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() 

这样做绑定只提供给ListView。我的i最后一个值的数据要全部data.Suppose i=5。所以我想ListView有i=3,1的数据。希望我不会混淆你们。

Answer 1

看起来循环覆盖变量_tableBackLogs。可能更好的做这样的事情：

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() & ")"