[英]How do I use Eval() to reference values in a SortedDictionary in an asp Repeater?
I thought I was clever to switch from the memory intensive DataView to SortedDictionary as a memory efficient sortable data structure. 我认为我很聪明地从内存密集型DataView切换到SortedDictionary,以实现内存高效的可排序数据结构。 Now I have no idea how get the key and value out of the datasource in the <%# or Eval() expressions.
现在,我不知道如何在<%#或Eval()表达式中从数据源中获取键和值。
SortedDictionary<int, string> data = RetrieveNames();
rCurrentTeam.DataSource = data;
rCurrentTeam.DataBind();
<asp:Repeater ID="rNames" runat="server">
<ItemTemplate>
<asp:Label ID="lblName" runat="server" Text='<%# Eval("what?") %>' />
</ItemTemplate>
</asp:Repeater>
Any suggestions? 有什么建议么?
Use either of these two options: 使用以下两个选项之一:
<%# Eval("Key") %>
<!-- or -->
<%# Eval("Value") %>
depending on whether you need the key or the value from the dictionary. 取决于您需要键还是字典中的值。
This makes sense if you think about how data binding works. 如果您考虑数据绑定是如何工作的,这是有道理的。 Data binding is a process by which a control takes an enumerable sequence, iterates that sequence, and uses reflection to extract values from each item in the sequence based on properties that the item exposes.
数据绑定是一个过程,控件通过该过程获取一个可枚举的序列,对该序列进行迭代,并使用反射根据项目所公开的属性从序列中的每个项目中提取值。
Since SortedDictionary<TKey,TValue>
implements the IEnumerable<KeyValuePair<TKey, TValue>>
interface you know that the repeater will enumerate a sequence of KeyValuePair<TKey, TValue>
objects, binding to each one in turn. 由于
SortedDictionary<TKey,TValue>
实现IEnumerable<KeyValuePair<TKey, TValue>>
接口,您知道转发器将枚举KeyValuePair<TKey, TValue>
对象的序列,依次绑定到每个对象。
If you look at the properties that are exposed by the KeyValuePair<TKey,TValue>
class you will see just two: Key
and Value
. 如果查看由
KeyValuePair<TKey,TValue>
类公开的属性,则只会看到两个: Key
和Value
。 Since they are public properties you can Eval
them and the control will be able to extract the values that they encapsulate. 由于它们是公共属性,因此您可以
Eval
它们,并且控件将能够提取它们封装的值。
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