在XAML中添加事件处理程序时，XamlParseException [英] XamlParseException when adding event handler in XAML

问题描述

在Windows Phone 8的XAML中，将事件处理程序添加到AutoCompleteBox中，遇到麻烦。以前工作过，但是由于我已经移动了它，所以不再。以下是MainPage.xaml的摘录：

 < Grid x：Name =ContentPanelGrid.Row = 1保证金=12,0,12,0> 
<网格边距=0,0,0,407> 
< Grid.RowDefinitions> 
< RowDefinition Height =50/> 
< RowDefinition Height =70/> 
< RowDefinition Height =50/> 
< RowDefinition Height =70/> 
< /Grid.RowDefinitions> 
< Grid.ColumnDefinitions> 
< ColumnDefinition Width =2 */> 
< ColumnDefinition Width =3 */> 
< /Grid.ColumnDefinitions> 
 
< TextBlock Text =开始：FontSize =35/> 
< toolkit：AutoCompleteBox Grid.Row =1x：Name =autoStadtStartItemsSource ={Binding Towns}Text =StadtTap =AutoCompleteBox_ClickLostFocus =AutoCB_Town_Reset/> 
< toolkit：AutoCompleteBox Grid.Row =1Grid.Column =1x：Name =autoBusStopStartItemsSource ={Binding BusStops}Margin =1,0，-1,0 Text =HaltestelleTap =AutoCompleteBox_ClickLostFocus =AutoCB_BusStop_Reset/> 
 
< TextBlock Grid.Row =2Text =Ziel：FontSize =35/> 
< toolkit：AutoCompleteBox Grid.Row =3x：Name =autoStadtZielItemsSource ={Binding Towns}Text =StadtTap =AutoCompleteBox_ClickLostFocus =AutoCB_Town_Reset/> 
< toolkit：AutoCompleteBox Grid.Row =3Grid.Column =1x：Name =autoBusStopZielItemsSource ={Binding BusStops}Margin =1,0，-1,0 Text =HaltestelleTap =AutoCompleteBox_ClickLostFocus =AutoCB_BusStop_Reset/> 
 
< / Grid> 
< / Grid> 
  

...这是MainPage.xaml.cs中的相应代码：

  private void AutoCompleteBox_Click（AutoCompleteBox sender，System.Windows.Input.GestureEventArgs e）
 {
 sender.Text = ; 
} 
 
 private void AutoCB_BusStop_Reset（AutoCompleteBox sender，System.Windows.Input.GestureEventArgs e）
 {
 if（sender.Text.Equals（）） 
 sender.Text =Haltestelle; 
} 
 
 private void AutoCB_Town_Reset（AutoCompleteBox sender，System.Windows.Input.GestureEventArgs e）
 {
 if（sender.Text.Equals（）） 
 sender.Text =Stadt; 
} 
  

当我删除Tap =...和LostFocus... 从AutoCompleteBox控件，异常不会抛出。有没有人知道发生了什么？

解决方案

你的方法的签名是错误的。它应该是：

  private void AutoCompleteBox_Click（object sender，System.Windows.Input.GestureEventArgs e）
 
 private void AutoCB_BusStop_Reset（object sender，System.Windows.RoutedEventArgs e）
 
 private void AutoCB_Town_Reset（object sender，System.Windows.RoutedEventArgs e）
  / pre> 
I am having trouble adding event handlers to an AutoCompleteBox in XAML for windows phone 8. It worked before, but since I moved things around it doesn't anymore. The following is an extract from my MainPage.xaml:
    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
        <Grid Margin="0,0,0,407">
            <Grid.RowDefinitions>
                <RowDefinition Height="50"/>
                <RowDefinition Height="70"/>
                <RowDefinition Height="50"/>
                <RowDefinition Height="70"/>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="2*"/>
                <ColumnDefinition Width="3*"/>
            </Grid.ColumnDefinitions>

            <TextBlock Text="Start:" FontSize="35"/>
            <toolkit:AutoCompleteBox Grid.Row="1" x:Name="autoStadtStart" ItemsSource="{Binding Towns}" Text="Stadt" Tap="AutoCompleteBox_Click" LostFocus="AutoCB_Town_Reset"/>
            <toolkit:AutoCompleteBox Grid.Row="1" Grid.Column="1" x:Name="autoBusStopStart" ItemsSource="{Binding BusStops}" Margin="1,0,-1,0" Text="Haltestelle" Tap="AutoCompleteBox_Click" LostFocus="AutoCB_BusStop_Reset"/>

            <TextBlock Grid.Row="2" Text="Ziel:" FontSize="35"/>
            <toolkit:AutoCompleteBox Grid.Row="3" x:Name="autoStadtZiel" ItemsSource="{Binding Towns}" Text="Stadt" Tap="AutoCompleteBox_Click" LostFocus="AutoCB_Town_Reset"/>
            <toolkit:AutoCompleteBox Grid.Row="3" Grid.Column="1" x:Name="autoBusStopZiel" ItemsSource="{Binding BusStops}" Margin="1,0,-1,0" Text="Haltestelle" Tap="AutoCompleteBox_Click" LostFocus="AutoCB_BusStop_Reset"/>

        </Grid>
    </Grid>
... and this is the corresponding code in MainPage.xaml.cs:
    private void AutoCompleteBox_Click(AutoCompleteBox sender, System.Windows.Input.GestureEventArgs e)
    {
        sender.Text = "";
    }

    private void AutoCB_BusStop_Reset(AutoCompleteBox sender, System.Windows.Input.GestureEventArgs e)
    {
        if (sender.Text.Equals(""))
            sender.Text = "Haltestelle";
    }

    private void AutoCB_Town_Reset(AutoCompleteBox sender, System.Windows.Input.GestureEventArgs e)
    {
        if (sender.Text.Equals(""))
            sender.Text = "Stadt";
    }
When I remove Tap="..." and LostFocus"..." from the AutoCompleteBox controls, the exception is not thrown. Does anyone have an idea what is going on?
解决方案
The signatures of your methods are wrong. It should be:
private void AutoCompleteBox_Click(object sender, System.Windows.Input.GestureEventArgs e) 

private void AutoCB_BusStop_Reset(object sender, System.Windows.RoutedEventArgs e)

private void AutoCB_Town_Reset(object sender, System.Windows.RoutedEventArgs e)


                        
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