我有ObservableCollection
个对象。这些对象显示在DataGrid
&一个`SelectedObject
我有一个属性PossibleParentObjects
,它根据SelectedObject返回List
个对象。
我希望此属性填充ComboBox
DataGrid
我该怎么做?
这是我到目前为止......显然没有工作:
<DataGrid Grid.Row="1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
AlternatingRowBackground="AntiqueWhite" AlternationCount="2"
ItemsSource="{Binding AllObjects, UpdateSourceTrigger=PropertyChanged}"
SelectedItem="{Binding SelectedObject}"
CanUserAddRows="True" CanUserDeleteRows="True"
AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Name, Mode=TwoWay}" Header="Name"/>
<DataGridTextColumn Binding="{Binding Abbr, Mode=TwoWay}" Header="Abbreviation"/>
<DataGridComboBoxColumn Header="Parent Object" Width="120"
SelectedItemBinding="{Binding Path=Id, UpdateSourceTrigger=PropertyChanged}"
DisplayMemberPath="Name"
ItemsSource="{Binding Path=AllObjects,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}">
</DataGridComboBoxColumn>
<DataGridTextColumn Binding="{Binding Desc, Mode=TwoWay}" Header="Description"/>
</DataGrid.Columns>
<i:Interaction.Triggers>
<i:EventTrigger EventName="CurrentCellChanged">
<i:InvokeCommandAction Command="{Binding DataGridChanged}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</DataGrid>
答案 0 :(得分:2)
请参阅讨论类似问题的this Stackoverflow question。
基本思路如下:
这样,每当用户更改他想要查看的行时,它将自动检索正确的对象并填充组合框列。 换句话说,您不能使用组合框的源检索它,但是在更改所选行时检索它。您必须这样做 - 财产系统不允许参数。
我知道这是我在这里给出的一般描述,而不是代码,但我认为你会得到这个要点。
答案 1 :(得分:1)
这是最终为我工作的代码。这是“答案”,但Nepdev的答案让我来到这里。希望这会帮助其他人尝试做类似的事情。
<DataGrid HorizontalAlignment="Stretch" VerticalAlignment="Stretch" HeadersVisibility="Column"
AlternatingRowBackground="AntiqueWhite" AlternationCount="2"
ItemsSource="{Binding EquipLocations, UpdateSourceTrigger=PropertyChanged}"
SelectedItem="{Binding SelectedItem}"
CanUserAddRows="True" CanUserDeleteRows="True"
AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Name, Mode=TwoWay}" Header="Name"/>
<DataGridTextColumn Binding="{Binding Abbr, Mode=TwoWay}" Header="Abbreviation"/>
<DataGridComboBoxColumn Header="Uses Location" Width="120"
SelectedValueBinding="{Binding Path=ParentObjectId, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"
SelectedValuePath="Id"
DisplayMemberPath="Abbr">
<DataGridComboBoxColumn.ElementStyle>
<Style TargetType="ComboBox">
<Setter Property="ItemsSource" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}},
Path=DataContext.AllPossibleObjects}"/>
</Style>
</DataGridComboBoxColumn.ElementStyle>
<DataGridComboBoxColumn.EditingElementStyle>
<Style TargetType="ComboBox">
<Setter Property="ItemsSource" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}},
Path=DataContext.PossibleParentObjects}"/>
</Style>
</DataGridComboBoxColumn.EditingElementStyle>
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectionChanged">
<i:InvokeCommandAction Command="{Binding DataGridChanged}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</DataGridComboBoxColumn>
<DataGridTextColumn Binding="{Binding Desc, Mode=TwoWay}" Header="Description"/>
</DataGrid.Columns>
<i:Interaction.Triggers>
<i:EventTrigger EventName="CurrentCellChanged">
<i:InvokeCommandAction Command="{Binding DataGridChanged}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</DataGrid>