访问DataGridCells之间的控件，动态级联ComboBoxes [英] Accessing control between DataGridCells, dynamic cascading ComboBoxes

问题描述

我有一个DataGrid的两个列是ComboBoxes（一个包含少数但不是这是问题）。

I have a DataGrid that two of its columns are ComboBoxes (one contains few but not this is the problem).

我想，当用户更改首先Combo的值，ComboBox在其他列应该绑定到其属性（这个属性是一个集合）。说的第一个ComboBox是类别，我想当用户更改其值时，另一个CB填充（第一个组合的所选类别）.Vendors的值。

I want, that when the user changes the first Combo's value, the ComboBox in the other column should bind to a property of its (this property is a collection). Say the First ComboBox is Category, I want that when the user changes its value, the other CB is populated with the values of (first combo's selected category).Vendors.

我应该怎么做，我不使用MVVM，只是简单的WPF。
我不知道应该是什么正确的方式来实现它，我希望我开始正确。

How should I do it, I don't use MVVM, just simple WPF. I don't know what should be the right way to implement it, I hope I started it right.

我想，如果我能得到另一个ComboBox（它位于不同的DataGridCell）从第一个SelectionChangeHandler将是最好的，因为然后我可以重置其源第一个选择更改的源。
注意，我有能力到达当前（第一个）DataGridCell，我只是寻找一个有效的方式访问正确的DataGridCell兄弟，然后得到它的子（第二）组合。

I think, if I could get the other ComboBox (which is located in a different DataGridCell) from the first's SelectionChangeHandler that would be the best, because then I can reset its source on each selection change of the first one. Note that I have the capability of reaching the current (the first's) DataGridCell, I am just looking for an efficient way to access the right DataGridCell sibling and then get its child (second) combo.

另外请注意，所选类别应该在行与行之间变化，第二个ComboBox应该依赖于该行的类别。

我实际上试图实现它，使CollectionViewSource .Source绑定到当前项目（即行的DataContext），但它似乎不工作。

我更喜欢通过一个Action触发器或处理程序设置第二个组合的CollectionViewSource（VendorsCollection）在第1 ComboBox的SelectionChange。

Also note that the selected category should vary from row to row, and the second ComboBox should depend on this row's category.
I actually tried to implement it so that the CollectionViewSource.Source is bound to the current item (i.e. the row's DataContext) but it doesn't seem to work.
I prefer to set the second combo's CollectionViewSource (VendorsCollection) thru an Action trigger or handler at the 1st ComboBox's SelectionChange.

该字段中的其他ComboBoxs似乎没有问题，因为他们都是绑定在一起的，我可能使用CollectionViewSource.Filter，反正它不是一个问题，访问他们，因为他们是简单的兄弟姐妹，而不是像第一个是一个遥远的表弟位于深处另一个DataGridCell。

The other ComboBoxes in that field don't seem to make a problem as they're all bound to each other, I might use CollectionViewSource.Filter, anyway it's not a problem to access them as they are simple siblings, not like the first one which is a distant cousin located deep in another DataGridCell.

这是什么是什么尝试到目前为止：

Here is what is what I tried so far:

<DataGrid>
    <DataGrid.Resources>
        <CollectionViewSource x:Key="CategoriesCollection" Source="{Binding Context.CategoriesList, Source={x:Static Application.Current}, IsAsync=True}" />
    </DataGrid.Resources>

    <DataGrid.Columns>

        <DataGridTemplateColumn Header="Category">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <TextBlock DataContext="{Binding Category}" Text="{Binding Title}"/>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
            <DataGridTemplateColumn.CellEditingTemplate>
                <DataTemplate>
                    <!--This is the first ComboBox-->
                    <ComboBox
                                IsSynchronizedWithCurrentItem="False"
                                ItemsSource="{Binding Source={StaticResource CategoriesCollection}}"
                                DisplayMemberPath="Title"
                                SelectionChanged="cbCategories_SelectionChanged"
                                SelectedItem="{Binding Category}"/>
                </DataTemplate>
            </DataGridTemplateColumn.CellEditingTemplate>
        </DataGridTemplateColumn>

        <DataGridTemplateColumn Header="Style">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <StackPanel>
                        <TextBlock DataContext="{Binding Finish.Style.Vendor}" Text="{Binding Contact.Title}"/>
                        <TextBlock DataContext="{Binding Finish.Style}" Text="{Binding Title}"/>
                        <TextBlock Text="{Binding Finish.Title}"/>
                    </StackPanel>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
            <DataGridTemplateColumn.CellEditingTemplate>
                <DataTemplate>
                    <StackPanel>
                        <StackPanel.Resources>
                            <!--I want, that when the user selects a value in the first ComboBox,
                    the VendorsCollection below should be populated with the selected Category.Vendors,
                    or alternatively current row's data item.Category.Vendors,
                    I just donno how to access current row from these resources.-->
                            <CollectionViewSource x:Key="VendorsCollection" Source="{Binding Vendors, Source={StaticResource CategoriesCollection}}" />
                            <CollectionViewSource x:Key="StylesCollection" Source="{Binding Styles, Source={StaticResource VendorsCollection}}" />
                            <CollectionViewSource x:Key="FinishesCollection" Source="{Binding Finishes, Source={StaticResource StylesCollection}}" />
                        </StackPanel.Resources>
                        <ComboBox                                                       
                                    IsSynchronizedWithCurrentItem="True"
                                    ItemsSource="{Binding Source={StaticResource VendorsCollection}}"
                                    SelectedItem="{Binding Finish.Style.Vendor}"
                                    DisplayMemberPath="Contact.Title"/>
                        <ComboBox
                                    IsSynchronizedWithCurrentItem="True"
                                    ItemsSource="{Binding Source={StaticResource StylesCollection}}"
                                    SelectedItem="{Binding Finish.Style}"
                                    DisplayMemberPath="Title"/>
                        <ComboBox
                                    IsSynchronizedWithCurrentItem="True"
                                    ItemsSource="{Binding Source={StaticResource FinishesCollection}}"
                                    SelectedItem="{Binding Finish}"
                                    DisplayMemberPath="Title"/>
                    </StackPanel>
                </DataTemplate>
            </DataGridTemplateColumn.CellEditingTemplate>
        </DataGridTemplateColumn>

    </DataGrid.Columns>
</DataGrid>

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