我有一个带有1个DataGrid的Windows窗体，其中一个列中有一个Dropdownlist。
我还在此DataGrid之外有另一个dropDownlist。
这两个下拉列表都绑定到同一个数据集，并且都填充了相同的项目。
两个DropDowns都将其Autopostbacks设置为true。
问题仅适用于Datagrid之外的下拉列表SelectedIndexChange事件被触发：
（我在SO上看过多个类似的问题，但没有一个建议对我有用。所以我真的很感激你能不能在这里帮助我。
）
Protected Sub ABCD(ByVal sender As System.Object, ByVal e As System.EventArgs)
End Sub
对于两个下拉列表：AutoPostBack =“True”
这是Vb代码：
Imports System.Data.OleDb
Public Class WebForm1
Inherits System.Web.UI.Page
Protected WithEvents dg As New System.Web.UI.WebControls.DataGrid
Private cnDB As New OleDbConnection
Private ds As New DataSet
Private daDB As New OleDbDataAdapter
Protected allNames As New DataSet
Protected MyDataSet As DataSet
Protected WithEvents DropDownList1 As System.Web.UI.WebControls.DropDownList
Protected WithEvents DropDownList2 As System.Web.UI.WebControls.DropDownList
Protected WithEvents ddlName As New System.Web.UI.WebControls.DropDownList
#Region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
End Sub
'NOTE: The following placeholder declaration is required by the Web Form Designer.
'Do not delete or move it.
Private designerPlaceholderDeclaration As System.Object
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
InitializeComponent()
End Sub
#End Region
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
MyDataSet = NameBudget()
GridDataLoad()
End Sub
Protected Sub Grid_EditCommand(ByVal source As Object, ByVal e As DataGridCommandEventArgs)
dg.EditItemIndex = e.Item.ItemIndex
dg.DataSource = ds
dg.DataBind()
End Sub
Protected Sub Grid_CancelCommand(ByVal source As Object, ByVal e As DataGridCommandEventArgs)
dg.DataSource = ds.Tables(0).DefaultView
dg.EditItemIndex = -1
dg.DataSource = ds
dg.DataBind()
End Sub
Protected Sub Grid_UpdateCommand(ByVal source As Object, ByVal e As DataGridCommandEventArgs)
End Sub
Private Function GridDataLoad()
ddlName.DataSource = MyDataSet
Dim i As Object = MyDataSet.Tables(0)
ddlName.DataBind()
DropDownList1.DataSource = MyDataSet
DropDownList1.DataBind()
Dim strCon As String = _
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\AccessTestDataBases\TestDB.mdb; "
Dim cnDB As New OleDbConnection(strCon)
cnDB.Open()
daDB = New OleDbDataAdapter("Select * from [Persons]", cnDB)
daDB.Fill(ds, "tbl1")
Dim j As Object = ds.Tables(0)
dg.DataSource = ds
dg.DataBind()
cnDB.Close()
Dim ii As Object = ds.Tables(0)
End Function
Protected Function NameEditable(ByVal n As String) As Boolean
Return True
End Function
Protected Function NameBudget() As DataSet
Dim strCon As String = _
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\AccessTestDataBases\TestDB.mdb; "
Dim cnDB As New OleDbConnection(strCon)
cnDB.Open()
daDB = New OleDbDataAdapter("Select ID,Name from [Persons]", cnDB)
Dim ds As New DataSet
daDB.Fill(ds, "tbl1")
cnDB.Close()
Return ds
End Function
Sub SetDefaultListItem(ByVal sender As Object, ByVal e As System.EventArgs)
'*************************************************************************
'* Use this sub to set the Default List for DropDown Listboxes *
'*************************************************************************
Try
If Len(sender.DefaultValue) > 0 Then
If sender.Items.FindByValue(sender.DefaultValue).ToString.Length > 0 Then
sender.Items.FindByValue(sender.DefaultValue).Selected = True
End If
End If
Catch ex As System.Exception
'Throw New System.Exception(ex.ToString())
End Try
End Sub
Protected Sub ABCD(ByVal sender As System.Object, ByVal e As System.EventArgs)
End Sub
End Class
以下是datagrid和Dropdownlists的HTML：
<Columns>
<ASP:ButtonColumn Text="Delete" CommandName="Delete"></ASP:ButtonColumn>
<asp:EditCommandColumn ButtonType="LinkButton" UpdateText="Update" CancelText="Cancel"
EditText="Edit"></asp:EditCommandColumn>
<ASP:TemplateColumn HeaderText="Name" SortExpression="FY" HeaderStyle-HorizontalAlign="center" HeaderStyle-Wrap="True">
<ItemStyle Wrap="false" HorizontalAlign="left" />
<ItemTemplate>
<ASP:Label ID="Name" Text='<%# DataBinder.Eval(Container.DataItem, "Name") %>' runat="server"/>
</ItemTemplate>
<EditItemTemplate>
<ASP:DropDownList id="DropDownlist2" datasource="<%# MyDataSet %>" DataTextField= "Name" DataValueField="ID" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ABCD">
</ASP:DropDownList>
</EditItemTemplate>
</ASP:TemplateColumn>
</Columns>
<asp:DropDownList id="DropDownList1"
datasource="<%# MyDataSet %>" DataTextField= "Name"
DataValueField="ID" runat="server" AutoPostBack="True"
OnSelectedIndexChanged="ABCD">
</asp:DropDownList>