C# DataGrid 中的 WPF 绑定到 DataContext
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WPF Binding in DataGrid to DataContext
提问by jrich523
I'm having some issues mapping a datagrid combobox ItemsSourceto the main datacontext.
This is some demo code to show the issue.
我在将数据网格组合框映射ItemsSource到主数据上下文时遇到了一些问题。这是一些演示代码来显示问题。
My items class
我的物品类
public class MyData
{
public string Name { get; set; }
public string Priority { get; set; }
}
I created a class to connect to the data context, and it looks like this
我创建了一个类来连接到数据上下文，它看起来像这样
public class myMV
{
public ObservableCollection<MyData> MyItems { get; set; }
public List<string> PriorityTypes
{
get { return new List<string> { "High", "Normal", "Low" }; }
}
public myMV()
{
this.MyItems = new ObservableCollection<MyData>
{
new MyData { Name = "item1", Priority = "Low" },
new MyData { Name = "item2", Priority = "Normal" },
new MyData { Name = "item2", Priority = "High" }
};
}
}
I then create and assign this to the data context in the MainWindows()
然后我创建并将其分配给 MainWindows() 中的数据上下文
public MainWindow()
{
InitializeComponent();
this.DataContext = new myMV();
}
on the xaml side i create a simple datagrid to try and show this like so.
在 xaml 方面，我创建了一个简单的数据网格来尝试像这样显示它。
<DataGrid Grid.Row="1" ItemsSource="{Binding MyItems}" AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Header="Title" Binding="{Binding Name}" Width="*"></DataGridTextColumn>
<DataGridComboBoxColumn Header="Priority" SelectedItemBinding="{Binding Priority}" ItemsSource="{Binding PriorityTypes, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}"/>
</DataGrid.Columns>
</DataGrid>
It's not mapping the Combobox ItemsSourceto the DataContext.PriorityTypes
它没有将 Combobox 映射ItemsSource到 DataContext.PriorityTypes
I also tried (with the same relativesource) to do DataContext.PriorityTypes with no luck. I've come across a few blog posts with no luck but this one shows the method i took. http://sekagra.com/wp/2013/04/dynamic-itemssource-for-combobox-in-a-datagrid/
我也尝试过（使用相同的相对源）做 DataContext.PriorityTypes 没有运气。我遇到了一些没有运气的博客文章，但这一篇显示了我采用的方法。 http://sekagra.com/wp/2013/04/dynamic-itemssource-for-combobox-in-a-datagrid/
This is an over simplified example of my problem, but the key part is the PriorityType must be a List, so i cant do enum.
这是我的问题的一个过于简化的例子，但关键部分是 PriorityType 必须是一个列表，所以我不能做枚举。
Anyone know how to fix this binding?
任何人都知道如何修复此绑定？
采纳答案by Jaykul
I believe the problem you're having has to do with when the DataGridComboBoxColumn does it's databinding -- based on the trace messages, you're not able to get to the parent at all. Replace that column with one that uses a DataTemplate instead:
我相信您遇到的问题与 DataGridComboBoxColumn 进行数据绑定时有关——根据跟踪消息，您根本无法访问父级。将该列替换为使用 DataTemplate 的列：
<DataGridTemplateColumn Header="Priority" Width="100">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox SelectedItem="{Binding Priority}" ItemsSource="{Binding DataContext.PriorityTypes, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
You can even get fancy and use a separate template for display...
您甚至可以花哨并使用单独的模板进行显示...
<DataGridTemplateColumn Header="Priority" Width="100">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Label Content="{Binding Priority}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<ComboBox SelectedItem="{Binding Priority}" ItemsSource="{Binding DataContext.PriorityTypes, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}" />
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
