C# 函数不'；除了第一次（WP8），我叫它时它不工作
我的应用程序需要解析一个JSON文件才能从网上获取信息。 当我加载应用程序时，它可以正常工作，但当我单击“刷新”按钮时，它不能正常工作。 有人能看一下代码（C#）看看我做错了什么吗 ==MainPage.xaml==C# 函数不'；除了第一次（WP8），我叫它时它不工作,c#,xaml,windows-phone-8,C#,Xaml,Windows Phone 8,我的应用程序需要解析一个JSON文件才能从网上获取信息。 当我加载应用程序时，它可以正常工作，但当我单击“刷新”按钮时，它不能正常工作。 有人能看一下代码（C#）看看我做错了什么吗 ==MainPage.xaml== <phone:PhoneApplicationPage x:Class="BitValue.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmln
<phone:PhoneApplicationPage
x:Class="BitValue.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 è la griglia radice in cui viene inserito tutto il contenuto della pagina-->
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!-- NOTA SULLA LOCALIZZAZIONE:
Per localizzare le stringhe visualizzate copiarne i valori in chiavi denominate in modo appropriato
nel file di risorse della lingua neutra dell'applicazione (AppResources.resx) quindi
sostituire il valore del testo hard-coded tra le virgolette degli attributi
con la clausola di binding il cui percorso punta a quel nome di stringa.
Ad esempio:
Text="{Binding Path=LocalizedResources.ApplicationTitle, Source={StaticResource LocalizedStrings}}"
Questa associazione punta alla risorsa della stringa del modello denominata "ApplicationTitle".
L'aggiunta delle lingue supportate nella scheda Proprietà progetto crea un
nuovo file RESX per lingua che può trasportare i valori tradotti delle
stringhe IU. L'associazione in questi esempi farà in modo che il valore degli
attributi venga disegnato dal file RESX che corrisponde a
CurrentUICulture dell'applicazione al momento del runtime.
-->
<!--TitlePanel contiene il nome dell'applicazione e il titolo della pagina-->
<StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
<TextBlock Text="BitValue" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
</StackPanel>
<!--ContentPanel - inserire ulteriore contenuto qui-->
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<StackPanel>
<TextBlock HorizontalAlignment="Center">values provided by bitstamp</TextBlock>
<Grid Grid.Column="4" Grid.Row="4" Margin="12,0,12,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*" ></ColumnDefinition>
<ColumnDefinition Width="1*" ></ColumnDefinition>
<ColumnDefinition Width="1*" ></ColumnDefinition>
<ColumnDefinition Width="1*" ></ColumnDefinition>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="1*"></RowDefinition>
<RowDefinition Height="1*"></RowDefinition>
<RowDefinition Height="1*"></RowDefinition>
<RowDefinition Height="1*"></RowDefinition>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Text="LAST" Margin="5,10" Style="{StaticResource PhoneTextExtraLargeStyle}" Foreground="#FFEAB33C"/>
<TextBlock x:Name="valueLast" Grid.Row="0" Margin="5,10" Grid.ColumnSpan="3" Grid.Column="1" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
<TextBlock Grid.Column="0" Grid.Row="1" Text="BID" Margin="5,10" Foreground="#FF2AB437">
</TextBlock>
<TextBlock Grid.Column="2" Grid.Row="1" Text="ASK" Margin="5,10" Foreground="#FFE83131">
</TextBlock>
<TextBlock Grid.Column="0" Grid.Row="2" Text="24H LOW" Foreground="#FFEAB33C" Margin="5,10"></TextBlock>
<TextBlock Grid.Column="2" Grid.Row="2" Text="24H HIGH" Foreground="#FFEAB33C" Margin="5,10"></TextBlock>
<TextBlock x:Name="ValueBid" Grid.Column="1" Grid.Row="1" Margin="5,10"></TextBlock>
<TextBlock x:Name="ValueAsk" Grid.Column="3" Grid.Row="1" Margin="5,10"></TextBlock>
<TextBlock x:Name="ValueLow" Grid.Column="1" Grid.Row="2" Margin="5,10"></TextBlock>
<TextBlock x:Name="ValueHigh" Grid.Column="3" Grid.Row="2" Margin="5,10"></TextBlock>
</Grid>
</StackPanel>
</Grid>
<!--Rimuovere il commento per vedere la griglia di allineamento che consenta di verificare che i controlli siano
allineati ai limiti comuni. L'immagine ha un margine superiore di -32px tenendo
conto della barra delle applicazioni. Impostarlo su 0 (o eliminare tutti i margini)
se la barra delle applicazioni è nascosta.
Prima della spedizioni, eliminare questo XAML e l'immagine stessa.-->
<!--<Image Source="/Assets/AlignmentGrid.png" VerticalAlignment="Top" Height="800" Width="480" Margin="0,-32,0,0" Grid.Row="0" Grid.RowSpan="2" IsHitTestVisible="False" />-->
</Grid>
<phone:PhoneApplicationPage.ApplicationBar>
<shell:ApplicationBar IsVisible="True" IsMenuEnabled="True">
<shell:ApplicationBarIconButton IconUri="/Assets/refresh2.png" Text="refresh" Click="refreshClick"/>
<shell:ApplicationBar.MenuItems>
<shell:ApplicationBarMenuItem Text="about"/>
</shell:ApplicationBar.MenuItems>
</shell:ApplicationBar>
</phone:PhoneApplicationPage.ApplicationBar>
</phone:PhoneApplicationPage>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.Serialization;
namespace BitValue
{
[DataContract]
public class Result
{
[DataMember(Name = "last")]
public string LAST
{
get;
set;
}
[DataMember(Name = "ask")]
public string ASK
{
get;
set;
}
[DataMember(Name = "bid")]
public string BID
{
get;
set;
}
[DataMember(Name = "low")]
public string LOW
{
get;
set;
}
[DataMember(Name = "high")]
public string HIGH
{
get;
set;
}
[DataMember(Name = "timestamp")]
public string TIMESTAMP
{
get;
set;
}
}
}
提前感谢。问题是您的代码实际上看起来。好吧问题在API中，您将得到一个缓存结果（因此，第二次，缓存由webclient返回）
看看这里：到底发生了什么？工作不是什么意思吗？这是家庭作业吗？正如标题所说，当第一次调用函数refresh（）时（当加载组件时），它工作正常，但当我在refreshClick事件中调用它时（当我单击按钮刷新时），它不工作“不工作”意味着
refresh（）OnOpenReadCompleted（）未调用using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.Serialization;
namespace BitValue
{
[DataContract]
public class Result
{
[DataMember(Name = "last")]
public string LAST
{
get;
set;
}
[DataMember(Name = "ask")]
public string ASK
{
get;
set;
}
[DataMember(Name = "bid")]
public string BID
{
get;
set;
}
[DataMember(Name = "low")]
public string LOW
{
get;
set;
}
[DataMember(Name = "high")]
public string HIGH
{
get;
set;
}
[DataMember(Name = "timestamp")]
public string TIMESTAMP
{
get;
set;
}
}
}