wpf datagrid自动扩展第一组 [英] wpf datagrid automatically expand first group

问题描述

我有一个datagrid，其中itemsource绑定到一个ListCollectionView与一个组。
当我填写这个集合时，我希望第一个组自动地被视为扩展，如何在wpf（codebehind或mvvm）中编码？

 
 ItemsSource ={Binding ResultColl}
 SelectedItem ={Binding Path = SelectedResultItem，Mode = TwoWay}
 SelectionMode =SingleIsReadOnly = True> 
< DataGrid.GroupStyle> 
< GroupStyle> 
< GroupStyle.ContainerStyle> 
< Style TargetType ={x：Type GroupItem}> 
< Setter Property =Template> 
< Setter.Value> 
< ControlTemplate TargetType ={x：Type GroupItem}> 
< Expander> 
< Expander.Header> 
< StackPanel> 
< TextBox Text ={Binding Items [0] .ID}/> 
< / StackPanel> 
< /Expander.Header> 
< ItemsPresenter /> 
< / Expander> 
< / ControlTemplate> 
< /Setter.Value> 
< / Setter> 
< / Style> 
< /GroupStyle.ContainerStyle> 
< / GroupStyle> 
< /DataGrid.GroupStyle> 
 
< DataGrid.Columns> 
< DataGridTextColumn Binding ={Binding Path = ID}/> 
< DataGridTextColumn Binding ={Binding Path = Typ}/> 
< DataGridTextColumn Binding ={Binding Path = Info}/> 
< DataGridTextColumn Binding ={Binding Path = orderDate，StringFormat = {} {0：dd-MM-yyyy}}/> 
< /DataGrid.Columns> 
< / DataGrid> 
  

在mvvm控制器中：

  ListCollectionView tmp = new ListCollectionView（myList）; 
 tmp.GroupDescriptions.Add（new PropertyGroupDescription（ID））; 
 ResultColl = tmp; 
 ... 
 ListCollectionView _resultColl; 
 public ListCollectionView ResultColl 
 {
 get {return _resultColl; } 
 set {_resultColl = value; 
 
 RaisePropertyChanged（ResultColl）; 
 if（value！= null&& _resultColl.Count> 0）
 SelectedResultItem = _resultColl.GetItemAt（0）as ItemResult; 
} 
} 
  

执行代码时，数据网格填充第1

解决方案

将IsExpanded属性添加到您的类中，并将绑定添加到Expander：

 < Expander IsExpanded ={Binding Items [0] .IsExpanded}> 
  

设置IsExpanded为第一个为true

I have a datagrid with the itemsource bound to a ListCollectionView with one group. When i fill the collection, i want the first group autmatically viewed as expanded, how to code that in wpf (codebehind or mvvm)?

            <DataGrid 
                 ItemsSource="{Binding ResultColl}" 
                 SelectedItem="{Binding Path=SelectedResultItem, Mode=TwoWay}"
                 SelectionMode="Single" IsReadOnly="True" >
            <DataGrid.GroupStyle>
                <GroupStyle>
                    <GroupStyle.ContainerStyle>
                        <Style TargetType="{x:Type GroupItem}">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="{x:Type GroupItem}">
                                        <Expander>
                                            <Expander.Header>
                                                <StackPanel>
                                                        <TextBox Text="{Binding Items[0].ID}" />
                                                </StackPanel>
                                            </Expander.Header>
                                            <ItemsPresenter />
                                        </Expander>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </GroupStyle.ContainerStyle>
                </GroupStyle>
            </DataGrid.GroupStyle>

                <DataGrid.Columns>
                    <DataGridTextColumn Binding="{Binding Path=ID}"/>
                    <DataGridTextColumn Binding="{Binding Path=Typ}"/>
                    <DataGridTextColumn Binding="{Binding Path=Info}"/>
                    <DataGridTextColumn Binding="{Binding Path=orderDate, StringFormat={}{0:dd-MM-yyyy}}"/>
                </DataGrid.Columns>
            </DataGrid>

In the mvvm controller:

    ListCollectionView tmp = new ListCollectionView(myList);
    tmp.GroupDescriptions.Add(new PropertyGroupDescription("ID"));
    ResultColl = tmp;
    ...
    ListCollectionView _resultColl;
    public ListCollectionView ResultColl
    {
        get { return _resultColl; }
        set { _resultColl = value;

            RaisePropertyChanged("ResultColl");
            if (value != null && _resultColl.Count > 0)
                SelectedResultItem = _resultColl.GetItemAt(0) as ItemResult;
        }
    }

When executing the code, the datagrid is filled the 1st item is selected but group is collapsed.

解决方案

Add IsExpanded property to your class and add binding to Expander:

<Expander IsExpanded="{Binding Items[0].IsExpanded}">

Set IsExpanded for first to true

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