asp.net - 数据绑定列表视图

Question

Dim  _tableBackLogs As System.Data.DataTable  



 Do While i - 2 > 0
        _tableBackLogs = Global.DataAccess.GetDataTable("SELECT SubjectID,SubjectName,Grade FROM SubjectPI WHERE RegNo='" & CInt(HttpContext.Current.Session("userName")) & "' AND Status='Fail' AND Semester='" & i - 2 & "'")
        i = i - 2
    Loop

lvBackSubjects.DataSource = _tableBackLogs
lvBackSubjects.DataBind()

这样做只绑定i提供给ListView.I want all the data.Suppose的最后一个值的数据i=5。所以我希望ListView有数据。i=3,1希望我不会让你们感到困惑。

Answer 1

看起来循环正在覆盖变量 _tableBackLogs。可能最好做这样的事情：

dim semesters as New System.Text.StringBuilder()

Do While i - 2 > 0
    semesters.Append("'" & i & "',")
    i = i - 2
Loop

' remove the last ,
semesters.Remove(semesters.Length -1,1)

_tableBackLogs = Global.DataAccess.GetDataTable("SELECT SubjectID,SubjectName,Grade FROM SubjectPI WHERE RegNo='" & CInt(HttpContext.Current.Session("userName")) & "' AND Status='Fail' AND Semester in (" & semesters.ToString() & ")"