在基类中处理ButtonClick

Question

有一个小问题我不明白。我有一个BasePage (PhoneApplicationPage类型)，在这里我想处理所有的ButtonClicks。

我的BasePage类没有什么特别之处，它只是实现了一个Button_Click处理程序：

using Microsoft.Phone.Controls;
using System.Windows;

namespace TestProject
{
    public partial class BasePage : PhoneApplicationPage
    {
        protected void Button_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("Button clicked");
        }
    }
}

实际页面如下所示：

using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using TestProject.Resources;

namespace TestProject
{
    public partial class MainPage : BasePage
    {
        public MainPage()
        {
            InitializeComponent();
        }
    }
}

..。在xaml中，我创建了一个应该由BasePage类处理的按钮：

<local:BasePage
    x:Class="TestProject.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"
    xmlns:local="clr-namespace:TestProject"
    mc:Ignorable="d"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True">

    <Grid x:Name="LayoutRoot" Background="Transparent">

        <Button
            HorizontalAlignment="Center"
            VerticalAlignment="Center"
            Content="Button"
            Click="Button_Click"/>

    </Grid>

</local:BasePage>

如果我试图运行应用程序，我总是会得到一个异常：

A first chance exception of type 'System.Windows.Markup.XamlParseException' occurred in System.Windows.ni.dll
An exception of type 'System.Windows.Markup.XamlParseException' occurred in System.Windows.ni.dll but was not handled in user code
An exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.ni.dll and wasn't handled before a managed/native boundary
An exception of type 'System.Reflection.TargetInvocationException' occurred in Microsoft.Phone.ni.dll and wasn't handled before a managed/native boundary
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Windows.Markup.XamlParseException: Failed to assign to property 'System.Windows.Controls.Primitives.ButtonBase.Click'. [Line: 23 Position: 19]
   at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
   at TestProject.MainPage.InitializeComponent()
   at TestProject.MainPage..ctor()
   --- End of inner exception stack trace ---
   at System.Windows.Navigation.PageResourceContentLoader.EndLoad(IAsyncResult asyncResult)
   at System.Windows.Navigation.NavigationService.ContentLoader_BeginLoad_Callback(IAsyncResult result)
An exception of type 'System.Reflection.TargetInvocationException' occurred in Microsoft.Phone.ni.dll and wasn't handled before a managed/native boundary
An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in System.Windows.ni.dll

如果我将Button_Click的实现也添加到MainPage中，那么一切都可以找到：

    new protected void Button_Click(object sender, RoutedEventArgs e)
    {
        base.Button_Click(sender, e);
    }

可以向我解释如何只在BasePage类中处理Button_Click (有可能吗？)或者我做错了什么？

(预先表示感谢;)

Answer 1

尝试更改Button_Click的访问级别。

尝尝这个

public partial class BasePage : PhoneApplicationPage
{
    public void Button_Click(object sender, RoutedEventArgs e)
    {
        MessageBox.Show("Button clicked");
    }
}


 new public void Button_Click(object sender, RoutedEventArgs e)
 {
    base.Button_Click(sender, e);
 }