列表视图/ DetailsView控件：隐藏空场 [英] Listview/DetailsView: Hide a null field

问题描述

我想这是一个相当普遍的问题，但至今我还没有找到一个很好的解决方案。

I imagine this is quite a common problem, but as yet I haven't found an elegant solution.

我公司拥有一批在那里我有任何一个ListView或绑定到一个SQL Server存储过程DetailsView控件实例。我的问题是，有许多情况，其中，当列是空的，我想显示的东西在UI不同。一个典型的例子是，我有一个呈现为一个LinkBut​​ton（在列表视图）或作为HyperLinkField字段（在DetailsViews）的URL列 - 返回NULL URL的时候，我的渲染，没有src属性链接。理想情况下，我的要在这种情况下，以显示任何在该领域

I have a number of instances where I have either a ListView or a DetailsView control that is bound to a SQL Server SProc. The problem I have is that there are numerous instances where, when a column is Null, I want to display something different in the UI. A typical example would be where I have a URL column that is rendered as a LinkButton (in the ListViews) or as a HyperLinkField (in the DetailsViews) - when a Null URL is returned, I'm rendering links with no src attribute. Ideally, I's want to display nothing in this field in such a scenario.

在每种情况下，则返回空值的时候，我怎么能跳过/改变该项目的渲染？

In each of these cases, when a null value is returned, how can I skip/alter the rendering of that item?

先谢谢了。

更新：我还没有机会真正尝试这些了，但都有益的建议。我想我喜欢里克斯回答最好，但再次感谢别人...

Update: I haven't had chance to actually try these out, but all helpful suggestions. I think I like Ricks answer the best, but thanks again to the others...

推荐答案

标记：

 <asp:HyperLink id="whatever" runat="server" 
  NavigateURL='<%# Eval("url") %>' Visible='<%# IsVisible(Eval("url")) %>' />

后面的 code：

protected bool IsVisible(object obj)
{
     bool result = false;

     string url = (string)obj;
     if(!string.IsNullOrEmpty(url))
     {
          result = true;
     }

     return result;

}

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