c# - 如何在回发时将数据保存在 asp 转发器中

Question

下面是标记页面:

<%@ Page Title="" Language="C#" MasterPageFile="~/Master/MainPage.master" EnableViewState="true" AutoEventWireup="true" CodeBehind="edit.aspx.cs" Inherits="Website.View.edit" %>

...

 <asp:Repeater runat="server" ID="rptSample">
            <ItemTemplate>
                <asp:HyperLink runat="server" ID="refLink" href='http://www.sample.com' Text='Test data' />
                <asp:CheckBox runat="server" ID="chkbxDelete" Text="Delete" />
            </ItemTemplate>
            <SeparatorTemplate>
                <br />
            </SeparatorTemplate>
  </asp:Repeater>

下面是我如何在代码后面绑定(bind)数据:

protected void Page_Load(object sender, EventArgs e)
{
            rptSample.DataSource = getData();
            rptSample.DataBind();
}

这个我也试过:

protected void Page_Load(object sender, EventArgs e)
{
       if(!IsPostBack)
        {
            rptSample.DataSource = getData();
            rptSample.DataBind();
        }
}

并尝试在 btnSave_Click 函数上获取数据

protected void btn_save_Click(object sender, EventArgs e) 
{
  foreach(RepeaterItem item in rptSample.Items) 
  {
    CheckBox chkbx = (CheckBox) item.FindControl("chkbxDelete");
    if (chkbx.Checked) 
    {
        //Do something
    }
  }
}

如果我没有添加 !IsPostBack，rptSample.Items 将为空，但如果我删除它，复选框将始终为 false。

有什么问题？？

---

编辑:根据用户要求，这是完整的页面加载功能:

protected void Page_Load(object sender, EventArgs e)
{
      bindData();
}

protected void bindData()
{
    List<sp_SelectAttachments_Result> attachments = DAL.SelectAttachmentsByID(Request["ID"]);
    if (attachments.Count == 0)
        divAttachments.Visible = false;
    else
    {
        divAttachments.Visible = true;
        rptAttachments.DataSource = attachments;
        rptAttachments.DataBind();
    }
}

这是 divAttachments 和 rptAttachments 的标记页面

<div runat="server" id="divAttachments" visible="false">
        <asp:Repeater runat="server" ID="rptAttachments">
            <ItemTemplate>
                <asp:HiddenField Value='<%# Eval("ID") %>' runat="server" ID="hidID" />
                <asp:HyperLink runat="server" ID="refLink" href='<%# $"/Utils/getFile.ashx?ID={ID}" %>' Text='<%# ((sp_SelectAttachments_Result)Container.DataItem).FileName %>' />
                <asp:CheckBox runat="server" ID="chkbxDeleteAttachment" Text="Delete" />
            </ItemTemplate>
            <SeparatorTemplate>
                <br />
            </SeparatorTemplate>
        </asp:Repeater>
    </div>

Answer 1

我怀疑您的代码中有一些东西可以清除复选框或重置转发器控件的数据源。

我建议创建一个干净的页面并使用下面的代码(我已经测试过并且它有效)。一旦你让它慢慢工作，开始向页面添加任何额外的逻辑，直到你找出导致问题的原因:

代码隐藏:

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        rptSample.DataSource = getData();
        rptSample.DataBind();
    }
}

private List<string> getData()
{
    return new List<string> { "1", "2", "3" };
}

protected void btn_save_Click(object sender, EventArgs e)
{
    foreach (RepeaterItem item in rptSample.Items)
    {
        CheckBox chkbx = (CheckBox)item.FindControl("chkbxDelete");
        if (chkbx.Checked)
        {
            System.Diagnostics.Debugger.Break();
        }
    }
}

.ASPX:

<form id="form1" runat="server">
    <asp:Repeater runat="server" ID="rptSample">
        <ItemTemplate>
            <asp:HyperLink runat="server" ID="refLink" href='http://www.sample.com' Text='Test data' />
            <asp:CheckBox runat="server" ID="chkbxDelete" Text="Delete" />
        </ItemTemplate>
        <SeparatorTemplate>
            <br />
        </SeparatorTemplate>
    </asp:Repeater>
    <asp:Button ID="btn_save" runat="server" Text="Save" OnClick="btn_save_Click" />
</form>