我已经寻找解决方法有一段时间了，看到很多帖子向我展示如何做，但是当下拉列表改变时，我的SelectedIndexChanged事件仍无法触发。
DropDownList的AutoPostBack被设置为True，我也遵循了下面这篇帖子中的代码： 链接到帖子 以下是我的代码：
.ASPX
感谢您的帮助。 J.
DropDownList的AutoPostBack被设置为True，我也遵循了下面这篇帖子中的代码： 链接到帖子 以下是我的代码：
.ASPX
<asp:GridView ID="gvCases" DataKeyNames="UserId" runat="server" AutoGenerateColumns="False"
BorderWidth="0px" CssClass="gridList" GridLines="None">
<AlternatingRowStyle BackColor="#F7F7F7" />
<Columns>
<asp:BoundField DataField="id" HeaderText="Case Ref" />
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<asp:Label ID="clientName" runat="server" Text="Label"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="company" HeaderText="Company" />
<asp:TemplateField HeaderText="Order Date">
<ItemTemplate>
<asp:Label ID="dateTime" runat="server" Text="Label"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Case Owner">
<ItemTemplate>
<asp:DropDownList ID="iconUsers" runat="server" OnSelectedIndexChanged="iconUsers_SelectedIndexChanged">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:Button ID="btnDetails" runat="server" CausesValidation="False" Text="Details" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:Button ID="btnSchedule" runat="server" CausesValidation="False" Text="Schedule" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
.VB
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If (Request.IsAuthenticated = False) Then
Response.Redirect("~/admin/default.aspx")
End If
Dim keypadSQL As SqlConnection = New SqlConnection()
keypadSQL.ConnectionString = ConfigurationManager.ConnectionStrings("connKeypad").ConnectionString()
Dim cmdActive As SqlCommand = New SqlCommand()
cmdActive.Connection = keypadSQL
cmdActive.CommandText = "spCasesActive"
cmdActive.CommandType = CommandType.StoredProcedure
Dim daCases As SqlDataAdapter = New SqlDataAdapter
daCases.SelectCommand = cmdActive
Dim dsCases As DataSet = New DataSet()
daCases.Fill(dsCases, "CaseList")
Dim CaseTotal As Integer
CaseTotal = dsCases.Tables(0).Rows.Count
If CaseTotal = 1 Then
iCaseTotal.InnerHtml = CaseTotal & " Case"
Else
iCaseTotal.InnerHtml = CaseTotal & " Cases"
End If
gvCases.DataSource = dsCases
gvCases.DataBind()
cmdActive.Dispose()
If Page.IsPostBack Then
End If
End Sub
Protected Sub gvCases_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvCases.RowDataBound
If e.Row.RowType = DataControlRowType.Header Then
gvCases.Columns(5).ItemStyle.Width() = "60"
gvCases.Columns(6).ItemStyle.Width() = "70"
End If
If e.Row.RowType = DataControlRowType.DataRow Then
Dim rowView As DataRowView = CType(e.Row.DataItem, DataRowView)
Dim strClientName As String
Dim clientName As Label
strClientName = rowView("firstname") & " " & rowView("lastname")
clientName = CType(e.Row.FindControl("clientName"), Label)
clientName.Text = strClientName
Dim strDateTime As String
Dim dateTime As Label
strDateTime = rowView("CaseSent")
dateTime = CType(e.Row.FindControl("dateTime"), Label)
dateTime.Text = FormatDateTime(strDateTime, DateFormat.ShortDate) & "<br />" & FormatDateTime(strDateTime, DateFormat.ShortTime)
gvCases.Columns(3).ItemStyle.Font.Size = 8
gvCases.Columns(5).ControlStyle.CssClass = "btnEdit"
gvCases.Columns(6).ControlStyle.CssClass = "btnSchedule"
Dim intUserId As String
intUserId = Convert.ToString(gvCases.DataKeys(e.Row.RowIndex).Value)
Dim cmd As New SqlCommand("SELECT id, Firstname, Lastname, Firstname + ' ' + Lastname As FullName FROM [users_icon] ORDER BY Firstname, Lastname", New SqlConnection(ConfigurationManager.ConnectionStrings("connKeypad").ConnectionString()))
cmd.Connection.Open()
Dim ddlValues As SqlDataReader
ddlValues = cmd.ExecuteReader()
Dim iconUsers As DropDownList
iconUsers = CType(e.Row.FindControl("iconUsers"), DropDownList)
iconUsers.Style.Add("font-size", "11px")
iconUsers.DataSource = ddlValues
iconUsers.DataValueField = "id"
iconUsers.DataTextField = "FullName"
iconUsers.DataBind()
Dim ListItem1 = New ListItem("Select Case Owner", "0")
iconUsers.Items.Insert("0", ListItem1)
iconUsers.AutoPostBack = True
If IsDBNull(rowView("CaseOwner")) Then
iconUsers.SelectedValue = 0
Else
iconUsers.SelectedValue = rowView("CaseOwner")
End If
AddHandler iconUsers.SelectedIndexChanged, AddressOf iconUsers_SelectedIndexChanged
cmd.Connection.Close()
cmd.Connection.Dispose()
Dim btnDetails As Button = CType(e.Row.FindControl("btnDetails"), Button)
btnDetails.PostBackUrl = "~/admin/detail.aspx?uid=" & intUserId
Dim LabelAddress As Button = CType(e.Row.FindControl("btnSchedule"), Button)
LabelAddress.PostBackUrl = "~/admin/schedule.aspx?uid=" & intUserId
End If
End Sub
Protected Sub iconUsers_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)
Response.Write("Function Called")
End Sub
感谢您的帮助。 J.