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EF 异常

{"Invalid column name 'Discriminator'.\r\nInvalid column name 'Discriminator'."

{SELECT     [Extent1].[Discriminator] AS [Discriminator],     [Extent1].[ID] AS [ID],     [Extent1].[SubID] AS [SubID],     [Extent1].[OtherID] AS [OtherID],     [Extent1].[OtherType] AS [OtherType],     [Extent1].[AddTime] AS [AddTime],     [Extent1].[Title] AS [Title],     [Extent1].[Summary] AS [Summary],     [Extent1].[Picture] AS [Picture],     [Extent1].[ViewCount] AS [ViewCount],     [Extent1].[AddTime_Other] AS [AddTime_Other],     [Extent1].[LinkUrl] AS [LinkUrl]    FROM [dbo].[Subject_Other] AS [Extent1]    WHERE ([Extent1].[Discriminator] IN (N'Subject_Other_Show',N'Subject_Other')) AND ([Extent1].[SubID] = @p__linq__0)}

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