如何将值传递给UserControl（uwp）

Question

如何将值传递给UserControl（uwp）

<Pivot Title="Welcome" Name="View_P" SelectionChanged="Pivot_SelectionChanged" >
    <PivotItem Header="Car" Name="v_1">
        <local:View_Control />
            </PivotItem>

            <PivotItem Header="electronics">
        <local:View_Control/>
    </PivotItem>
</Pivot>

请参见PivotItem0和PivotItem0

<local:View_Control/>

下一个代码C＃

private void Pivot_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if( View_P.SelectedIndex == 0)
    {
        View_Control.numbers=1
    }
    else if (View_P.SelectedIndex == 0)
    {
        View_Control.numbers = 2
    }
}

下一个代码UserControl名称页面（View_Control）

public  int numbers;
public View_Control()
{
    ServiceErkaanClient dv = new ServiceErkaanClient();
    this.InitializeComponent();
    MyGrid1.ItemsSource = dv.SP_All_SellAsync(numbers).Result;
}

必需如果单击Pivot SelectedIndex == 0，则会向UserControl（View_Control）1发送参数并刷新

Answer 1

首先，您应该将名称设置为View_Control，然后可以看到以下代码。

<Pivot Title="Welcome" Name="View_P" 
       SelectionChanged="Pivot_SelectionChanged" >
    <PivotItem Header="Car" Name="v_1">
         <local:View_Control Name="v1"/>
    </PivotItem>

    <PivotItem Header="electronics">
        <local:View_Control Name="v2"/>
    </PivotItem>
 </Pivot>

第二个是将字段编号更改为属性，您可以看到以下代码。

    private int _numbers;
    public int Numbers
    {
        set
        {
            _numbers=value;

            //when the numbers be changed

            ServiceErkaanClient dv = new ServiceErkaanClient();
            MyGrid1.ItemsSource = dv.SP_All_SellAsync(numbers).Result;
        }
        get
        {
            return _numbers;
        }
    }
    public View_Control()
    {
        ServiceErkaanClient dv = new ServiceErkaanClient();
        this.InitializeComponent();
        MyGrid1.ItemsSource = dv.SP_All_SellAsync(Numbers).Result;
    }

当您将数字设置为1时，它将调用SP_All_SellAsync。

如果要使用依赖项属性，可以尝试以下代码

  public static readonly DependencyProperty NumbersProperty = DependencyProperty.Register(
        "Numbers", typeof(int), typeof(View_Control), new PropertyMetadata(default(int), (s, e) =>
        {
            View_Control view = (View_Control) s;
            int n = (int) e.NewValue;

            ServiceErkaanClient dv = new ServiceErkaanClient();
            view.MyGrid1.ItemsSource = dv.SP_All_SellAsync(n).Result;
        }));

    public int Numbers
    {
        get { return (int) GetValue(NumbersProperty); }
        set { SetValue(NumbersProperty, value); }
    }

    public View_Control()
    {
        ServiceErkaanClient dv = new ServiceErkaanClient();
        this.InitializeComponent();
        MyGrid1.ItemsSource = dv.SP_All_SellAsync(Numbers).Result;
    }

如有任何疑问，欢迎与我联系。