不实现IEnumerable

时间:2013-03-08 14:53:28

标签: c# entity-framework

这是我的留言类:

public class SMessage
{

    public int AccountId { get; set; }

    public int MessageId { get; set; }

    public string str{ get; set; }
    public string Subject { get; set; }
    public int sendByAccountId { get; set; }
    [ForeignKey("sendByAccountId")]
    public virtual AccountModels account { get; set; }

}

这是我的dto课程:

public class MessageInformation
{
    public string Subject { get; set; }
    public string str { get; set; }    
}

这是我在存储库中的方法:

public List<MessageInformation> GetAllMessagesForUser(int accountId)
{
    MessageInformation messages
    using (SishanContext Context = new SishanContext())
    {
         messages = (from m in Context.SMessages.ToList()
                    where m.AccountId == accountId
                    select new MessageInformation
                    {
                       m.Subject,
                       m.str
                    }).ToList();
    }
    return messages;
}

但是,我有一个错误:

无法使用集合初始化程序初始化类型'sishan.Models.MessageInformation',因为它没有实现'System.Collections.IEnumerable'

1 个答案:

答案 0 :(得分:2)

您应该在初始化程序中命名属性,如下所示:

...
select new MessageInformation {
    Subject = m.Subject,
    str = m.str
}

或者,您可以提供一个双参数构造函数,并将其命名为:

public class MessageInformation {
    public string Subject { get; set; }
    public string str { get; set; }
    public MessageInformation(string subj, string str) {
        Subject = subj;
        this.str = str;
    }
}
...
select new MessageInformation(m.Subject, m.str)