在Wpf中獲取祖先源

Question

我想獲取祖先ItemsControl.ItemTemplate源作爲我的DataGrid源，但我無法處理這種情況。我在我的xaml中嘗試了以下情況。但它沒有用，datagrid是空的。

這是我的XAML：

<ItemsControl ItemsSource="{Binding Accounts}"> 
    <ItemsControl.ItemTemplate> 
     <DataTemplate> 
      <Expander ExpandDirection="Down" FlowDirection=" RightToLeft"> 
       <Expander.Header> 
        <DataGrid FlowDirection="LeftToRight" 
          ItemsSource="{RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemTemplate}}}"> 
         <DataGrid.Columns> 
          <DataGridTextColumn Binding="{Binding UserName}" /> 
          <DataGridTextColumn Binding="{Binding Password}" /> 
         </DataGrid.Columns> 
        </DataGrid> 
       </Expander.Header> 
      </Expander> 
     </DataTemplate> 
    </ItemsControl.ItemTemplate> 

帳戶屬性實現像：

public List<User> Accounts = new List<User>(); 
Accounts.Add(new User("userName1","password1")); 
Accounts.Add(new User("userName2","password2")); 

而且我User.cs是這樣的：

public class User : INotifyPropertyChanged 
{ 
     public string UserName{get; set;} 
     public string Password{get; set;} 


     public UserAccount(string userName, string password) 
     { 
      UserName = userName; 
      Password = password; 
     } 
} 

Answer 1

基本上，此代碼不cr eate a binding

ItemsSource="{RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemTemplate}}}" 

也是祖先類型不正確。

嘗試這個綁定：

ItemsSource="{Binding Path=DataContext.Accounts, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}}" 

，或者使用的ElementName：

<ItemsControl Name="LstAccounts" ItemsSource="{Binding Accounts}"> 

和

ItemsSource="{Binding Path=DataContext.Accounts, ElementName=LstAccounts}" 

---

代碼以上修復結合，但產生意想不到的效果。這裏是表示單個對象在數據網格

爲的ItemSource結合我創建了一個轉換器（my own older answer）

public class ItemsSourceConverter: IValueConverter 
{ 
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture) 
    { 
     // doesn't allow to add new rows in DataGrid 
     return Enumerable.Repeat(value, 1).ToArray();    
    } 

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) 
    { 
     throw new NotImplementedException(); 
    } 
} 

和這裏被修改ItemsControl的溶液。轉換器存儲在資源中並用於ItemsSource綁定。 DataGrid中自動生成的實例列

<ItemsControl ItemsSource="{Binding Accounts}"> 
    <ItemsControl.Resources> 
     <local:ItemsSourceConverter x:Key="Enumerator"/> 
    </ItemsControl.Resources> 
    <ItemsControl.ItemTemplate> 
     <DataTemplate> 
      <Expander ExpandDirection="Down" FlowDirection=" RightToLeft"> 
       <Expander.Header> 
        <DataGrid FlowDirection="LeftToRight" 
           ItemsSource="{Binding ., Converter={StaticResource Enumerator}}"/> 
       </Expander.Header> 
      </Expander> 
     </DataTemplate> 
    </ItemsControl.ItemTemplate> 
</ItemsControl> 

這裏是截圖