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我是linq的新手。我正在嘗試編寫一個linq查詢,它將在數據庫中的3個字段上進行搜索。但是,如果任何字段爲空或不包含任何內容,那麼它將不會在查詢中包含該字段。linq中的多列搜索
搜索對象
Public Class Search
Public Property firstName As String
Public Property surname As String
Public Property address As String
End Class
表
CREATE TABLE [dbo].[user] (
[id] [int] IDENTITY(1,1) NOT NULL,
[firstName] [nvarchar](50) NULL,
[surname] [nvarchar](50) NULL,
[fullAddress] [nvarchar](1050) NULL
我的嘗試,但這不會得到任何數據傳回
(From it In db.user
Where (
searchItems.firstName IsNot Nothing
AndAlso it.firstName.Contains(searchItems.firstName))
AndAlso (searchItems.surname IsNot Nothing
AndAlso it.surname.Contains(searchItems.surname))
AndAlso (searchItems.address IsNot Nothing
AndAlso it.fullAddress.Contains(searchItems.address))
Select it).
ToList
此外,我需要這個限制爲250條記錄
在此先感謝 保羅
_「如何限制這250個記錄」_,使用「帶250」。你確定你不想在'Where'的外部條件下使用'OrElse'而不是'AndAlso'嗎(括號裏有提示)? – 2013-03-20 11:18:33