将 C# Linq 查询转换为 VB.Net Linq

Question

我有一个项目，我在 if 条件下使用 Linq 查询来检查条件是真还是假，它在我的 C# 项目中工作正常。现在我有另一个项目，我想在其中使用相同的东西，但问题是这个项目在 vb.net 中，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

Error screen shot is like this

Answer 1

我得到了你需要做这样的事情的解决方案：

如果ConnectedUsers.AsEnumerable.Count(函数(x) x.ConnectionId = id) = 0 那么

将 C# Linq 查询转换为 VB.Net Linq

Convert C# Linq query to VB.Net Linq

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