单的ItemsSource绑定数据网格组合框

Question

如何设置单一的ItemsSource基于WPF中DataGrid的一些条件

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

到组合框

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组合框填充。 是否有可能基于第一个组合选择的值获得具有相同参与的第二组合项目？

Answer 1

您需要使用ICollectionView。请参阅以下代码。

<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)); 
     } 
    } 
}