Question

我创建了一个数据访问层对象来处理查询执行。问题在于，当我调用它时，它最终会在Item_DataBound两次运行，所以有些东西不在这里。提前谢谢。

Case "DataGrid"
    If Len(DataValueField) > 0 Then
        Dim oDS As New DataSet
        Dim oDV As New DataView
        oDV = DataTable.DefaultView
        oDV.Sort = DataValueField & " ASC"
        oDS.Tables.Add(oDV.ToTable)
        CType(WebControl, DataGrid).DataSource = oDS
        CType(WebControl, DataGrid).DataBind()
    Else
        CType(WebControl, DataGrid).DataSource = _DataSet
        CType(WebControl, DataGrid).DataBind()
    End If
    CType(WebControl, DataGrid).DataSource = _DataSet
    CType(WebControl, DataGrid).DataBind()

Answer 1

根据不完整的代码段，无论DataValueField的长度是多少，都有两个DataBinds ......

Case "DataGrid"
If Len(DataValueField) > 0 Then
    Dim oDS As New DataSet
    Dim oDV As New DataView
    oDV = DataTable.DefaultView
    oDV.Sort = DataValueField & " ASC"
    oDS.Tables.Add(oDV.ToTable)
    CType(WebControl, DataGrid).DataSource = oDS
    CType(WebControl, DataGrid).DataBind()   'FIRST IF DATAVALUEFIELD LEN>0
Else
    CType(WebControl, DataGrid).DataSource = _DataSet
    CType(WebControl, DataGrid).DataBind()   'FIRST IF DATAVALUEFIELD LEN=0
End If
CType(WebControl, DataGrid).DataSource = _DataSet
CType(WebControl, DataGrid).DataBind()    'SECOND DATABIND HAPPENS IN EITHER CASE

数据访问层引发DataBound两次

1 个答案: