如何从 C# 中的另一个列表中删除列表

Question

Here I have two list var userListFromFriendTable = mainService.GetUserFromFriend(ChattingUserName); and var getAllUserFromMessageUserTable = mainService.GetalluserfromMessageUser(); whose implementation are given below.

Now what is want is to remove all the Friend table FriendRequestReceiverName column data of userListFromFriendTable list from MessageUser table MessageUserName column of getAllUserFromMessageUserTable list.

Any help will be grate

    public List<Friend> GetUserFromFriend(string chattingUserName)
    {
        var checkUser = uow.Repository<Friend>().FindBy(x => x.FriendRequestSenderName.ToLower() == chattingUserName.ToLower()).ToList();
        return checkUser;
    }
    public List<MessageUser> GetalluserfromMessageUser()
    {
        var checkUser = uow.Repository<MessageUser>().GetAll().ToList();
        return checkUser;
    }

public class Friend
{
    public int FriendId { get; set; }
    public string FriendRequestSenderName { get; set; }
    public string FriendRequestReceiverName { get; set; }
    public int IsConfirmed { get; set; }
}
public class MessageUser
{
    public int Id { get; set; }
    public string MessageUserName { get; set; }
    public int IsFriend { get; set; }
}

Answer 1

try this:

var names=userListFromFriendTable.Select(i=> i.FriendRequestReceiverName) 
  .OfType<string>()
 .ToArray();

getAllUserFromMessageUserTable.RemoveAll(r => names.Contains( r.MessageUserName );