C# 无法从“int”转换为“System.Predicate”

我遇到以下错误：无法从“int”转换为“System.Predicate ServerHomeship.Models.Organization”

在OrgList.AddOrganization.FindUTO.OrganizationID行的一部分； 属性UTO.organizationId是一个int，但它仍然表示有问题。有人能告诉我这里出了什么问题吗

代码在这里：

public virtual List<Organisation> Organisation
{
    get
    {
        List<UsersToOrganisations> UserToOrg = UsersToOrganisations.FindListOfOrganisations(UserId);
        List<Organisation> OrgList = new List<Models.Organisation>();

        if (UserToOrg.Count > 0)
            foreach (UsersToOrganisations UTO in UserToOrg)
                OrgList.Add(Organisation.Find(UTO.OrganisationId));
        else
            OrgList.Add(new Organisation("No organisation was found.", 0));


        return OrgList;
    }
} 

这是UserToOrganization类

class UsersToOrganisations
{
    public int Id { get; set; }
    public int UserId { get; set; }
    public int OrganisationId { get; set; }
    public bool MainOrganisation { get; set; }

    /// <summary>
    /// Constructor for entity framework
    /// </summary>
    public UsersToOrganisations() { }

    /// <summary>
    /// Constructor for creation
    /// </summary>
    /// <param name="UserId"></param>
    /// <param name="OrganisationId"></param>
    public UsersToOrganisations(int UserId, int OrganisationId, bool MainOrganisation)
    {
        this.UserId = UserId;
        this.OrganisationId = OrganisationId;
        this.MainOrganisation = MainOrganisation;
    }

    public class UsersToOrganisationsContext : DbContext
    {
        public DbSet<UsersToOrganisations> UserToOrganisation { get; set; }
    }

    /// <summary>
    /// Get the list of organisations of a single user
    /// </summary>
    /// <param name="UserId"></param>
    /// <returns></returns>
    public static List<UsersToOrganisations> FindListOfOrganisations(int UserId)
    {
        using (var context = new UsersToOrganisationsContext())
        {
            var organisation = (from uto in context.UserToOrganisation
                               where uto.UserId == UserId
                                select uto);
            return organisation.ToList();
        }
    }

    /// <summary>
    /// Get the main organisation of a user
    /// </summary>
    /// <param name="UserId"></param>
    /// <returns></returns>
    public static UsersToOrganisations FindMainOrganisation(int UserId)
    {
        using (var context = new UsersToOrganisationsContext())
        {
            var UserToOrganisation = context.UserToOrganisation
                  .Where(uto => uto.UserId == UserId && uto.MainOrganisation == true)
                  .SingleOrDefault();

            return UserToOrganisation; 
        }
    }

}

Find将谓词作为参数。您提供的只是一个int

请尝试以下操作：

OrgList.Add(Organisation.Find(u => u.OrganisationId == UTO.OrganisationId));

---

问题在于中的lambda表达式 OrgList.addorganization.FindUTO.organizationId

你想做点什么 OrgList.AddOrganization.Finditem=>item.OrganizationId==UTO.OrganizationId

---

有关详细信息：

我发现此问题是因为我使用的是List.Find而不是List.Contains。切换到using List.Contains将只处理int，因此不需要谓词。

您是否缺少结束符？是的，很抱歉，我遗漏了。但是VisualStudio给出的信息仍然是一样的。