c# – 如何从WPF中的datagrid获取组合框中的数据？

2024年1月12日 234次阅读

我一直在寻找一种从我创建的数据网格组合框中获取数据的方法.特别是来自列的每个组合框的选定值.我是
WPF的新手,如果有人愿意,我将非常感激.

谢谢

XAML：

<DataGrid x:Name="tb" Margin="5,51,5,5" ItemsSource="{Binding}"         AutoGenerateColumns="False">
        <DataGrid.Columns>
            <DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
            <DataGridCheckBoxColumn Header="Include" Binding="{Binding Include}"/>
            <DataGridTemplateColumn Header="Measure" Width="*">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <ComboBox Margin="2" ItemsSource="{Binding Measure}"/>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
        </DataGrid.Columns>
    </DataGrid>

C#：

ObservableCollection<State> items = new ObservableCollection<State>();
        foreach (string col in columns)
        {
            items.Add(new State()
            {
                Name = col,
                Include = true,
                Measure = new ObservableCollection<string>() { "Sum", "Average" }
            });
        }
        DataContext = items;

列的图片：

最佳答案 我觉得你很困惑.我假设您希望您的State项具有字符串Measure属性,而不是它们的集合,但您希望能够从具有多个选项的Combo中选择Measure值…

如果是这种情况,那么您应该将Measure属性重新定义为单个字符串,而不是集合.

ObservableCollection<State> items = new ObservableCollection<State>();
    foreach (string col in columns)
    {
        items.Add(new State()
        {
            Name = col,
            Include = true,
            Measure = string.Empty  // Initialize it to whatever you want
        });
    }
    DataContext = items;

然后在DataContext中的其他位置创建Measure值集合,或者如果除了集合之外没有DataContext,则可以在XAML中定义它.

最后,在DataGrid中,您必须绑定Combos的ItemsSource和SelectedItem属性.它们将共享相同的ItemsSource,它必须从放置集合的任何位置获取,而不是行的DataContext：

<DataGrid x:Name="tb" Margin="5,51,5,5" ItemsSource="{Binding}"
          AutoGenerateColumns="False">
    <DataGrid.Resources>
        <!-- This is where the values are defined -->
        <col:ArrayList x:Key="MeasureValues">
            <sys:String>Sum</sys:String>
            <sys:String>Average</sys:String>
        </col:ArrayList>
    </DataGrid.Resources>
    <DataGrid.Columns>
        <DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
        <DataGridCheckBoxColumn Header="Include" Binding="{Binding Include}"/>
        <DataGridTemplateColumn Header="Measure" Width="*">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <ComboBox Margin="2"
                              SelectedItem="{Binding Measure}"
                              ItemsSource="{StaticResource MeasureValues}" />
                              <!-- And this is where you consume those values -->
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>

如果你不想把值放在XAML中,你必须在另一个DataContext中定义集合并以某种方式创建一个绑定(使用RelativeSource,ElementName和类似的东西).

当然,这也适用于DataGridComboBoxColumn：

<DataGrid x:Name="tb" Margin="5,51,5,5" ItemsSource="{Binding}"
          AutoGenerateColumns="False">
    <DataGrid.Resources>
        <!-- This is where the values are defined -->
        <col:ArrayList x:Key="MeasureValues">
            <sys:String>Sum</sys:String>
            <sys:String>Average</sys:String>
        </col:ArrayList>
    </DataGrid.Resources>
    <DataGrid.Columns>
        <DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
        <DataGridCheckBoxColumn Header="Include" Binding="{Binding Include}"/>
        <DataGridComboBoxColumn Header="Measure" Width="*"
                                SelectedItemBinding="{Binding Measure}"
                                ItemsSource="{StaticResource MeasureValues}" />
                                <!-- And this is where you consume those values -->
    </DataGrid.Columns>
</DataGrid>
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