wpf 如何使用绑定将 RowDefinition 或 ColumnDefinition 动态添加到网格？
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How to dynamically add RowDefinition or ColumnDefinition to a Grid with binding?
提问by Bizhan
I'm trying to create a table with a variable number of rows and columns. I'm doing this with an ItemsControlwhich has a Gridas its ItemsPanel. And I know I can set Grid.Rowand Grid.Columnof each item through its ItemContainerStyle. But I don't know how to change the number of rows and columns and their sizeswhen I can't access the Grid by its name.
我正在尝试创建一个具有可变行数和列数的表。我正在用ItemsControlaGrid作为它的ItemsPanel. 我知道我可以设置Grid.Row和Grid.Column每个项目通过的ItemContainerStyle。但是当我无法通过名称访问 Grid 时，我不知道如何更改行数和列数及其大小。
Question:
题：
How can you modify RowDefinitionsor ColumnDefinitionsof a Gridin run-time without any code-behindusing Binding?
你如何修改RowDefinitions或ColumnDefinitions的Grid在运行时无需任何代码隐藏使用绑定？
This is the XAML code:
这是 XAML 代码：
<ItemsControl Name="myItemsControl" ItemsSource="{Binding Cells}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<Grid Name="myGrid">
<Grid.RowDefinitions>
<!-- unknown number of rows are added here in run-time -->
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<!-- known number of columns are added here in run-time -->
</Grid.ColumnDefinitions>
</Grid>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemContainerStyle>
<Style.../>
</ItemsControl.ItemContainerStyle>
</ItemsControl>
I tried to add some RowDefinitionin code behind but I couldn't find a way to gain access to myGridby its name (or any other way) since it is inside an ItemsPanelTemplate.
我试图RowDefinition在后面的代码中添加一些，但我找不到myGrid通过其名称（或任何其他方式）访问的方法，因为它位于ItemsPanelTemplate.
I'm wondering if is there any way to programmatically add or modify RowDefinitionsin run-time?
我想知道是否有任何方法可以在运行时以编程方式添加或修改RowDefinitions？
回答by Rachel
You can use attached propertiesfor a Gridthat modify the RowDefinitionsand ColumnDefinitionswhen those properties are set or changed.
您可以使用附加属性来Grid修改这些属性RowDefinitions以及ColumnDefinitions何时设置或更改这些属性。
It will allow you to write your Gridlike this:
它将允许您Grid像这样写：
<Grid local:GridHelpers.RowCount="{Binding MaxGridRow}"
local:GridHelpers.ColumnCount="3" />
Then just expose a property from your ViewModelwhich returns the largest row number in the Cellscollection.
然后从您的属性中公开一个属性，ViewModel该属性返回Cells集合中的最大行号。
You can find a detailed implementation of those properties on my blog.
您可以在我的博客上找到这些属性的详细实现。
回答by Y.Yanavichus
If you had access to the grid from code-behind you could do this:
如果您可以从代码隐藏访问网格，则可以执行以下操作：
var rowDefinition = new RowDefinition();
rowDefinition.Height = GridLength.Auto;
grid.RowDefinitions.Add(rowDefinition);
