用不同类型绑定ComboBox中的SelectedItem [英] Binding SelectedItem of ComboBox in DataGrid with different type

问题描述

我有一个DataGrid，其中包含ComboBox作为列。

I have a DataGrid which contains ComboBox as column.

让我们考虑将ItemsSource作为ObservableCollection并且ComboBox ItemsSource是List的DataGrid。

Let consider DataGrid having ItemsSource as ObservableCollection and ComboBox ItemsSource is List .

我要设置ComboBox SelectedItem属性基于DataGrid ItemsSource中的属性。

I want to set the ComboBox SelectedItem property based on property in DataGrid ItemsSource.

但是Product类的属性ProductTypeId的类型为int而不是ProductType。

However Product class has property ProductTypeId of type int and not ProductType.

所以我该如何设置ComboBox SelectedItem以便将 Product.ProductTypeId的值显示为选中状态。
而且我还想将SeletedItems与Mode = TwoWay绑定，以便每当ComboBox SelectedItem更改时，它将反映在DataGrid的ItemsSource中。

So how can I set ComboBox SelectedItem so that it display value of Product.ProductTypeId as selected. And also I want to bind SeletedItems with Mode = TwoWay so that whenever ComboBox SelectedItem changes it will be reflected in DataGrid's ItemsSource.

任何帮助将不胜感激。

谢谢。

推荐答案

DataGridComboBoxColumn 完全可以满足您的需求。要正确使用它，您需要了解以下属性：

The DataGridComboBoxColumn does exactly what you're looking for. To use it correctly, you need to understand the following properties:

• SelectedValueBinding -这是对对象/视图模型上属性的绑定


• SelectedValuePath -这是<$内部项目的value属性c $ c> ComboBox 。当用户从 ComboBox 中选择一个项目时，它将分配给您在 SelectedValueBinding 中设置的属性。


• DisplayMemberPath -这是 ComboBox
  

• SelectedValueBinding - this is the binding to the property on your object/viewmodel
• SelectedValuePath - this is the value property on the items inside the ComboBox. This will be assigned to the property you set in SelectedValueBinding when the user selects an item from the ComboBox.
• DisplayMemberPath - this is the description property on the items inside the ComboBox

设置 DataGridComboBoxColumn ItemsSource c>有点不同；请注意下面的示例以了解其操作方法。

Setting the ItemsSource of the DataGridComboBoxColumn is a little different; note my example below to see how it is done.

这些与您相同（除了 SelectedValueBinding ）在标准的 ComboBox 中。

These are the same (except for SelectedValueBinding) as you have on a standard ComboBox.

以下是您的列的示例。

<DataGridComboBoxColumn Header="Product Type" DisplayMemberPath="ProductType" SelectedValuePath="ProductTypeId" SelectedValueBinding="{Binding ProductTypeId, UpdateSourceTrigger=PropertyChanged}">
    <DataGridComboBoxColumn.ElementStyle>
        <Style TargetType="{x:Type ComboBox}">
            <Setter Property="ItemsSource" Value="{Binding AvailableProductTypes}"/>
            <Setter Property="VerticalAlignment" Value="Center"/>
        </Style>
    </DataGridComboBoxColumn.ElementStyle>
    <DataGridComboBoxColumn.EditingElementStyle>
        <Style TargetType="{x:Type ComboBox}">
            <Setter Property="ItemsSource" Value="{Binding AvailableProductTypes}"/>
            <Setter Property="VerticalAlignment" Value="Center"/>
        </Style>
    </DataGridComboBoxColumn.EditingElementStyle>
</DataGridComboBoxColumn>

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