OnCheckedChange 事件不执行我的事件

Question

我在这里阅读了一些帖子，其中一些与我的问题有关，但由于某种原因，提供的解决方案对我不起作用。基本上我有两个带有复选框的 GridView 控件。它们具有完全相同的代码，但只是触发不同的事件。当然还有不同的 ID 及其相关的唯一信息。这是奇怪的事情，其中​​一个可以正常工作，而另一个不能。我将在此处发布两者，请记住 ID="UnassignElegibilityChk" 的那个是不起作用的。当我从检查中发送回发时，我设置了断点来测试我是否在函数内部。

注意：这两个树视图都在同一个页面上，所以请假设代码隐藏指令和所有设置都正确分配给页面（因为其中一个正在工作，我假设没有问题）

这是不工作的：

   <table><tr><td class="style1">
    <asp:GridView ID="ElegibilitySelectedGridview" runat="server" 
        AutoGenerateColumns="False" DataKeyNames="ID" CellPadding="4" 
        ForeColor="#333333" GridLines="None" Width="475px">
        <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
    <Columns>
        <asp:TemplateField HeaderText="ID">
            <ItemTemplate>
                <asp:Label ID="lblID0" runat="server" Text='<%# Bind("ID") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Select">
            <ItemTemplate>
                <asp:CheckBox ID="UnassignElegibilityChk" runat="server"  AutoPostBack="true" OnCheckedChanged="UnAssignElegibilityRecord"/>
            </ItemTemplate>                   
        </asp:TemplateField>
        <asp:boundfield datafield="Name"  HeaderText="Elegible Item" />
        </Columns>
        <EditRowStyle BackColor="#999999" />
        <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
        <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
        <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
        <SortedAscendingCellStyle BackColor="#E9E7E2" />
        <SortedAscendingHeaderStyle BackColor="#506C8C" />
        <SortedDescendingCellStyle BackColor="#FFFDF8" />
        <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
    </asp:GridView>
    </td></tr></table>

正在运行的如下：

<table><tr><td class="style1">
<asp:DropDownList ID="ElegibilityGroupDDL" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ElegibilityGroupDDL_SelectedIndexChanged">
    <asp:ListItem Value="0">ROOT</asp:ListItem>
</asp:DropDownList>
</td></tr><tr><td class="style1">
    <asp:TextBox ID="ElegibilityNameTxt" runat="server" Width="464px"></asp:TextBox>
    </td></tr><tr><td class="style1">
    <asp:Button ID="ElegibilitySaveBtn" runat="server" Text="Save Elegibility" />
    &nbsp;</td></tr><tr><td class="style1">
    <asp:Label ID="ElegibilityMsgLbl" runat="server" Text="" style="color: #0066CC"></asp:Label>
    </td></tr><tr style="background:silver"><td class="style1">
    &nbsp;</td></tr><tr><td class="style1">

    <asp:GridView ID="ElegibilityGridView" runat="server" 
        AutoGenerateColumns="False" DataKeyNames="ID" BackColor="White" 
        BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px" CellPadding="4" 
        ForeColor="Black" GridLines="Vertical" Width="95%">
        <AlternatingRowStyle BackColor="White" />
    <Columns>
        <asp:TemplateField HeaderText="ID">
            <ItemTemplate>
                <asp:Label ID="lblID" runat="server" Text='<%# Bind("ID") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Select">
            <ItemTemplate>
                <asp:CheckBox ID="AssignElegibilityChk" runat="server" AutoPostBack="true" OnCheckedChanged="AssignElegibility"/>
            </ItemTemplate>                   
        </asp:TemplateField>
        <asp:boundfield datafield="Name"  HeaderText="Elegible Item" />
        </Columns>
        <FooterStyle BackColor="#CCCC99" />
        <HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
        <RowStyle BackColor="#F7F7DE" />
        <SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
        <SortedAscendingCellStyle BackColor="#FBFBF2" />
        <SortedAscendingHeaderStyle BackColor="#848384" />
        <SortedDescendingCellStyle BackColor="#EAEAD3" />
        <SortedDescendingHeaderStyle BackColor="#575357" />
    </asp:GridView>
    </td></tr></table>

工作的gridview成功触发了这个函数：

 Public Sub AssignElegibility()
    If Page.IsPostBack Then
        For Each row As GridViewRow In ElegibilityGridView.Rows
            Dim checkbox As CheckBox = CType(row.FindControl("AssignElegibilityChk"), CheckBox)
            'Check if the checkbox is checked.'
            'value in the HtmlInputCheckBox Value property is set as the //value of the delete commands parameter.'
            If checkbox.Checked Then
                ' Retreive the Employee ID'
                Dim lblID As Label = CType(row.FindControl("lblID"), Label)
                Dim elegibilityID As Integer = Convert.ToInt32(lblID.Text)
                Elegibility.AddElegibilityMapping(CInt(Request("ResID")), elegibilityID)
                ElegibilitySelectedItems(CInt(Request("ResID")))
                ElegibilityGroupDDL_SelectedIndexChanged()
            End If
        Next
    End If
End Sub

不工作的应该触发此代码，但事实并非如此。

Public Sub UnAssignElegibilityRecord(ByVal sender As Object, ByVal e As System.EventArgs)
    PrintLine("Inside the sub")
    If Page.IsPostBack Then
        For Each row As GridViewRow In ElegibilitySelectedGridview.Rows
            Dim checkbox As CheckBox = CType(row.FindControl("UnassignElegibilityChk"), CheckBox)
            'Check if the checkbox is checked.'
            'value in the HtmlInputCheckBox Value property is set as the //value of the delete commands parameter.'
            If checkbox.Checked Then
                ' Retreive the Employee ID'
                Dim lblID As Label = CType(row.FindControl("lblID0"), Label)
                Dim elegibilityID As Integer = Convert.ToInt32(lblID.Text)
                Elegibility.RemoveElegibilityMapping(elegibilityID)
                ElegibilitySelectedItems(CInt(Request("ResID")))
                ElegibilityGroupDDL_SelectedIndexChanged()
            End If
        Next
    End If
End Sub

Answer 1

我不知道以下任何方法是否能解决您的问题，但是...

1. 为什么 CheckedChanged 的​​“工作”处理程序的签名错误？它需要发送者和事件参数。

   protected Sub AssignElegibility(ByVal sender As Object, ByVal e As System.EventArgs)

2. 为什么要迭代 Gridrows 以获取 Checkbox 和已更改的行？这也有效：

   Dim checkbox As CheckBox = DirectCast(sender,CheckBox)

要获得 Row，您只需要将 Checkbox 的 NamingContainer 转换为 GridViewRow。

Dim row as GridViewRow =DirectCast(checkbox.NamingContainer,GridViewRow)

编辑：您是否在回发时重新绑定 ElegibilitySelectedGridview-Grid？ 你应该只在not Page.IsPostback 时这样做，否则事件不会触发。