Question

如何在wpf datagrid中将单个ItemsSource设置为基于某些条件的组合框

xaml代码

  <DataGrid HorizontalAlignment="Left" AutoGenerateColumns="False" ItemsSource="{Binding Items}" Margin="67,70,0,0" VerticalAlignment="Top" Height="170" Width="388">
        <DataGrid.Columns>
        <DataGridTemplateColumn Header="Raw Materials" Width="*">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <TextBlock VerticalAlignment="Center" Text="{Binding Path=SelectedRawMaterials.Display}"/>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
            <DataGridTemplateColumn.CellEditingTemplate>
                <DataTemplate>
                    <ComboBox DisplayMemberPath="Display" SelectedItem="{Binding Path=SelectedRawMaterials}" SelectedValuePath="Value" ItemsSource="{Binding RMColloction}"/>
                </DataTemplate>
            </DataGridTemplateColumn.CellEditingTemplate>
        </DataGridTemplateColumn>
        <DataGridTemplateColumn Header="Raw Materials" Width="*">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <TextBlock VerticalAlignment="Center" Text="{Binding Path=SelectedSize.Display}"/>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
            <DataGridTemplateColumn.CellEditingTemplate>
                <DataTemplate>
                    <ComboBox DisplayMemberPath="Display" SelectedItem="{Binding Path=SelectedSize}" SelectedValuePath="Value" ItemsSource="{Binding SizeColloction}"/>
                </DataTemplate>
            </DataGridTemplateColumn.CellEditingTemplate>
        </DataGridTemplateColumn>
            </DataGrid.Columns>
    </DataGrid>

</Grid>

MVVM模型

   public class RawMaterials
{
    public int Value { get; set; }
    public string Display { get; set; }
}

public class Size
{
    public int RMId { get; set; }
    public int Value { get; set; }
    public string Display { get; set; }
}

public class Item
{
    public Item()
    {
        RMColloction = new List<RawMaterials>();
        RMColloction.Add(new RawMaterials() { Display = "RM1", Value = 1 });
        RMColloction.Add(new RawMaterials() { Display = "RM2", Value = 2 });
        RMColloction.Add(new RawMaterials() { Display = "RM3", Value = 3 });
        RMColloction.Add(new RawMaterials() { Display = "RM4", Value = 4 });
        RMColloction.Add(new RawMaterials() { Display = "RM5", Value = 5 });
        RMColloction.Add(new RawMaterials() { Display = "RM6", Value = 6 });
        SizeColloction = new List<Size>();
        SizeColloction.Add(new Size() { Display = "A", Value = 1, RMId = 1 });
        SizeColloction.Add(new Size() { Display = "B", Value = 2, RMId = 2 });
        SizeColloction.Add(new Size() { Display = "C", Value = 3, RMId = 2 });
        SizeColloction.Add(new Size() { Display = "D", Value = 4, RMId = 1 });
        SizeColloction.Add(new Size() { Display = "E", Value = 5, RMId = 2 });
        SizeColloction.Add(new Size() { Display = "F", Value = 6, RMId = 1 });
    }
    public List<RawMaterials> RMColloction { get; set; }
    public List<Size> SizeColloction { get; set; }

    public RawMaterials SelectedRawMaterials { get; set; }
    public Size SelectedSize { get; set; }
}

视图模型

 public class ViewModel
{
    public ViewModel()
    {
        Items = new ObservableCollection<Item>();
    }

    public ObservableCollection<Item> Items { get; set; }

}

这里我需要基于RawMaterialsColloction RMId的SizeColloction ComboBox填充。是否可以根据具有相同参考的第一个组合选择值获得第二个组合项目？

Answer 1

您需要使用ICollectionView。请参阅下面的代码。

<DataGrid HorizontalAlignment="Left" AutoGenerateColumns="False" ItemsSource="{Binding Items}" Margin="67,70,0,0" VerticalAlignment="Top" Height="170" Width="388">
        <DataGrid.Columns>
            <DataGridTemplateColumn Header="Raw Materials" Width="*" >
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <TextBlock VerticalAlignment="Center" Text="{Binding Path=SelectedRawMaterials.Display,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"/>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
                <DataGridTemplateColumn.CellEditingTemplate>
                    <DataTemplate>
                        <ComboBox DisplayMemberPath="Display" SelectedItem="{Binding Path=SelectedRawMaterials,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" SelectedValuePath="Value" ItemsSource="{Binding RMColloction}"/>
                    </DataTemplate>
                </DataGridTemplateColumn.CellEditingTemplate>
            </DataGridTemplateColumn>
            <DataGridTemplateColumn Header="Raw Materials" Width="*">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <TextBlock VerticalAlignment="Center" Text="{Binding Path=SelectedSize.Display}"/>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
                <DataGridTemplateColumn.CellEditingTemplate>
                    <DataTemplate>
                        <ComboBox DisplayMemberPath="Display" SelectedItem="{Binding Path=SelectedSize}" SelectedValuePath="Value" ItemsSource="{Binding SizeFiltered}"/>
                    </DataTemplate>
                </DataGridTemplateColumn.CellEditingTemplate>
            </DataGridTemplateColumn>
        </DataGrid.Columns>
    </DataGrid>

 public class Item:INotifyPropertyChanged
{
    public ICollectionView SizeFiltered { get; set; }
    public Item()
    {
        RMColloction = new ObservableCollection<RawMaterials>();
        RMColloction.Add(new RawMaterials() { Display = "RM1", Value = 1 });
        RMColloction.Add(new RawMaterials() { Display = "RM2", Value = 2 });
        RMColloction.Add(new RawMaterials() { Display = "RM3", Value = 3 });
        RMColloction.Add(new RawMaterials() { Display = "RM4", Value = 4 });
        RMColloction.Add(new RawMaterials() { Display = "RM5", Value = 5 });
        RMColloction.Add(new RawMaterials() { Display = "RM6", Value = 6 });
        SizeColloction = new ObservableCollection<Size>();
        SizeColloction.Add(new Size() { Display = "A", Value = 1, RMId = 1 });
        SizeColloction.Add(new Size() { Display = "B", Value = 2, RMId = 2 });
        SizeColloction.Add(new Size() { Display = "C", Value = 3, RMId = 2 });
        SizeColloction.Add(new Size() { Display = "D", Value = 4, RMId = 1 });
        SizeColloction.Add(new Size() { Display = "E", Value = 5, RMId = 2 });
        SizeColloction.Add(new Size() { Display = "F", Value = 6, RMId = 1 });

        SizeFiltered = new CollectionViewSource { Source = SizeColloction }.View;
        SizeFiltered.Filter = RmFilter;
    }

    private bool RmFilter(object item)
    {
        bool filter=false;
        if (SelectedRawMaterials != null)
        {
            if ((((Size)item).RMId == SelectedRawMaterials.Value))
                filter= true;
            else
                filter= false;
        }
        return filter;
    }
    public ObservableCollection<RawMaterials> RMColloction { get; set; }
    public ObservableCollection<Size> SizeColloction { get; set; }       

    private RawMaterials selectedRawMaterials;

    public RawMaterials SelectedRawMaterials
    {
        get { return selectedRawMaterials; }
        set 
        { 
            selectedRawMaterials = value;
            OnPropertyChanged("SelectedRawMaterials");
            SizeFiltered.Refresh();
        }
    }   

    public Size SelectedSize { get; set; }

    public event PropertyChangedEventHandler PropertyChanged;
    private void OnPropertyChanged(string propName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propName));
        }
    }
}

Single ItemsSource绑定数据网格组合框

1 个答案: