Linq 因 Range 变量 'Username' 隐藏变量而出错

Question

首先是代码:

Dim tCards = (From r In myDB.CAH_TableCards Join c In myDB.CAH_Cards On r.CardId Equals c.CardId Where r.GameId = oGame.GameId And r.Round = oGame.Round Select c).SingleOrDefault
Dim pCards = From r In myDB.CAH_PlayerCards Join c In myDB.CAH_Cards On r.CardID Equals c.CardId Where r.GameId = oGame.GameId And r.username = UserName Select c
Dim rcards As List(Of TableCard) = From z In myDB.CAH_RoundCards Join c In myDB.CAH_Cards On z.CardId Equals c.CardId Where z.GameId = oGame.GameId And z.Round = oGame.Round Select c.CardId, c.CardType, c.Text, c.Answers, c.SetId, c.Added, z.Username, z.Visible

现在上课:

Imports Microsoft.VisualBasic
Public Class TableCard
    Public CardId As Integer
    Public CardType As Integer
    Public Text As String
    Public Answers As Integer
    Public SetId As Integer
    Public Added As Date
    Public Visible As Boolean
    Public Username As String
End Class

最后这个问题:

官方错误是

BC30978: Range variable 'Username' hides a variable in an enclosing block or a range variable previously defined in the query expression.

在研究这个错误后，我想出了 zip、zilch、nada。现在，直到我将 z.username 添加到最后才出现错误。在此之前它运行良好。 Username 字段是该表中的有效字段。我在代码的其他部分使用了 CAH_RoundCards ，没有任何问题。我需要做什么才能让它发挥作用？

Answer 1

我发现了...在代码的早期，我有一个名为 UserName 的变量...所以我只是更改了它并且它起作用了。