress)]
    [RegularExpression(@"^([\w\!\#$\%\&\'\*\+\-\/\=\?\^\`{\|\}\~]+\.)*[\w\!\#$\%\&\'\*\+\-\/\=\?\^\`{\|\}\~]+@((((([a-zA-Z0-9]{1}[a-zA-Z0-9\-]{0,62}[a-zA-Z0-9]{1})|[a-zA-Z])\.)+[a-zA-Z]{2,6})|(\d{1,3}\.){3}\d{1,3}(\:\d{1,5})?)$",
                                    ErrorMessage="Inte en giltig e-postadress")]
    [Display(Name = "E-post")]
    public virtual string Email { get; set; }

    [Required(ErrorMessage = "Obligatoriskt fält")]
    [Display(Name = "Län")]
    public virtual int CountyId { get; set; }

    [Required(ErrorMessage = "Obligatoriskt fält")]
    [Display(Name = "Stad")]
    public virtual int CityId { get; set; }

    [Required(ErrorMessage = "Obligatoriskt fält")]
    public virtual int Type { get; set; }

    public string Password { get; set; }

    public bool Deleted { get; set; }

    [Display(Name = "Kategori")]
    public virtual Category Category { get; set; }

    public virtual ICollection<Image> Images { get; set; }


}
}

我收到此错误消息：

异常详情：

System.Data.Entity.Validation.DbEntityValidationException：
一个或多个实体的验证失败。有关更多详细信息，请参阅“EntityValidationErrors”属性。

问题是什么？

最好的问候米凯尔

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