Question

我有一个数据集,想在一名世界森林论坛——顾问中显示有 containing。问题是,控制是一种电路图。因此,我制作了一个模板,以显示这些价值观,并在我的电路控制中举出多个例子。目前,电线中的XAML编码类似:

<Label Content="{Binding Path=.[0]}" ContentTemplate="{StaticResource ValueTpl}" />
<Label Content="{Binding Path=.[1]}" ContentTemplate="{StaticResource ValueTpl}" />

因此。因此,Im能够以特定位置显示第1行。问题在于,我只能期待正确的秩序。

<Label Content="{Binding Path=.[id=5]}" ContentTemplate="{StaticResource ValueTpl}" />
<Label Content="{Binding Path=.[id=8]}" ContentTemplate="{StaticResource ValueTpl}" />

我读到,应当支持健康倡议,但我无法做到这一点。

Answer 1

如果您有<代码>XPath,则不予支持。

Answer 2

Yes, I need to use XPath, but there s more to it.
My mistakes were:
You can t use a DataSet directly but need to wrap it in a XmlDataDocument
Also my problem involved the namespaces. To surpress them you have to set DataSet.Namespace = String.Empty prior to creating the XmlDataDocument.
If you want to use Namespaces you have to create a XmlNamespaceMappingCollection in XAML like this

<UserControl.Resources>
    <XmlNamespaceMappingCollection x:Key="namespace">
        <XmlNamespaceMapping Prefix="ds" Uri="http://tempuri.org/DataSet.xsd" />
    </XmlNamespaceMappingCollection>
</UserControl.Resources>

In order to reference the namespace in the XPath. Simply adding it as xmlns won t work (as opposed to what I expected).
Then referencing a certain row worked like this:

<Label Content="{Binding XPath= //TableName[4] }" />

如果你使用名称空间,你需要参考<代码>。 XmlNamespaceManager

<Label Content="{Binding XPath= //ds:TableName[4] }" Binding.XmlNamespaceManager="{StaticResource namespace}" />

现在,虽然这种非常简单的XPath工作,但增加一项制约因素将导致完全使用CPU,我的方案不会继续:

<Label Content="{Binding XPath= //TableName[Process = 4] }" />
or
<Label Content="{Binding XPath= //ds:TableName[ds:Process = 4] }" Binding.XmlNamespaceManager="{StaticResource namespace}" />

EDIT It seems like the binding must be in OneTime Mode. Simply changing it to

<Label Content="{Binding Mode=OneTime, XPath= //TableName[Process = 4] }" />

使之发挥作用。我也使用<代码>ContentTemplate,在模板中,约束力可以是TwoWay,但XPath是首要的(例如/Prozess)。

友情链接