如何更改ItemsPanelTemplate WrapGrid从XAML代码？

Question

我想修改我的WrapGrid像这样的MaximumRowsOrColumns属性：

<GridView.ItemsPanel> 
    <ItemsPanelTemplate> 
     <WrapGrid x:Name="wrapGridItems" Orientation="Vertical" MaximumRowsOrColumns="1" /> 
    </ItemsPanelTemplate> 
</GridView.ItemsPanel> 

然后我使用此代码来改变WrapGrid：

<VisualState x:Name="Snapped"> 
    <Storyboard> 
     <ObjectAnimationUsingKeyFrames Storyboard.TargetName="wrapGridItems" Storyboard.TargetProperty="MaximumRowsOrColumns"> 
      <DiscreteObjectKeyFrame KeyTime="0" Value="-1"/> 
     </ObjectAnimationUsingKeyFrames> 
      <ObjectAnimationUsingKeyFrames Storyboard.TargetName="headerText" Storyboard.TargetProperty="Text"> 
      <DiscreteObjectKeyFrame KeyTime="0" Value="Pins"/> 
     </ObjectAnimationUsingKeyFrames> 
    </Storyboard> 
</VisualState> 

但我得到错误

WinRT信息：无法解析TargetName wrapGridItems。

我应该如何引用ObjectAnimationUsingKeyFrames Storyboard.TargetName属性中的WrapGrid？

Answer 1

您无法使用x：Name访问模板内的元素。由于模板可能被实例化很多次，动画将无法分辨它应该操作哪个元素。

如果您需要更改模板中元素的属性，你应该使用绑定：

<GridView.ItemsPanel> 
    <ItemsPanelTemplate> 
     <WrapGrid Orientation="Vertical" MaximumRowsOrColumns="{Binding MyMaxRowsOrCollumns}" /> 
    </ItemsPanelTemplate> 
</GridView.ItemsPanel> 

Answer 2

设计规范：

<GridView > 

<GridView.ItemsPanel> 
          <ItemsPanelTemplate> 
           <WrapGrid x:Name="wrapGrid" Orientation="Vertical" MaximumRowsOrColumns="{Binding MyMaxRowsOrCollumns}"></WrapGrid> 
          </ItemsPanelTemplate> 
         </GridView.ItemsPanel> 
</GridView > 

---

C＃代码：

创建扶养物业

public int MyMaxRowsOrCollumns 
    { 
     get { return (int)GetValue(MyMaxRowsOrCollumnsProperty); } 
     set { SetValue(MyMaxRowsOrCollumnsProperty, value); } 
    } 

    // Using a DependencyProperty as the backing store for MyMaxRowsOrCollumns. This enables animation, styling, binding, etc... 
    public static readonly DependencyProperty MyMaxRowsOrCollumnsProperty = 
     DependencyProperty.Register("MyMaxRowsOrCollumns", typeof(int), typeof(DashBord), new PropertyMetadata(2));