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This error is typically caused by a resource path (such as a script, style, or bundle reference) that does not start with a forward slash ("/"). In ABP 9.3.x, the bundling/tag helper system is stricter and requires all resource paths to be absolute (i.e., start with "/").

Solution

1. Check All Resource References in _Host.cshtml
   • Ensure every href or src attribute for scripts, styles, and other resources starts with a /.
   • For example, change:

<link href="content/DevExpress.Blazor.Themes/blazing-berry.bs5.min.css" rel="stylesheet" />

 to:

<link href="/content/DevExpress.Blazor.Themes/blazing-berry.bs5.min.css" rel="stylesheet" />

2. Check ABP Bundling TagHelpers

   • If you use ABP's bundling system (e.g., <abp-script-bundle>, <abp-style-bundle>), make sure the bundle names and file paths are correct and start with /.

3. Review Custom TagHelpers or Resource Injections

   • If you have custom logic that injects scripts/styles, ensure all paths are absolute.

4. Check for Dynamic Path Generation

   • If you generate paths dynamically in C# or Razor, always prefix with /.

5. Restart and Clean Solution

   • After making changes, clean and rebuild your solution to ensure no cached files are causing issues.

Reference

• ABP Support: The path in 'value' must start with '/'. (Parameter 'value')

This should resolve the error in your _Host.cshtml file after upgrading to ABP 9.3.1.

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To ensure that the Angular frontend receives the backend's AbpCookieConsentOptions (such as CookiePolicyUrl and PrivacyPolicyUrl), these options must be exposed via the application configuration API. By default, ABP's GDPR module does not automatically send the backend cookie consent options to the Angular client through /api/abp/application-configuration. This is why you do not see these options in the API response, and the frontend does not bind to them unless you set them manually in provideGdprConfig.

Solution:

1. Manual Synchronization Required:
   Currently, you need to manually keep the backend and frontend cookie consent options in sync. The backend configuration (AbpCookieConsentOptions) is used for the server-side rendering and .NET-based UI, but the Angular module expects its own configuration via provideGdprConfig.

2. How to Synchronize:

   • Set the options in both places:
     • In your backend, configure AbpCookieConsentOptions as you already do.
     • In your Angular app, set the same values in provideGdprConfig.
   • If you want to avoid duplication, you can implement a custom Angular service that fetches the values from a custom API endpoint you expose from your backend, then passes them to provideGdprConfig at runtime.

3. Why This Happens:
   The ABP GDPR module's backend options are not automatically included in the application configuration sent to the Angular client. This is by design, as the Angular module is decoupled and expects explicit configuration.

Summary:
There is no built-in mechanism in ABP 9.0.5 to automatically bind backend AbpCookieConsentOptions to the Angular frontend. You must set the options in both places or implement a custom solution to fetch and apply them on the client.

Sources:

• ABP GDPR Module Documentation

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• When you migrate from ABP 9.0.4 to 9.2.3, the login process for tenants in a tiered MVC application may trigger the AbpApplicationConfigurationAppService.GetAsync() method. This method is responsible for providing application configuration data (such as localization, settings, and features) to the client after authentication.

• If you see logs indicating that AbpApplicationConfigurationAppService.GetAsync() is being executed during tenant login, this is expected behavior. The application calls this service to retrieve configuration data for the authenticated user and tenant context.

• If logout is not happening as expected, ensure that your authentication and tenant resolution logic is correctly implemented and that the session or authentication cookies are properly cleared on logout.

• For customizations, you can override or extend the AbpApplicationConfigurationAppService to include additional configuration data if needed. However, the default behavior is to call this service after a successful login to initialize the client-side application state.

• If you are experiencing issues with the login or logout flow after migration, review your authentication configuration, tenant resolution, and any custom middleware that may affect the authentication lifecycle.

No verified source available for this specific query.

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The exception you are encountering is due to a breaking change in the Microsoft.IdentityModel.Tokens package version 8.12.1, where experimental code was accidentally released and then removed in a subsequent patch. This causes a MissingMethodException when libraries (such as Microsoft.AspNetCore.Authentication.OpenIdConnect) expect the removed constructor.

To resolve this issue:

1. Downgrade Microsoft.IdentityModel.Tokens
   Change your project's dependency to use Microsoft.IdentityModel.Tokens version 8.11.x (or any version before 8.12.1). This will restore the missing method and resolve the exception.

   In your .csproj or via your package manager:

<PackageReference Include="Microsoft.IdentityModel.Tokens" Version="8.11.2" />

2. Clear NuGet Cache and Rebuild
   After downgrading, clear your NuGet cache and perform a clean rebuild to ensure the correct version is used throughout your solution.

3. Monitor Upstream Fixes
   The issue is upstream and tracked by Microsoft. You can follow the official remediation and future releases here:

   • Release notes for 8.12.1 (accidental experimental code)
   • Remediation PR

4. Wait for ABP/Upstream Updates
   Once Microsoft and/or ABP update their dependencies to a fixed version, you can safely upgrade again.

This is not an ABP-specific bug, but a result of a breaking change in a Microsoft dependency.

Sources:

• https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/releases/tag/8.12.1
• https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/pull/3259

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This behavior is related to how the LeptonX Angular theme (and many responsive Angular applications) handle viewport changes. When the browser window is resized and crosses the mobile breakpoint, Angular components may be destroyed and re-initialized, causing dialogs and their state to be lost. This is a known limitation of the current LeptonX Angular theme implementation.

To mitigate this issue, you can:

1. Use Angular's dialog data persistence:

   • Store unsaved form data in a service or state management (e.g., NgRx, a singleton service) so that if the dialog is destroyed and recreated, the data can be restored.

2. Prevent dialog destruction on viewport change:

   • This would require a custom implementation or patch to the dialog service/component to persist dialog state across layout changes. There is no built-in ABP or LeptonX setting to prevent this at the moment.

3. Consider providing user warnings:

   • You can add a guard or warning when the dialog is about to be closed due to a layout change, prompting the user to save their work.

Currently, there is no official ABP or LeptonX Angular configuration to automatically persist dialog state or prevent this loss of data when switching between desktop and mobile layouts. This is a limitation of the responsive design and Angular's component lifecycle.

If this is a critical issue for your application, you may consider opening a feature request on the official ABP GitHub repository or implementing a custom dialog state persistence mechanism.

Sources:

• Official LeptonX Angular Theme documentation:
  • https://abp.io/en/commercial/latest/themes/lepton-x/angular

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The ABP Platform v9.3 stable release is planned for July 2025. This is the official target date according to the ABP Framework roadmap. You can follow the roadmap for any updates or changes to the release schedule.

Sources:

• https://abp.io/docs/latest/release-info/road-map

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You can securely submit your logs and request support through the official ABP support portal: https://abp.io/support

Please log in with your account, create a support ticket, and attach your logs there. The ABP support team will review your issue and assist you as soon as possible.

If you need guidance on what logs to collect or how to prepare them, please specify, and I can provide detailed instructions.

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To ensure the Inbox pattern works reliably in your ABP microservice architecture, consider the following:

• The ABP Inbox pattern is designed to mark events as processed only after successful handling. If the Processed flag is set to true even when exceptions occur, this typically indicates that the event handler's transaction scope or error handling is not correctly configured.
• When using multiple DbContexts (SQL Server for AbpEventInbox and MongoDB for other data), you must ensure that the event processing and the update of the Processed flag are part of the same transaction in the SQL Server context. If you perform operations in MongoDB and an exception occurs there, but the SQL Server transaction is already committed, the event may be marked as processed prematurely.
• Overriding the InboxProcessor and manually calling MarkAsProcessedAsync is not recommended unless you fully control the transaction boundaries and error propagation.

Recommendations:

1. Ensure that your event handler logic is wrapped in a transaction that includes both the SQL Server and MongoDB operations (if possible). If not, handle failures in MongoDB by throwing exceptions before the SQL Server transaction commits.

2. The ABP Inbox processor should only mark events as processed after the handler completes without exceptions. If you see the Processed flag set without handler invocation, check for:

   • Multiple processors or background jobs running in parallel.
   • Manual or custom code that might be updating the Processed flag.
   • Issues with transaction isolation or context misconfiguration.

3. Review your configuration to ensure the Inbox is set up on the correct DbContext and that only one processor is polling the inbox table.

4. For reliable retry logic, do not catch and suppress exceptions in your event handler. Let them bubble up so the ABP infrastructure can retry the event.

Example Configuration:

Configure<AbpDistributedEventBusOptions>(options =>
{
    options.Inboxes.Configure(config =>
    {
        config.UseDbContext<YourSqlServerDbContext>();
        // Optionally, set polling interval, batch size, etc.
    });
});

References:

• Outbox/Inbox for transactional events
• Microservice Solution: Distributed Events

If you follow these guidelines and ensure that exceptions are not suppressed, the ABP Inbox pattern will only mark events as processed after successful handling, and failed events will be retried as expected.

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To hide the tenant selection on the login screen and resolve the tenant by username in the backend for an ABP Angular UI (v9.0.4, non-tiered), follow these steps:

1. Remove Tenant Selection from the Login UI

   • In Angular, the tenant switch is typically shown based on the multi-tenancy configuration. You can hide the tenant input by customizing the login component template to remove or hide the tenant field.

2. Backend: Resolve Tenant by Username

   • Override the login logic on the backend to determine the tenant based on the username or email address provided. This involves:
     • Searching for the user across all tenants.
     • Once the user is found, set the current tenant context before proceeding with authentication.

   Example implementation (in your AccountController or a custom login service):

public class CustomLoginModel : LoginModel
   {
       private readonly ITenantRepository _tenantRepository;

       public CustomLoginModel(
           IAuthenticationSchemeProvider schemeProvider,
           IOptions<AbpAccountOptions> accountOptions,
           IOptions<IdentityOptions> identityOptions,
           ITenantRepository tenantRepository,
           IdentityDynamicClaimsPrincipalContributorCache contributorCache)
           : base(schemeProvider, accountOptions, identityOptions, contributorCache)
       {
           _tenantRepository = tenantRepository;
       }

       public override async Task<IActionResult> OnPostAsync(string action)
       {
           var user = await FindUserAsync(LoginInput.UserNameOrEmailAddress);
           using (CurrentTenant.Change(user?.TenantId))
           {
               return await base.OnPostAsync(action);
           }
       }

       protected virtual async Task<IdentityUser> FindUserAsync(string uniqueUserNameOrEmailAddress)
       {
           IdentityUser user = null;
           using (CurrentTenant.Change(null))
           {
               user = await UserManager.FindByNameAsync(LoginInput.UserNameOrEmailAddress) ??
                      await UserManager.FindByEmailAsync(LoginInput.UserNameOrEmailAddress);

               if (user != null)
               {
                   return user;
               }
           }

           foreach (var tenant in await _tenantRepository.GetListAsync())
           {
               using (CurrentTenant.Change(tenant.Id))
               {
                   user = await UserManager.FindByNameAsync(LoginInput.UserNameOrEmailAddress) ??
                          await UserManager.FindByEmailAsync(LoginInput.UserNameOrEmailAddress);

                   if (user != null)
                   {
                       return user;
                   }
               }
           }
           return null;
       }
   }

• This code searches for the user in the host and all tenants, and sets the tenant context accordingly.

3. Ensure Usernames/Emails are Unique Across Tenants

   • This approach requires that usernames or emails are unique across all tenants.

4. No Tenant Input on Frontend

   • The Angular frontend should only ask for username/email and password.

With this setup, users log in with just their username/email and password, and the backend determines the tenant automatically.

Sources:

• Hide Tenant Switch from an ABP Framework Login page
• ABP Support: Simplifying tenant login

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To generate proxies for a new integration service in an ABP microservice solution, ensure the following steps are completed:

1. Define the Integration Service Interface
   • The interface must inherit from IIntegrationService (or IApplicationService for older versions).
   • Place the interface in the Application.Contracts project of the microservice.

public interface IMyIntegrationService : IIntegrationService
   {
       Task<MyDto> GetDataAsync(Guid id);
   }

2. Implement the Integration Service
   • Implement the interface in the Application project.

public class MyIntegrationService : MyAppService, IMyIntegrationService
   {
       public Task<MyDto> GetDataAsync(Guid id)
       {
           // Implementation
       }
   }

3. Expose Integration Services in the Provider Microservice
   • In the provider microservice's module (e.g., IdentityServiceHttpApiModule), expose integration services:

Configure<AbpAspNetCoreMvcOptions>(options =>
   {
       options.ExposeIntegrationServices = true;
   });

4. Build All Projects

   • Ensure all projects are built so the new interface and implementation are available.

5. Generate Proxies in the Consumer Microservice

   • In the consumer microservice, add a reference to the provider's Application.Contracts project.
   • Run the proxy generation command in the consumer microservice's directory:

abp generate-proxy -t csharp

• Or use ABP Studio's proxy generation feature.

6. Check Remote Service Configuration
   • Ensure the remote service is configured in appsettings.json:

"RemoteServices": {
     "IdentityService": {
       "BaseUrl": "https://localhost:PORT"
     }
   }

7. Register Static Proxies
   • In the consumer's module, register the static HTTP client proxies:

context.Services.AddStaticHttpClientProxies(
       typeof(YourProviderApplicationContractsModule).Assembly,
       "IdentityService"
   );

Common Issues:

• If the interface does not inherit from IIntegrationService or is not in the correct project, proxies will not be generated.
• If the provider microservice is not running or not exposing integration services, the CLI cannot discover the endpoints.
• Always rebuild the solution after adding new services.

Reference:

• Integration Services Documentation

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