.net 在 WPF 数据网格文本列中绑定
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Binding in a WPF data grid text column
提问by Matthew Maravillas
I'm trying to build a data grid where one of the columns is a font name displayed in that font. Previously, I was working with a list box where I had defined the following template:
我正在尝试构建一个数据网格，其中一列是以该字体显示的字体名称。以前，我使用一个列表框，在其中定义了以下模板：
<TextBlock Text="{Binding Path=Name}" FontFamily="{Binding Path=Name}"/>
This worked just fine. So, I tweaked the data structure (Name became Font.Name) and moved onto a data grid to try this:
这工作得很好。所以，我调整了数据结构（Name 变成了 Font.Name）并移动到数据网格上来试试这个：
<dg:DataGridTextColumn Binding="{Binding Font.Name}"
FontFamily="{Binding Font.Name}" IsReadOnly="True" Header="Font"/>
Now the font names are all displayed in the default font, and I get this error:
现在字体名称都以默认字体显示，我收到此错误：
System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or
FrameworkContentElement for target element.
BindingExpression:Path=Font.Name; DataItem=null; target element is
'DataGridTextColumn' (HashCode=56915998); target property is 'FontFamily'
(type 'FontFamily')
A few Google results dealing with custom controls suggest changing the property from DependencyObject to FrameworkElement, but I'd have to inherit DataGridTextColumn and define my own property to do so - there must be a better way.
一些处理自定义控件的 Google 结果建议将属性从 DependencyObject 更改为 FrameworkElement，但我必须继承 DataGridTextColumn 并定义我自己的属性来这样做 - 必须有更好的方法。
I've tried several different approaches to the binding, including attempting to change just the font size with a distinct property in my data class (i.e., FontSize="{Binding FontSize}"). They've all resulted in the same error as above.
我尝试了几种不同的绑定方法，包括尝试在我的数据类（即FontSize="{Binding FontSize}"）中使用不同的属性仅更改字体大小。他们都导致了与上述相同的错误。
Anyone know what I'm doing wrong here?
有谁知道我在这里做错了什么？
Edit:
编辑：
Thanks to Jared's reply, I found the following:
感谢 Jared 的回复，我发现了以下内容：
The method looks sound, but I need to make a binding that references the correct element in the DataContext for each row, as opposed to sharing a single value for the entire column.
该方法看起来不错，但我需要进行绑定以引用 DataContext 中每一行的正确元素，而不是为整列共享单个值。
Code behind:
后面的代码：
fontDataGrid.DataContext = from font
in new InstalledFontCollection().Families;
XAML:
XAML：
Binding="{Binding Font.Name}"
FontFamily="{Binding (FrameworkElement.DataContext).Font.Name,
RelativeSource={x:Static RelativeSource.Self}}"
Using the above XAML clearly isn't correct, because DataContext is the entire collection of fonts. But I can't index the collection, since I don't know what the row number is (or do I?). Is there some approach I can use to achieve this?
使用上面的 XAML 显然是不正确的，因为 DataContext 是整个字体集合。但是我无法索引集合，因为我不知道行号是什么（或者我不知道？）。有什么方法可以用来实现这一目标吗？
And a secondary question - why does the Binding attribute seem to work just fine, even without the DataContext? Is it looking at ItemsSource instead?
还有一个次要问题 - 为什么即使没有 DataContext Binding 属性似乎也能正常工作？它是在查看 ItemsSource 吗？
采纳答案by Matthew Maravillas
Jared's answer is correct, but I've found a concrete solution that's solved my problem.
Jared 的回答是正确的，但我找到了解决我问题的具体解决方案。
Following this example, I changed my DataGridTextColumn definition to:
按照这个示例，我将 DataGridTextColumn 定义更改为：
<dg:DataGridTextColumn Binding="{Binding Font.Name}" IsReadOnly="True" Header="Font">
<dg:DataGridTextColumn.ElementStyle>
<Style TargetType="TextBlock">
<Setter Property="FontFamily" Value="{Binding Font.Name}" />
</Style>
</dg:DataGridTextColumn.ElementStyle>
</dg:DataGridTextColumn>
And I don't need to worry about the column inheriting the DataContext. This gives me the result I want.
而且我不需要担心继承 DataContext 的列。这给了我想要的结果。
回答by Bryan Anderson
Try
尝试
TextBlock.FontFamily="{Binding Font.Name}"
Sometimes the binding system has a problem finding where a property is declared so you need to give it some help.
有时绑定系统在查找属性声明的位置时会出现问题，因此您需要提供一些帮助。
