如何将自引用表绑定到WPF TreeView [英] How to bind Self-referencing table to WPF TreeView

问题描述

从edmx绑定自引用表的最佳解决方案是什么？ /4uNpU.pngalt =在这里输入图像描述>

到WPF TreeView 控件有东西喜欢：

解决方案

我使用这个绑定转换器解决问题：

  public object Convert（object value，Type targetType，object parameter，CultureInfo culture）
 {
 var item = value as MyTable; 
 return item.MyTable1.Where（i => i.parent_id == item.id）; // return children 
} 
  

.xaml：

 < TreeView Name =treeview1ItemsSource ={Binding Converter = {StaticResource HierarchyConverter}}ItemTemplate ={StaticResource ItemTemplate}> 
< TreeView.Resources> 
< local：HierarchyConverter x：Key =HierarchyConverter/> 
< HierarchicalDataTemplate x：Key =ItemTemplateItemsSource ={Binding Converter = {StaticResource HierarchyConverter}}> 
< TextBlock Text ={Binding element_name}/> 
< / HierarchicalDataTemplate> 
< /TreeView.Resources> 
< / TreeView> 
  

.cs：

  treeview1.ItemsSource = db.MyTable.Where（x => x.partnt_id == null）; //没有父元素
  

What is the best solution to bind a self-referncing table from edmx like:

to a WPF TreeView control to have something like:

解决方案

I solve the problem using this Binding Converter:

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var item = value as MyTable;
        return  item.MyTable1.Where(i => i.parent_id== item.id); //return children
    }

.xaml :

<TreeView Name="treeview1" ItemsSource="{Binding Converter={StaticResource HierarchyConverter}}" ItemTemplate="{StaticResource ItemTemplate}" >
      <TreeView.Resources>
            <local:HierarchyConverter x:Key="HierarchyConverter" />
            <HierarchicalDataTemplate x:Key="ItemTemplate" ItemsSource="{Binding Converter={StaticResource HierarchyConverter}}">
                  <TextBlock Text="{Binding element_name}" />
            </HierarchicalDataTemplate>
      </TreeView.Resources>
</TreeView>

.cs :

treeview1.ItemsSource = db.MyTable.Where(x => x.partnt_id== null);//elements that have no parent

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