How to pull a type of item from a list view
More specificly I want to be able to gather the Labels I have in my ListView's Item template into a list.
This was my latest attempt at it and sadly I am still falling short.
foreach (Label lbl in ListView.Items.Where(r => r.ItemType == Label))
This is my ASP Control:
<asp:ListView ID="ListView1" runat="server" Visible="false" ItemPlaceholderID="phItem"
OnItemDataBound="ListView1_ItemDataBound">
<LayoutTemplate>
<html>
<head>
</head>
</head>
<body>
<table>
<asp:PlaceHolder ID="phItem" runat="server" />
</table>
</body>
</html>
</LayoutTemplate>
<ItemTemplate>
<tr>
<td>
<asp:Label ID="lblChecklist" runat="server" />
</td>
<td>
<asp:Label ID="lblCompliant" runat="开发者_运维问答server" />
</td>
<td>
<asp:Label ID="lblNonCompliant" runat="server" />
</td>
<td>
<asp:Label ID="lblNotApplicable" runat="server" />
</td>
<td>
<asp:Label ID="lblNotComplete" runat="server" />
</td>
<td>
<asp:Label ID="lblTotal" runat="server" />
</td>
</tr>
</ItemTemplate>
<EmptyDataTemplate>
There are not results that match your input paramaters.
</EmptyDataTemplate>
</asp:ListView>
I've been looking to pull the Labels and now when I look at ListView1.Items during runtime I find the ListView1.Items.Count = 0.
I can pull the Labels individually by their name but I want to pull them so I can get out of hardcoding it.
I think the LINQ statement you want is something like:
var myLabels = listView1.Items
.Where(i => i.ItemType == ListViewItemType.DataItem)
.Select(a => a.FindControl("myLabel"));
You want to use FindControl on each item to get to the Label control you added in the ItemTemplate. Remember that Items is just a list of ListViewDataItems, so you won't be able to select the labels right out of it, even if they are the only thing in the template.
Here's a full working example I threw together.
<%@ Page Language="C#" AutoEventWireup="true" %>
<html>
<body>
<form id="form1" runat="server">
<asp:ListView ID="listView1" runat="server">
<ItemTemplate>
<asp:Label ID="myLabel" Text="<%# Container.DataItem %>" runat="server" /><br />
</ItemTemplate>
</asp:ListView>
<asp:Button ID="btnGatherLabels" Text="Gather Labels" OnClick="btnGatherLabels_Click" runat="server" />
</form>
</body>
</html>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if(!Page.IsPostBack)
{
var myItems = new[] { "item1", "item2", "item3" };
listView1.DataSource = myItems;
listView1.DataBind();
}
}
public void btnGatherLabels_Click(object sender, EventArgs e)
{
var myLabels = listView1.Items
.Where(i => i.ItemType == ListViewItemType.DataItem)
.Select(a => a.FindControl("myLabel"));
foreach(Label myLabel in myLabels)
Response.Write(string.Concat(myLabel.Text, "<br />"));
}
</script>
EDIT
Building off my earlier example, let's say the ItemTemplate has multiple labels:
<ItemTemplate>
<asp:Label ID="myLabel1" Text="Label Here:" runat="server" />
<asp:Label ID="myLabel2" Text="<%# Container.DataItem %>" runat="server" />
<asp:TextBox ID="filler" runat="server" /><br />
</ItemTemplate>
The following code will bring back and display the text for each label in each template:
public void btnGatherLabels_Click(object sender, EventArgs e)
{
var myLabelCols = listView1.Items
.Where(i => i.ItemType == ListViewItemType.DataItem)
.Select(a =>
a.Controls.Cast<Control>()
.Where(b => b.GetType().Equals(typeof(Label)))
);
foreach (var myLabels in myLabelCols)
foreach (Label myLabel in myLabels)
Response.Write(string.Concat(myLabel.Text, "<br />"));
}
I'm not sure how you need to use this data, so I did not join them together in one list. Each element in the myLabelCols contains a list of all of the labels in that template.
加载中,请稍侯......
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