如何从枢轴页面中删除两个透视项目？ [英] How to remove two pivot items from the pivot page?

问题描述

好吧，我的枢轴页面中有四个透视项目。我想以编程方式删除两个数据透视项。



所以，我编码如下，但应用程序中断了。如果我编码删除单个Pivot项目。它运作良好。但不适用于两个枢轴项目。为什么？

Well, I have four pivot items in my pivot page. I wanna remove two pivot items programmatically.

So, I coded like below, But the app breaks. If I coded to remove single Pivot Item. It works well. But not working for two pivot items. Why ?

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);
            if (NavigationContext.QueryString.ContainsKey("Page"))
            {
                var page = NavigationContext.QueryString["Page"];
                switch (page)
                {
                    case "2":
                        pivot.Items.Remove(item3);
                        pivot.Items.Remove(item4);
                        break;
                    case "3":
                        pivot.Items.Remove(item3);
                        pivot.Items.Remove(item4);
                        break;
                }
            }
        }

App break原因：



> * Microsoft.Phone.ni.dll中出现'System.ArgumentException'类型的异常，但未在用户代码中处理*



指向此行pivot.Items。删除（第4项）;
$


XAML代码：

App breaks Reason:

>*An exception of type 'System.ArgumentException' occurred in Microsoft.Phone.ni.dll but was not handled in user code*

points this line pivot.Items.Remove(item4);

XAML Code:

       <phone:Pivot x:Name="pivot">
            
            <!--Pivot item one-->
            <phone:PivotItem Margin="12,20,12,7" Name="item1">
                <Grid/>
            </phone:PivotItem>

            <!--Pivot item two-->
            <phone:PivotItem Margin="12,20,12,7" Name="item2">
                <Grid/>
            </phone:PivotItem>

            <!--Pivot item three-->
            <phone:PivotItem Margin="12,20,12,7" Name="item3">
                <Grid/>
            </phone:PivotItem>


            <!--Pivot item four-->
            <phone:PivotItem Margin="12,20,12,7" Name="item4">
                <Grid/>
            </phone:PivotItem>
        </phone:Pivot>

- Mohamed Thaufeeq A

- Mohamed Thaufeeq A

推荐答案

你好！

我尝试但没有任何例外：

I try it but didn't get any exceptions:

xaml：

<phone:PhoneApplicationPage
    x:Class="PhoneApp1.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True">

    <!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="LayoutRoot" Background="Transparent">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <!--TitlePanel contains the name of the application and page title-->
        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
            <TextBlock Text="MY APPLICATION" Style="{StaticResource PhoneTextNormalStyle}" Margin="12,0"/>
            <TextBlock Text="page name" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
        </StackPanel>
        <!--ContentPanel - place additional content here-->
        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <Grid.RowDefinitions>
                <RowDefinition/>
                <RowDefinition Height="Auto"/>
            </Grid.RowDefinitions>
                <phone:Pivot x:Name="pivot"
                             Height="600" HorizontalAlignment="Stretch">
                    <!--Pivot item one-->
                    <phone:PivotItem Margin="12,20,12,7" Name="item1"
                                     Header="item 1">
                        <TextBlock Text="text 1"/>
                    </phone:PivotItem>
                    <!--Pivot item two-->
                    <phone:PivotItem Margin="12,20,12,7" Name="item2"
                                     Header="item 2">
                        <TextBlock Text="text 2"/>
                    </phone:PivotItem>
                    <!--Pivot item three-->
                    <phone:PivotItem Margin="12,20,12,7" Name="item3"
                                     Header="item 3">
                        <TextBlock Text="text 3"/>
                    </phone:PivotItem>
                    <!--Pivot item four-->
                    <phone:PivotItem Margin="12,20,12,7" Name="item4"
                                     Header="item 4">
                        <TextBlock Text="text 4"/>
                    </phone:PivotItem>
                </phone:Pivot>
                <Button Content="click" Grid.Row="1" Click="Button_Click" Width="200" Height="100"/>
        </Grid>
    </Grid>
</phone:PhoneApplicationPage>

代码背后：

public partial class MainPage : PhoneApplicationPage
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            this.pivot.Items.Remove(this.item2);
            this.pivot.Items.Remove(this.item3);
        }
    }

这篇关于如何从枢轴页面中删除两个透视项目？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！