C# 循环遍历中继器项目
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Looping through repeater items
提问by TMB87
I have a repeater which is built like the following:
我有一个中继器，其结构如下：
<asp:Repeater runat="server" ID="rptItems" OnItemDataBound="rptItems_ItemDataBound">
<ItemTemplate>
<div class="span12 grey-box">
<div class="hero-block3">
<div class="row show-grid">
<div class="span9">
<div class="hero-content-3">
<h2><asp:Literal ID="ltrName" runat="server"></asp:Literal></h2>
<p><asp:Literal ID="ltrDescription" runat="server"></asp:Literal></p>
</div>
</div>
<div class="span3">
<asp:Panel ID="pnlAmount" runat="server">
<div class="tour-btn" id="divAmount" runat="server">
<small>How Many?<br /></small>
<asp:TextBox runat="server" ID="tbox" Width="40"></asp:TextBox>
</div>
</asp:Panel>
</div>
</div>
</div>
</div>
<div class="clear-both"></div>
<br />
</ItemTemplate>
</asp:Repeater>
It's bound using:
它绑定使用：
ListProducts = db.GetDataTable("select * from Products where Id in (" + selectedValues + ")");
rptItems.DataSource = ListProducts;
rptItems.DataBind();
And then extra stuff is done with:
然后额外的东西完成了：
protected void rptItems_ItemDataBound(object sender,
System.Web.UI.WebControls.RepeaterItemEventArgs e)
{
DataRowView nRow = null;
switch (e.Item.ItemType)
{
case ListItemType.Item:
case ListItemType.AlternatingItem:
nRow = (DataRowView)e.Item.DataItem;
((Literal)e.Item.FindControl("ltrDescription")).Text = "" + nRow["Description"];
((Literal)e.Item.FindControl("ltrName")).Text = "" + nRow["Name"];
if ("" + nRow["HasAmount"] == "False")
{
((Panel)e.Item.FindControl("pnlAmount")).Visible = false;
}
break;
}
}
However, now on an onclick event for the page, i'm trying to save the information stored - This is what i've done so far, but it always all seems to be null, and I can't add a .text etc to the end of the (TextBox)item.FindControl("tbSelected");
但是，现在在页面的 onclick 事件上，我正在尝试保存存储的信息 - 这是我到目前为止所做的，但它似乎总是为空，并且我无法添加 .text 等到最后 (TextBox)item.FindControl("tbSelected");
Heres my loop i'm trying on click:
这是我尝试点击的循环：
protected void doStageThree(object sender, EventArgs e)
{
foreach (RepeaterItem item in rptItems.Items)
{
if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem)
{
var tbSelected = (TextBox)item.FindControl("tbSelected");
var lblDescription = (Literal)item.FindControl("ltrDescription");
var lblName = (Literal)item.FindControl("ltrName");
}
}
}
采纳答案by gzaxx
It is always null because there is no TextBoxwith id tbSelected
它始终为空，因为没有TextBoxwith idtbSelected
<asp:TextBox runat="server" ID="tbox" Width="40"></asp:TextBox>
change it to:
将其更改为：
var tbSelected = (TextBox)item.FindControl("tbox");
To protect your code from null use keyword as:
为了保护您的代码免受空值使用关键字as：
var tbSelected = item.FindControl("tbox") as TextBox;
if (tbSelected != null)
{
//textbox with id tbox exists
tbSelected.Text = "your text";
}
回答by Mikey Mouse
Try replacing
尝试更换
foreach (RepeaterItem item in rptItems.Items)
with
和
foreach (Control c in rptItems.Items)
{
if(c.FindControl("tbSelected") != null)
{
var selectedText = ((TextBox)c.FindControl("tbSelected")).Text;
}
}
