WPF DataGrid 分组与总和和其他字段
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WPF DataGrid Grouping with sums and other fields
提问by Xaphann
I have a DataGrid that is bound to collection and that I want to be grouped. Here is the code
我有一个绑定到集合的 DataGrid，我想对其进行分组。这是代码
Collection:
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private string _ID;
private string _Descript;
private decimal _Amount;
public string ID
{
get { return _ID; }
set { _ID = value; NotifyPropertyChanged("ID"); }
}
public decimal Amount
{
get { return _Amount; }
set { _Amount = value; NotifyPropertyChanged("Amount"); }
}
public string Descript
{
get { return _Descript; }
set { _Descript = value; NotifyPropertyChanged("Descript"); }
}
C#;
C＃;
ListCollectionView groupcollection = new ListCollectionView(myCollection);
groupcollection.GroupDescriptions.Add(new PropertyGroupDescription("ID"));
myDataGrid.ItemsSource = groupcollection;
XAML:
XAML：
<DataGrid Name="myDataGrid">
<DataGrid.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Path=Name}" />
</StackPanel>
</DataTemplate>
</GroupStyle.HeaderTemplate>
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type GroupItem}">
<Expander>
<Expander.Header>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=Name}" Margin="5"/>
<TextBlock Text="Count" Margin="5" />
<TextBlock Text="{Binding Path=ItemCount}" Margin="5"/>
</StackPanel>
</Expander.Header>
<ItemsPresenter />
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
</DataGrid.GroupStyle>
This works perfectly but now in the Expander.HeaderI want to added a summary of a "Amount" and "Descript" value. So for example if there were 3 records in the collection with ID "ABC" each one being 20 and the description for ABC being "My Count" I would want to see;
这非常有效，但现在Expander.Header我想添加“金额”和“描述”值的摘要。因此，例如，如果集合中有 3 条记录，ID 为“ABC”，每条记录为 20，而 ABC 的描述为“My Count”，我希望看到；
ABC My Count total 60
How would I do that?
我该怎么做？
回答by Mal
You could use a converter that's passed the Items property of the group header e.g.
您可以使用传递组标题的 Items 属性的转换器，例如
<Window.Resources>
<local:GroupsToTotalConverter x:Key="groupsConverter" />
</Window.Resources>
<Expander.Header>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=Name}" Margin="5"/>
<TextBlock Text="total" Margin="5" />
<TextBlock Text="{Binding Path=Items, Converter={StaticResource groupsConverter}}" Margin="5" />
</StackPanel>
where the converter performs the calculation and passes back the total as the string for the text block:
其中转换器执行计算并将总数作为文本块的字符串传回：
public class GroupsToTotalConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value is ReadOnlyObservableCollection<Object>)
{
var items = (ReadOnlyObservableCollection<Object>)value;
Decimal total = 0;
foreach (GroupItem gi in items)
{
total += gi.Amount;
}
return total.ToString();
}
return "";
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return value;
}
}
As for the description I'd suggest also grouping by that, and writing another converter to pull out the description from the Items in a similar manner to above.
至于描述，我建议也按此分组，并编写另一个转换器以与上述类似的方式从项目中提取描述。
