36

InitializeComponent嗨,我的页面出现错误,我app.xaml.cs检查了网络和所有内容,但没有解决方案有效。请帮忙。

初始化组件不存在

C# 文件:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using Newtonsoft.Json;

namespace Miser_sApp
{
     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 PhoneApplicationFrame RootFrame { get; private set; }

         /// <summary> 
         /// Constructor for the Application object.
         /// </summary>
        public App()
         {
             // Global handler for uncaught exceptions. 
              UnhandledException += Application_UnhandledException;

             // Standard Silverlight initialization
             InitializeComponent();

             // Phone-specific initialization
            InitializePhoneApplication();

            // Show graphics profiling information while debugging.
            if (System.Diagnostics.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;

                // Disable the application idle detection by setting the UserIdleDetectionMode property of the
                // application's PhoneApplicationService object to Disabled.
                 // 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 (System.Diagnostics.Debugger.IsAttached)
            {
                // A navigation has failed; break into the debugger
                System.Diagnostics.Debugger.Break();
            }
        }

        // Code to execute on Unhandled Exceptions
        private void Application_UnhandledException(object sender,    ApplicationUnhandledExceptionEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // An unhandled exception has occurred; break into the debugger
                System.Diagnostics.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;

            // 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;
        }

        #endregion
    }
}

XAML 文件:

<Application 
    x:Class="Miser_sApp.App"
    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">

    <!--Application Resources-->
    <Application.Resources>
    </Application.Resources>

    <Application.ApplicationLifetimeObjects>
        <!--Required object that handles lifetime events for the application-->
        <shell:PhoneApplicationService 
            Launching="Application_Launching" Closing="Application_Closing" 
            Activated="Application_Activated" Deactivated="Application_Deactivated"/>
    </Application.ApplicationLifetimeObjects>

</Application>

我已经上传了app.xaml内容。我没有对其进行任何更改。

4

10 回答 10

133

这有两个潜在的原因

  1. 最常见的是x:Class与 MainPage.xaml 命名空间不匹配。确保 MainPage.xaml 中的 x:Class 具有正确的命名空间。

  2. 此问题的第二个最常见原因是 MainPage.xaml 的“构建操作”未设置为“页面”!

于 2013-11-09T08:09:57.763 回答
14

这是相同的问题和答案: 当前上下文中不存在名称“InitializeComponent”

当您从另一个项目导入一个类,或者更改 xaml 文件的路径,或者 xaml 或后面的 .cs 文件的命名空间时,您可能会收到此错误。

一:它的命名空间可能与您在新项目中的命名空间不同

namespace TrainerB.MVC.Forms
{
     public partial class AboutDeveloper : ContentPage
     {
          public AboutDeveloper()
          {
               InitializeComponent();
          }
     }
}

如您所见,导入文件中的名称空间以旧项目名称开头:"TrainerB",但您的新项目可能有不同的名称,因此只需在 .xaml 文件和 .xaml 文件中将其更改为正确的新项目名称后面的 .cs 文件。

二:

将 .xaml 文件的属性更改为:

构建操作:嵌入式资源

自定义工具: MSBuild:UpdateDesignTimeXaml

Xaml 文件属性

Xaml 命名空间更正 01

Xaml 命名空间更正 02

于 2016-05-15T22:12:51.743 回答
4
  1. 确保 App.xaml 的 BuildAction 设置为“ApplicationDefinition”
  2. 删除项目中的“obj”文件夹,重建。
  3. 如果问题仍然存在,请去掉命名空间中的“_”字符。
于 2013-07-26T16:36:49.247 回答
3

我有相同的构建错误,但构建操作已设置为 Page。尝试将 Build Action 设置为 ApplicationDefinition(错误:只能有一个实例),并将其设置回 Page,修复了构建错误。听起来像黑魔法,但它对我有用。

于 2014-08-27T13:52:56.290 回答
1

就我而言,我已将 XAML 页面的构建操作设置为Embedded Resource,将其还原为Page解决问题。

于 2018-06-26T17:56:40.987 回答
0

这是另一种可能性,在用尽上述所有内容(以及散布在互联网上的其他一些内容)之后:确保您的 Startup 对象在您的 Project Properties > Application 选项卡中正确设置为 [Project].App 。

我已经重命名了一些命名空间,并且在进程 VS 的某处将 Startup 对象设置为“(未设置)”。

于 2014-10-22T01:48:54.740 回答
0

1) 在 xaml 文件中,检查主布局的 x:Name。重命名它 2) 编译。它应该抛出错误 3) 返回到 xaml 文件并给出与文件后面的关联代码相同的类名(.cs 文件)还包括命名空间。例如:如果命名空间是“X”并且类名是“Y”,x:Name = “XY” 4) 编译。它应该工作。

于 2016-08-03T09:22:15.477 回答
0

成功构建后,出现错误时,关闭 VS,删除项目中隐藏的 .vs 文件夹(这会清除智能感知)。打开VS,错误消失了。

于 2018-06-24T06:59:08.923 回答
0

我的解决方案是将 Package.appxmanifest 的 Build Action 属性设置为 AppxManifest。:)

于 2015-08-28T19:58:34.803 回答
-1

这对我有用,在出现此错误的页面上尝试Ctrl+ S。当我的视觉工作室崩溃(重新启动)时,错误就出现了。我正在处理的页面(重新启动之前)没有构建失败。这导致我认为没有正确保存。因此,Ctrl+ S。这解决了我的问题。

于 2017-05-28T10:25:42.243 回答