DropDownList SelectedIndexChanged在Gridview中没有触发！ [英] DropDownList SelectedIndexChanged within Gridview not firing!
问题描述
我一直在寻找一个解决方案一段时间，看到许多帖子告诉我如何做，但是当DropDownList更改时，我无法使我的SelectedIndexChanged事件触发。
I have been looking for a solution to this for a while though and seen many posts that show me how to do it but yet I cannot get my SelectedIndexChanged event to fire when the DropDownList is changed.
DropDownList AutoPostBack设置为True，我还在以下帖子中跟随了代码：
链接到帖子
The DropDownList AutoPostBack is set to True, i've followed code in the below post also: Link to post
这是我的代码：
.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
Thanks for any help. J.
推荐答案
有一些类似的问题（见事件处理程序不使用AddHandler进行触发
和将事件分配给Repeater控件中的自定义控件），但是您的特定情况看起来像你正在添加处理程序两次;一次在标记中，一次在数据绑定。
There are some similar questions (see Event handler not firing using AddHandler and Assign an event to a custom control inside a Repeater control), but your particular case looks like you're adding the handler twice; once in the markup, and once on databound.
我会删除RowDataBound事件中的一个（因为它没有做任何事情，因为处理程序将丢失，当你做回帖，事件发生后会添加处理程序）。此外，请确保您的AutoPostBack为@Bala提及。
I'd remove the one in the RowDataBound event (as it's not doing anything, because the handler will be lost when you do post back, and the handler is added after the event would actually fire). Also, make sure you AutoPostBack as @Bala mentions.
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