将多个列表绑定到特定的 datagridcombobox 列

Question

我有一个包含 2 列的数据网格 一个是 DataGridText 第二个是 DataGridComboBox 当我加载数据时，两列都被归档，但是当我点击第二个时，我想要一个组合框来加载第二个列表中的数据 所以列表是这样的

public ObservableCollection PriorityRuleList { get;放; } = 新的 ObservableCollection();

public ObservableCollection<int> RulePriorityDefaultList { get; set; } = new ObservableCollection<int>() { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 };

PriorityRule 类是这样的：

public class PriorityRule
{
    public PriorityRule(RecipientSource recipientSource)
    {
        RuleType = recipientSource.Name;
        Priority = recipientSource.Priority;
    }
    public PriorityRule() { }
    public string RuleType { get; set; }
    public int Priority { get; set; }
    public RecipientSource RecipientSource { get; set; }

}

.XAML 文件是这样的：

<DataGrid
                    x:Name="PriorityRulesGrid"
                        HorizontalAlignment="Stretch"
                    VerticalAlignment="Top"
                    AutoGenerateColumns="false"
                    CanUserAddRows="False"
                    GridLinesVisibility="All"
                    HorizontalScrollBarVisibility="Auto"
                    IsReadOnly="False"
                    RowHeight="32"
                    VerticalScrollBarVisibility="Auto"
                    HorizontalContentAlignment="Stretch" 
                    ItemsSource="{Binding PriorityRuleList}"
                    ColumnWidth="*" >
                            <DataGrid.Columns>
                                <DataGridTextColumn Header="{texts:VRI Rule type}"  
                                                    Binding="{Binding RuleType}"
                                                    IsReadOnly="True"
                                                    Width="*"/>
                                <DataGridComboBoxColumn Header="{texts:VRI Priority}" 
                                                        Width="*"
                                    SelectedValuePath="Priority"
                                    SelectedValueBinding="{Binding Priority}"
                                    DisplayMemberPath="Priority">

                                    <DataGridComboBoxColumn.ElementStyle>
                                    <Style TargetType="{x:Type ComboBox}">
                                            <Setter Property="ItemsSource" Value="{Binding Path=DataContext.PriorityRuleList, RelativeSource={RelativeSource AncestorType={x:Type Window}}}" />
                                        </Style>
                                </DataGridComboBoxColumn.ElementStyle>
                                <DataGridComboBoxColumn.EditingElementStyle>
                                    <Style TargetType="ComboBox">
                                            <Setter Property="ItemsSource" Value="{Binding Path=DataContext.RulePriorityDefaultList, RelativeSource={RelativeSource AncestorType={x:Type Window}}}" />
                                    </Style>
                                </DataGridComboBoxColumn.EditingElementStyle>
                                    </DataGridComboBoxColumn>
                            </DataGrid.Columns>    
                   </DataGrid>

我的问题是： 单击第二列中的组合框时，我应该如何加载第二个列表。第一个列表在窗口出现时加载，所以没关系，但是我需要从组合框中选择优先级，所以我无法加载第二个列表（int类型）以便从中选择？

谢谢！

Answer 1

看起来您正试图将两种不同类型的源分配给DataGridComboBoxColumn.ItemSource。保持两个来源没问题，但确保属性Priority 存在。否则，SelectedValuePath 和 DisplayMemberPath 的评估将失败。

使用属性Priority 创建一个类 PriorityX

public class PriorityX
        {
            public int Priority { get; set; }

        }

    // assing your default values into this collection
    public ObservableCollection<PriorityX> RulePriorityDefaultList { get; set; } = new ObservableCollection<PriorityX>();

在 XAML 中

<Window.Resources>
    <!--load RulePriorityDefaultList as a static resource-->
    <CollectionViewSource x:Key="RulePriorityDefaultList" Source="{Binding RulePriorityDefaultList}" />
</Window.Resources>

<Grid>
    <DataGrid
                x:Name="PriorityRulesGrid"
                HorizontalAlignment="Stretch"
                VerticalAlignment="Top"
                AutoGenerateColumns="false"
                CanUserAddRows="False"
                GridLinesVisibility="All"
                HorizontalScrollBarVisibility="Auto"
                IsReadOnly="False"
                RowHeight="32"
                VerticalScrollBarVisibility="Auto"
                HorizontalContentAlignment="Stretch"
                ItemsSource="{Binding PriorityRuleList}"
                ColumnWidth="*">
        <DataGrid.Columns>
            <DataGridTextColumn Header="Rule type"
                                                Binding="{Binding RuleType}"
                                                IsReadOnly="True"
                                                Width="*" />
            <DataGridComboBoxColumn Header="Priority"
                               Width="*"
                               SelectedValuePath="Priority"
                               SelectedValueBinding="{Binding Priority}"
                               DisplayMemberPath="Priority"
                               ItemsSource="{Binding Source={StaticResource RulePriorityDefaultList }}">
            </DataGridComboBoxColumn>
        </DataGrid.Columns>
    </DataGrid>
</Grid>

你也可以使用你现有的课程。

//assing your default values into this collection
public ObservableCollection<PriorityRule> RulePriorityDefaultList { get; set; } = new ObservableCollection<PriorityRule>();