将 C# Linq 查询转换为 VB.Net Linq

我有一个项目，我在 if 条件中使用 Linq 查询来检查条件是真还是假，并且它在我的 C# 项目中工作正常。现在我有另一个项目，我想使用相同的东西，但问题是这个项目 vb.net，我在转换 Linq 查询时遇到问题。我在 c# 中的 linq 查询是这样的：

#region Data Members
        static List<UserDetail> ConnectedUsers = new List<UserDetail>();
        static List<MessageDetail> CurrentMessage = new List<MessageDetail>();
        #endregion
        #region Methods
        public void Connect(string userName)
        {
            var id = Context.ConnectionId;

            if (ConnectedUsers.Count(x => x.ConnectionId == id) == 0)
            {
                ConnectedUsers.Add(new UserDetail { ConnectionId = id, UserName = userName });
                // send to caller
                Clients.Caller.onConnected(id, userName, ConnectedUsers, CurrentMessage);
                // send to all except caller client
                Clients.AllExcept(id).onNewUserConnected(id, userName);
            }
        }
        }

它的 vb.net 等价物是这样的：

#Region "Data Members"
        Shared ConnectedUsers As New List(Of UserDetail)()
        Shared CurrentMessage As New List(Of MessageDetail)()
#End Region
#Region "Methods"
Public Sub Connect(userName As String)
            Dim id = Context.ConnectionId
            If ConnectedUsers.Count(Function(x) x.ConnectionId = id) = 0 Then

                ConnectedUsers.Add(New UserDetail() With { _
                    Key .ConnectionId = id, _
                    Key .UserName = userName _
                })
                ' send to caller
                Clients.Caller.onConnected(id, userName, ConnectedUsers, CurrentMessage)
                ' send to all except caller client
                Clients.AllExcept(id).onNewUserConnected(id, userName)
            End If
        End Sub

错误屏幕截图是这样的