在lambda作为参数新

Question

我是新来的，有人可以告诉我这是如何工作，以及在“mycode”为了调用存储库？

public class MemberService : ServiceBase<IMemberModel>, IMemberService 
{   
    public MemberViewModel GetSingle(Expression<Func<MemberViewModel, bool>> whereCondition) 
    { 
     mycode  
    } 
} 

public abstract class RepositoryBase<T> : IRepository<T> 
{ 
    public T GetSingle(Expression<Func<T, bool>> whereCondition) 
    { 
     return ObjectSet.Where(whereCondition).FirstOrDefault(); 
    } 
} 

谢谢！

Answer 1

你需要的可能是一个基于成员的lambda，而不是MemberViewModel。你的方法可能应该是这样的：

public MemberViewModel GetSingle(Expression<Func<Member,bool>> whereCondition) 
{ 
    var member = this.MemberRepository.GetSingle(whereCondition); 
    if (member != null) 
    { 
     return new MemberViewModel(member); 
     // or however you map from member to its view model 
    } 
    return null; 
}