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我想讓我的頭繞着LINQ問題。最終目標是使用從LINQ to SQL(視圖)獲取的數據加載樹視圖。問題是當我嘗試訪問獲取的數據時,它一直拋出「運行時不支持的查詢運算符」。所涉及的代碼是不超過:通過LINQ向樹添加節點在運行時創建「查詢運算符不受支持」
Dim tasklistdata As New lqDataContext
Dim UserID As Integer
UserID = (From vwUser In tasklistdata.Operators _
Where vwUser.UserName Is Login.txtUsername.Text _
Select vwUser.OperatorID).Single
Dim lqHospitalList = From vwHospitalList In tasklistdata.SPM_Accounts _
Where vwHospitalList.OperatorID = UserID _
Order By vwHospitalList.CustomerName, vwHospitalList.Class _
Select vwHospitalList.CustomerName, vwHospitalList.Class, vwHospitalList.ClassCount, vwHospitalList.Charges
tvHospitalSelect.Nodes.Add(lqHospitalList(0).CustomerName)
如果我修改代碼,lqHospitalList.First.CustomerName它能正常工作,但是將其更改爲陣列位置是問題出現。請指點我的邏輯缺陷。