使用哈希表的DataContext（为WPF / XAML绑定） [英] Using Hashtable as DataContext (for WPF/XAML Binding)

问题描述

在code我有一个名为Hashtable的 MyHashtable 。这个哈希表包含键= 价值的元素，值= 3 。我目前正在为这个值到文本框绑定。这是我的XAML code：

In code I have a Hashtable named MyHashtable. This Hashtable contains an element with key="Value", value=3. I'm currently trying to bind this value to a textbox. This is my XAML code:

<TextBlock Margin="4" Text="{Binding MyHashtable[Value]}" />
<TextBlock Margin="4" DataContext="{Binding MyHashtable}" Text="{Binding [Value]}" />

问：为什么第二绑定不能正常工作，而第一份具有约束力的作品好了

Q: Why does the second binding not work, while the first binding works just great?

对于第二个结合我曾尝试其他绑定的文字，如：值，将此[超值] 甚至我[超值] ，但他们都没有工作。

For the second binding I have tried other bindings for the text, such as: Value, this[Value] or even Me[Value], but they all did not work.

使用第[超值] 给我一个有趣的例外：参数数量不匹配
<击>是否有人理解？这是因为C＃和VB.NET之间的差异。见<一href=\"http://stackoverflow.com/questions/14642503/binding-to-multiple-indexed-properties-in-net\">this问题。

Using Item[Value] gives me an interesting exception: Parameter count mismatch. Does somebody understand this? This is because of differences between C# and VB.NET. See this question.

推荐答案

有关第二个选项你可以使用这样的：

For second option you can just use this:

<TextBlock Margin="4" 
     DataContext="{Binding MyHashtable}" 
     Text="{Binding RelativeSource={x:Static RelativeSource.Self},
            Path=DataContext[Value]}" />

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