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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：范围变量“用户名”隐藏封闭块中的变量或先前在查询表达式中定义的范围变量。

在研究了错误后，我想出了 zip、zilch、nada。现在错误直到我添加z.username到最后才发生。在此之前它工作得很好。该Username字段是该表中的有效字段。我已经CAH_RoundCards在代码的其他部分使用没有问题。我需要做什么才能使其正常工作？

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1 回答 1

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我想通了......在代码的早期，我有一个名为 UserName 的变量......所以我只是改变了它并且它起作用了。

于 2013-10-03T16:43:07.360 回答