Question

我对网格视图中的下拉列表有问题，它不会触发已更改的选择索引。当行数据绑定时，我绑定下拉列表的数据。但是当我选择数据时，它不会触发改变的选择索引。硬件编码项目列表的另一个下拉列表触发了选择索引的更改。关于这个问题的任何想法，请帮助。下面是代码背后和前端代码。

                <ItemTemplate>
                    <asp:DropDownList ID="ddlItem" runat="server" Width="80%" AutoPostBack="true" OnSelectedIndexChanged="ddlPrice_SelectedIndexChanged"></asp:DropDownList>
                </ItemTemplate>



                <ItemTemplate>
                    <asp:DropDownList runat="server" ID="ddl" AutoPostBack="true" OnSelectedIndexChanged="ddl_SelectedIndexChanged">
                        <asp:ListItem Text="Compliant" Value="0" /> 
                                <asp:ListItem Text="Other Than Serious" Value="1" />
                                <asp:ListItem Text="Serious" Value="2" />
                                <asp:ListItem Text="Critical" Value="3" />

                    </asp:DropDownList>
                </ItemTemplate>

受保护的子Page_Load（ByVal sender As Object，ByVal e As System.EventArgs）处理Me.Load

    Dim oCategoryDetails As New CategoryDetails

    If Not IsPostBack Then
        gdCat.DataSource = oCat.Read
        gdCat.DataBind()
    End If

End Sub

 Dim ddl As DropDownList
        ddl = DirectCast(e.Row.FindControl("ddlItem"), DropDownList)
        If Not ddl Is Nothing Then
            If oDS.Tables.Item(0).Rows.Count > 0 Then
                ddl.DataSource = oDS
                ddl.DataTextField = "ItemName"
                ddl.DataValueField = "ItemPrice"
                ddl.DataBind()
            Else
                ddl.Visible = False
            End If

        End If

        If Me.IsPostBack Then

            If e.Row.RowType = DataControlRowType.DataRow Then
                AddHandler ddl.SelectedIndexChanged, AddressOf ddlPrice_SelectedIndexChanged
            End If
        End If

End Sub

Answer 1

为什么在仅绑定If me.IsPostBack时，在RowDataBound中添加了If Not IsPostBack部分？通常，在aspx标记中添加OnSelectedIndexChanged="ddlPrice_SelectedIndexChanged"就足够了。但是你可以尝试在每个PostBack上的RowCreated中添加处理程序：

Private Sub gdCat_RowCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gdCat.RowCreated
    Select Case e.Row.RowType
        Case DataControlRowType.DataRow
            Dim ddlItem as DropDownList = DirectCast(e.Row.FindControl("ddlItem"),DropDownList)
            AddHandler ddlItem.SelectedIndexChanged, AddressOf ddlPrice_SelectedIndexChanged
    End Select
End Sub

gridview中的dropdownlist不会触发选择索引更改

1 个答案: