- ABP Framework version: v7.1.0-rc.2
- UI type: MauiBlazor
- DB provider: EF Core
- Tiered: yes
- Exception message and stack trace:
Volo.Abp.AbpInitializationException: "An error occurred during the initialize Volo.Abp.Modularity.OnApplicationInitializationModuleLifecycleContributor phase of the module Volo.Abp.AspNetCore.Components.MauiBlazor.AbpAspNetCoreComponentsMauiBlazorModule, Volo.Abp.AspNetCore.Components.MauiBlazor, Version=7.0.2.0, Culture=neutral, PublicKeyToken=null: An error occurred during the ABP remote HTTP request. (Es konnte keine Verbindung hergestellt werden, da der Zielcomputer die Verbindung verweigerte. (localhost:44300)) See the inner exception for details.. See the inner exception for details."Stacktrace: bei Volo.Abp.Modularity.ModuleManager.InitializeModules(ApplicationInitializationContext context) bei Volo.Abp.AbpApplicationBase.InitializeModules() bei Volo.Abp.AbpApplicationWithExternalServiceProvider.Initialize(IServiceProvider serviceProvider) bei xxx.MauiBlazor.App.InitializeAbpApplication(IAbpApplicationWithExternalServiceProvider abpApplication, IServiceProvider serviceProvider) in D:\DEV\src\xxxxx.MauiBlazor\App.xaml.cs: Zeile21
InnerException Source Volo.Abp.Http.Client
- Steps to reproduce the issue:"
I created a new application with the cli version 7.1.0-rc.2 and did not make any changes. abp new DemoApp -t app-pro -u maui-blazor --separate-auth-server --with-public-website --no-random-port
After running DbMigrator, the AuthServer, HttpApi.Host and MauiBlazor were started. The MauiBlazor application started but an exception occurs in App.xaml.cs => InitializeAbpApplication.
v7.1.0-rc.2 App.xaml.cs
public App(
IAbpApplicationWithExternalServiceProvider abpApplication,
IServiceProvider serviceProvider)
{
InitializeComponent();
InitializeAbpApplication(abpApplication, serviceProvider);
}
private void InitializeAbpApplication(IAbpApplicationWithExternalServiceProvider abpApplication, IServiceProvider serviceProvider)
{
try
{
abpApplication.Initialize(serviceProvider);
MainPage = new MainPage();
}
catch (AbpInitializationException ex)
{
#if DEBUG
MainPage = GetErrorPage(ex.Message);
#else
MainPage = GetErrorPage("Application couldn't be initialized.");
#endif
}
}
v7.0.2 App.xaml.cs
public App()
{
InitializeComponent();
MainPage = new MainPage();
}
In the template of Version 7.0.1 there was no start problem, the Source of MauiProgram.cs includes this additional lines:
public static MauiApp CreateMauiApp()
{
// snip
var app = builder.Build();
app.Services.GetRequiredService<IAbpApplicationWithExternalServiceProvider>().Initialize(app.Services);
return app;
}
8 Answer(s)
-
0
A connection could not be established because the target computer refused the connectionHi,
Did you start the backend (Authserver & HttpAPI.Host)?
-
0
Hi, yes i did.
-
1
@liangshiwei meanwhile I have made the following changes: Reverted following code from template version 7.0.1, this works so far.
For what reason the template was changed?
App.xaml.cs ctor without calling InitializeAbpApplication
public App( IAbpApplicationWithExternalServiceProvider abpApplication, IServiceProvider serviceProvider) { InitializeComponent(); // JU Workaround // InitializeAbpApplication(abpApplication, serviceProvider); MainPage = new MainPage(); }MauiProgram.cs
public static MauiApp CreateMauiApp() { // snip // JU Workaround // return builder.Build(); var app = builder.Build(); app.Services.GetRequiredService<IAbpApplicationWithExternalServiceProvider>().Initialize(app.Services); return app; } -
0
Hi,
If an exception occurs in the remote service:
Old way The application won't start and you can't see the exception
New way The application will startup and you can see the exception.
It seems a problem, we will check it.
-
0
Hi,
We will revert this change and try to find a better way.
-
0
Maybe this can help:
private async Task<bool> IsRemoteServiceUp(IAbpApplicationWithExternalServiceProvider abpApplication) { var configuration = abpApplication.Services.GetConfiguration(); var remoteServiceUri = configuration["RemoteServices:Default:BaseUrl"]; if (remoteServiceUri == null) { return false; } var ping = new System.Net.NetworkInformation.Ping(); var host = new Uri(remoteServiceUri).Host; var reply = await ping.SendPingAsync(host); return reply.Status == System.Net.NetworkInformation.IPStatus.Success; } -
0
Thanks, we will consider this.
-
0
Sorry for posting this Ping Example it didnt work because it only works with the host without the ports. I am seeing two ways: 1.) with new System.Net.Sockets.TcpClient(); 2 ) with AddHttpClient and using Polly with AddTransientHttpErrorPolicy and AddPolicyHandler
