我刚刚将手机更新为WP8.1并且我昨天为我的应用创建了一个更新并删除并添加了一些功能，突然一个页面无效并抛出System.Reflection.TargetInvocationException。
App.xaml.cs：
using System;
using System.Diagnostics;
using System.Resources;
using System.Windows;
using System.Windows.Markup;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using Knowledge_Organizer.Resources;
namespace Knowledge_Organizer
{
public partial class App : Application
{
/// <summary>
/// Provides easy access to the root frame of the Phone Application.
/// </summary>
/// <returns>The root frame of the Phone Application.</returns>
public static PhoneApplicationFrame RootFrame { get; private set; }
/// <summary>
/// Constructor for the Application object.
/// </summary>
public App()
{
// Global handler for uncaught exceptions.
UnhandledException += Application_UnhandledException;
// Standard XAML initialization
InitializeComponent();
// Phone-specific initialization
InitializePhoneApplication();
// Language display initialization
InitializeLanguage();
// Show graphics profiling information while debugging.
if (Debugger.IsAttached)
{
// Display the current frame rate counters.
Application.Current.Host.Settings.EnableFrameRateCounter = true;
// Show the areas of the app that are being redrawn in each frame.
//Application.Current.Host.Settings.EnableRedrawRegions = true;
// Enable non-production analysis visualization mode,
// which shows areas of a page that are handed off to GPU with a colored overlay.
//Application.Current.Host.Settings.EnableCacheVisualization = true;
// Prevent the screen from turning off while under the debugger by disabling
// the application's idle detection.
// Caution:- Use this under debug mode only. Application that disables user idle detection will continue to run
// and consume battery power when the user is not using the phone.
PhoneApplicationService.Current.UserIdleDetectionMode = IdleDetectionMode.Disabled;
}
}
// Code to execute when the application is launching (eg, from Start)
// This code will not execute when the application is reactivated
private void Application_Launching(object sender, LaunchingEventArgs e)
{
}
// Code to execute when the application is activated (brought to foreground)
// This code will not execute when the application is first launched
private void Application_Activated(object sender, ActivatedEventArgs e)
{
}
// Code to execute when the application is deactivated (sent to background)
// This code will not execute when the application is closing
private void Application_Deactivated(object sender, DeactivatedEventArgs e)
{
}
// Code to execute when the application is closing (eg, user hit Back)
// This code will not execute when the application is deactivated
private void Application_Closing(object sender, ClosingEventArgs e)
{
}
// Code to execute if a navigation fails
private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
{
if (Debugger.IsAttached)
{
// A navigation has failed; break into the debugger
Debugger.Break();
}
}
// Code to execute on Unhandled Exceptions
private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
{
if (Debugger.IsAttached)
{
// An unhandled exception has occurred; break into the debugger
Debugger.Break();
}
}
#region Phone application initialization
// Avoid double-initialization
private bool phoneApplicationInitialized = false;
// Do not add any additional code to this method
private void InitializePhoneApplication()
{
if (phoneApplicationInitialized)
return;
// Create the frame but don't set it as RootVisual yet; this allows the splash
// screen to remain active until the application is ready to render.
RootFrame = new PhoneApplicationFrame();
RootFrame.Navigated += CompleteInitializePhoneApplication;
// Handle navigation failures
RootFrame.NavigationFailed += RootFrame_NavigationFailed;
// Handle reset requests for clearing the backstack
RootFrame.Navigated += CheckForResetNavigation;
// Ensure we don't initialize again
phoneApplicationInitialized = true;
}
// Do not add any additional code to this method
private void CompleteInitializePhoneApplication(object sender, NavigationEventArgs e)
{
// Set the root visual to allow the application to render
if (RootVisual != RootFrame)
RootVisual = RootFrame;
// Remove this handler since it is no longer needed
RootFrame.Navigated -= CompleteInitializePhoneApplication;
}
private void CheckForResetNavigation(object sender, NavigationEventArgs e)
{
// If the app has received a 'reset' navigation, then we need to check
// on the next navigation to see if the page stack should be reset
if (e.NavigationMode == NavigationMode.Reset)
RootFrame.Navigated += ClearBackStackAfterReset;
}
private void ClearBackStackAfterReset(object sender, NavigationEventArgs e)
{
// Unregister the event so it doesn't get called again
RootFrame.Navigated -= ClearBackStackAfterReset;
// Only clear the stack for 'new' (forward) and 'refresh' navigations
if (e.NavigationMode != NavigationMode.New && e.NavigationMode != NavigationMode.Refresh)
return;
// For UI consistency, clear the entire page stack
while (RootFrame.RemoveBackEntry() != null)
{
; // do nothing
}
}
#endregion
// Initialize the app's font and flow direction as defined in its localized resource strings.
//
// To ensure that the font of your application is aligned with its supported languages and that the
// FlowDirection for each of those languages follows its traditional direction, ResourceLanguage
// and ResourceFlowDirection should be initialized in each resx file to match these values with that
// file's culture. For example:
//
// AppResources.es-ES.resx
// ResourceLanguage's value should be "es-ES"
// ResourceFlowDirection's value should be "LeftToRight"
//
// AppResources.ar-SA.resx
// ResourceLanguage's value should be "ar-SA"
// ResourceFlowDirection's value should be "RightToLeft"
//
// For more info on localizing Windows Phone apps see http://go.microsoft.com/fwlink/?LinkId=262072.
//
private void InitializeLanguage()
{
try
{
// Set the font to match the display language defined by the
// ResourceLanguage resource string for each supported language.
//
// Fall back to the font of the neutral language if the Display
// language of the phone is not supported.
//
// If a compiler error is hit then ResourceLanguage is missing from
// the resource file.
RootFrame.Language = XmlLanguage.GetLanguage(AppResources.ResourceLanguage);
// Set the FlowDirection of all elements under the root frame based
// on the ResourceFlowDirection resource string for each
// supported language.
//
// If a compiler error is hit then ResourceFlowDirection is missing from
// the resource file.
FlowDirection flow = (FlowDirection)Enum.Parse(typeof(FlowDirection), AppResources.ResourceFlowDirection);
RootFrame.FlowDirection = flow;
}
catch
{
// If an exception is caught here it is most likely due to either
// ResourceLangauge not being correctly set to a supported language
// code or ResourceFlowDirection is set to a value other than LeftToRight
// or RightToLeft.
if (Debugger.IsAttached)
{
Debugger.Break();
}
throw;
}
}
private void ApplicationBarIconButton_Click(object sender, EventArgs e)
{
}
private void ApplicationBarIconButton_Click_1(object sender, EventArgs e)
{
}
}
}
错误：＆gt; Knowledge Organizer.ni.DLL！Knowledge_Organizer.App.RootFrame_NavigationFailed（object sender，System.Windows.Navigation.NavigationFailedEventArgs e）第92行C＃
// Code to execute if a navigation fails
private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
{
if (Debugger.IsAttached)
{
// A navigation has failed; break into the debugger
Debugger.Break();
}
}
答案 0 :(得分：0)
修改
解决方案非常简单 - page.xaml.cs使用1＆amp; 2在初始化appbar而不是0＆amp;时作为参考。 1 - 导致它找不到数字2 AppBarIconButton - 抛出异常。解决方案：
// Initialize these so that we can edit them
deletenotesBtn = ApplicationBar.Buttons[0] as Microsoft.Phone.Shell.ApplicationBarIconButton;
addnoteBtn = ApplicationBar.Buttons[1] as Microsoft.Phone.Shell.ApplicationBarIconButton;