Question

我会尝试解释我的问题并尝试编写一个示例，但是在asp.net和C＃中。

我有一个转发器，里面有一堆复选框。该表的布局类似于......

<ItemTemplate>
    <tr>
        <td><%#Eval("question")%></td>
        <td><a href="edit.aspx?id=<%#Eval('id')%>">Edit</a></td>
        <td>Applies to the following</td>
        <td><asp:CheckBox id="chkModel_A" runat="server" Text="Model A" /></td>
        <td><asp:CheckBox id="chkModel_B" runat="server" Text="Model B" /></td>
        <td><asp:CheckBox id="chkModel_C" runat="server" Text="Model C" /></td>
    </tr>
<ItemTemplate>

当它数据绑定时，它会收到问题，ID和第一次检查的模型列表......所以

问题1 ..（ID）10 ... A C ...

但是如何检查chkModel_A和chkModel_C，因为它们在转发器中，我可以在这个表中有多个问题，所以当它问题2时它不会得到A C并得到任何问题2。目前，它只检查最后一个或者它是第一个数据表问题。谢谢你的帮助！

我忘了添加数据绑定...

protected void rptQs_ItemDataBound(object sender, RepeaterItemEventArgs e) {
        RepeaterItem ri = e.Item;
        foreach(string model in modelsSplit) {
            CheckBox cb = (CheckBox) ri.FindControl("chkModel_" + model);
            if (cb != null) {
                cb.Checked = true;
             }
         }
}

这是数据绑定后的结果。

<table>
    <tr>
        <td>This is question 1</td>
        <td><a href="edit.aspx?id=1">Edit</a></td>
        <td>Applies to the following</td>
        <td><asp:CheckBox id="chkModel_A" runat="server" Text="Model A" Checked="true" /></td>
        <td><asp:CheckBox id="chkModel_B" runat="server" Text="Model B" /></td>
        <td><asp:CheckBox id="chkModel_C" runat="server" Text="Model C" Checked="true" /></td>
    </tr>
    <tr>
        <td>This is question 2</td>
        <td><a href="edit.aspx?id=2">Edit</a></td>
        <td>Applies to the following</td>
        <td><asp:CheckBox id="chkModel_A" runat="server" Text="Model A" Checked="true" /></td>
        <td><asp:CheckBox id="chkModel_B" runat="server" Text="Model B" /></td>
        <td><asp:CheckBox id="chkModel_C" runat="server" Text="Model C" Checked="true" /></td>
    </tr>
    <tr>
        <td>This is question 3</td>
        <td><a href="edit.aspx?id=3">Edit</a></td>
        <td>Applies to the following</td>
        <td><asp:CheckBox id="chkModel_A" runat="server" Text="Model A" Checked="true" /></td>
        <td><asp:CheckBox id="chkModel_B" runat="server" Text="Model B" /></td>
        <td><asp:CheckBox id="chkModel_C" runat="server" Text="Model C" Checked="true" /></td>
    </tr>
</table>

我试图让表格中的每一行都选中正确的复选框。相反，所有这些都以相同的方式进行检查。我无法正确显示问题2或3。希望有助于解释。

Answer 1

您遇到的问题是您无法访问并因此操纵代码隐藏中的复选框元素。正确？

要解决此问题，您必须使用FindControl找到控件。如下所示：

你的aspx：

// Set the OnItemDataBound attribute of your repeater 
<asp:Repeater ID="yourRepeaterId" runat="server" OnItemDataBound="SomeFunctionName">
    <ItemTemplate>
        <tr>
            <td><%#Eval("question")%></td>
            <td><a href="edit.aspx?id=<%#Eval('id')%>">Edit</a></td>
            <td>Applies to the following</td>
            <td><asp:CheckBox id="chkModel_A" runat="server" Text="Model A" /></td>
            <td><asp:CheckBox id="chkModel_B" runat="server" Text="Model B" /></td>
            <td><asp:CheckBox id="chkModel_C" runat="server" Text="Model C" /></td>
        </tr>
    <ItemTemplate>
</asp:Repeater>

在您的代码后面文件：

void SomeFunctionName(object sender, RepeaterItemEventArgs e)
{
    Checkbox chkbox_A = (Checkbox)e.Item.FindControl("chkModel_A");
    Checkbox chkbox_B = (Checkbox)e.Item.FindControl("chkModel_B");
    Checkbox chkbox_C = (Checkbox)e.Item.FindControl("chkModel_C");
    // Use or manipulate chkbox_A, chkbox_B, chkbox_C as per your requirements...
}

上述技术可用于指代转发器内的任何内容，甚至是另一个转发器（在嵌套转发器的情况下）。我希望这有帮助...

Answer 2

您想将 e.Item.DataItem 投射到 ItemDataBound 事件中的相应对象。

enter image description here

ASPX

<asp:Repeater ID="Repeater1" runat="server" OnItemDataBound="Repeater1_ItemDataBound">
    <ItemTemplate>
        <table>
            <tr>
                <td><%#Eval("question")%></td>
                <td><a href="edit.aspx?id=<%# Eval("id") %>">Edit</a></td>
                <td>Applies to the following</td>
                <td>
                    <asp:CheckBox ID="chkModel_A" runat="server" Text="Model A" /></td>
                <td>
                    <asp:CheckBox ID="chkModel_B" runat="server" Text="Model B" /></td>
                <td>
                    <asp:CheckBox ID="chkModel_C" runat="server" Text="Model C" /></td>
            </tr>
        </table>
    </ItemTemplate>
</asp:Repeater>

代码背后

public class Test
{
    public int Id { get; set; }
    public string Question { get; set; }
    public bool A { get; set; }
    public bool B { get; set; }
    public bool C { get; set; }
}

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        Repeater1.DataSource = new List<Test>()
        {
            new Test { Id = 1, Question = "One", A = true, B = false, C = true},
            new Test { Id = 2, Question = "Two", A = false, B = true, C = true},
            new Test { Id = 3, Question = "Three", A = false, B = true, C = true},
        };
        Repeater1.DataBind();
    }
}

protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || 
        e.Item.ItemType == ListItemType.AlternatingItem)
    {
        RepeaterItem item = e.Item;
        var test = e.Item.DataItem as Test;

        var a = item.FindControl("chkModel_A") as CheckBox;
        a.Checked = test.A;

        var b = item.FindControl("chkModel_B") as CheckBox;
        b.Checked = test.B;

        var c = item.FindControl("chkModel_C") as CheckBox;
        c.Checked = test.C;
    }
}

在转发器中仅查找某些重复的复选框

2 个答案:

ASPX

代码背后