C# 我如何在中继器中执行 if 语句
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How can i do an if statement inside a repeater
提问by Monsters
<asp:Repeater>is driving me mad..
<asp:Repeater>快把我逼疯了..
I need to do
我需要去做
<ItemTemplate>
<% if (Container.DataItem("property") == "test") {%>
I show this HTML
<% } else { %>
I show this other HTML
<% } %>
</ItemTemplate>
But I can't for the life of me find any way to make that happen. Ternary isnt any good, because the amount of HTML is quite large, setting labels via a DataBind event is not very good either, as I'd have to have large blocks of HTML in the code-behind.
但是我终其一生都找不到任何方法来实现这一目标。三元没有任何好处，因为 HTML 的数量非常大，通过 DataBind 事件设置标签也不是很好，因为我必须在代码隐藏中有大块的 HTML。
Surely there's a way to do this....
当然有办法做到这一点......
采纳答案by Bruno Reis
You could try creating a kind of ViewModel class, do the decision on your code-behind, and then be happy with your repeater, simply displaying the data that it is being given.
您可以尝试创建一种 ViewModel 类，对您的代码隐藏做出决定，然后对您的转发器感到满意，只需显示它所提供的数据。
This is a way to separate logic from UI. You can then have a dumb-UI that simply displays data, without having to decide on what/how to show.
这是一种将逻辑与 UI 分开的方法。然后，您可以拥有一个简单的显示数据的哑 UI，而不必决定显示什么/如何显示。
回答by Keltex
You could do this with user controls:
您可以使用用户控件执行此操作：
<ItemTemplate>
<uc:Content1 runat='server' id='content1' visible='<%# Container.DataItem("property") == "test" %>'/>
<uc:Content2 runat='server' id='content2' visible='<%# Container.DataItem("property") != "test" %>'/>
</ItemTemplate>
回答by Brian Surowiec
Looks like I got this mixed up with the actual databinding
看起来我把它和实际的数据绑定搞混了
You can do it like so:
你可以这样做：
<asp:Repeater runat="server">
<ItemTemplate>
<% if (((Product)Container.DataItem).Enabled) { %>
buy it now!
<% } else {%>
come back later!
<% } %>
</ItemTemplate>
</asp:Repeater>
<asp:Repeater runat="server">
<ItemTemplate>
<% if (((Product)Container.DataItem).Enabled) { %>
buy it now!
<% } else {%>
come back later!
<% } %>
</ItemTemplate>
</asp:Repeater>
回答by Gavin H
You could use server side visibility:
您可以使用服务器端可见性：
<ItemTemplate>
<div runat="server" visible='<% (Container.DataItem("property") == "test") %>'>
I show this HTML
</div>
<div runat="server" visible='<% (Container.DataItem("property") != "test") %>'>
I show this other HTML
</div>
</ItemTemplate>
回答by RJB
I had a similar problem and stumbled across this page. Thanks for the great answers, Gavin and Keltex got me on the right track but I had a bit of a tricky time getting this to work on my page. Ultimately I was able to get it to work with this boolean, so I wanted to share for posterity:
我有一个类似的问题，偶然发现了这个页面。感谢您提供出色的答案，Gavin 和 Keltex 使我走上了正确的轨道，但让我在我的页面上使用它时遇到了一些棘手的问题。最终我能够让它与这个布尔值一起工作，所以我想为后代分享：
Show Checkbox if false
如果为假则显示复选框
<asp:CheckBox ID="chk_FollowUp" Visible='<%# (DataBinder.Eval(Container.DataItem, "FollowUp").ToString() == "False") %>' runat="server" />
Show Flag img if true
如果为真则显示标志 img
<asp:Image ID="img_FollowUp" AlternateText="Flagged" ImageUrl="Images/flag.gif" runat="server"
Visible='<%# DataBinder.Eval(Container.DataItem, "FollowUp") %>' Height="30" Width="30" />
回答by Dhaval Patel
First You Have to Defind a Count variable in your Page.cs file
首先，您必须在 Page.cs 文件中定义一个 Count 变量
<%if (Count == 0)
{
%>
<div style="background-color:#cfe9ed" class="wid_100 left special_text"><%# Eval("CompanyName") %></div>
<%}
else if (Count == TotalCount - 1)
{
%>
<div style="background-color:#f2f1aa" class="wid_100 left special_text"><%# Eval("CompanyName") %></div>
<%}
else
{
%>
<div class="wid_100 left special_text"><%# Eval("CompanyName") %></div><% } %>
<%Count++; %>
