标题：请教在窗口中如何用In关键字

im dt2 As DataTable
        Dim dr2 As DataRow
        cmd.CommandText = "select gID from {gradeInfo} where gradeName = '" & e.Form.Controls("cbcgInfo").value.trim() & "'"
        dt = cmd.ExecuteReader()
        dr = dt.DataRows(0)
        cmd.CommandText = "select cID from {classInfo} where gID = " & dr("gID")
        dt2 = cmd.ExecuteReader()
        'dr2 = dt2.DataCols
        MessageBox.Show(dt2.DataCols("cID").Tostring)
        Tables("档案信息_studentInfo").Filter = " 班级 in  条件

怎么用IN关键字，如何根据查询的cID的值作条件

没有表测试，只能大概给个代码，请自行调整，如果班级是整数型，记得不用单引号。

Dim dt2 As DataTable
Dim dr2 As DataRow
Dim bjs As String
cmd.CommandText = "select gID from {gradeInfo} where gradeName = '" & e.Form.Controls("cbcgInfo").value.trim() & "'"
dt = cmd.ExecuteReader()
dr = dt.DataRows(0)
cmd.CommandText = "select cID from {classInfo} where gID = " & dr("gID")
dt2 = cmd.ExecuteReader()
For Each  dr As DataRow In dt2.DataRows
  bjs = bjs & "'" & dr("班级") & "',"
Next
bjs = bjs.Trim(","c)
Tables("档案信息_studentInfo").Filter = " 班级 in (" & bjs & ")"

谢谢！老大

我会调整了