FoxLearn | How to

How to implement an asynchronous socket in C#

By Tan Lee Published on Jan 07, 2025 955

A socket is the endpoint for two-way communication between two processes operating over a network.

How to fix InvalidOperationException: No service for type 'Microsoft.AspNetCore.Identity.UserManager'

By Tan Lee Published on May 11, 2024 4.55K

To resolve the error 'InvalidOperationException: No service for type 'Microsoft.AspNetCore.Identity.UserManager[Microsoft.AspNetCore.Identity.IdentityUser]' has been registered,' follow these steps when customizing ASP.NET Core Identity.

System.InvalidOperationException: Unable to resolve service for type while attempting to activate

By Tan Lee Published on Jan 11, 2025 3.61K

The error System.InvalidOperationException: Unable to resolve service for type while attempting to activate typically occurs in .NET applications when the dependency injection (DI) container is unable to resolve or instantiate a service that is being requested.

Unable to resolve service for type 'Microsoft.AspNetCore.Identity.RoleManager'

By Tan Lee Published on May 31, 2024 2.12K

The error "Unable to resolve service for type 'Microsoft.AspNetCore.Identity.RoleManager'" in ASP.NET Core typically occurs when the dependency injection can't find or inject a required service.

How to take a screenshot with Selenium WebDriver

By Tan Lee Published on Jan 10, 2025 501

Taking screenshots in Selenium WebDriver is a key feature for automated testing, allowing testers to capture visual evidence of issues, bugs, or test failures.

Sending JSON in .NET Core

By Tan Lee Published on Jan 10, 2025 337

In .NET Core, the Microsoft.Azure.Storage.Queue package has been replaced with the Azure.Storage.Queues package, and the CloudQueueMessage you used to send messages via queue.AddMessageAsync() has been simplified into the SendMessageAsync(string) method.

Writing Files Asynchronously with Multiple Threads in .NET Core

By Tan Lee Published on Jan 10, 2025 618

When building applications that need to write to a file from multiple threads, it's crucial to ensure thread safety and avoid race conditions.

Manipulating XML Google Merchant Data with C# and LINQ

By Tan Lee Published on Jan 10, 2025 385

When working with data from the Google Merchant Center, you often receive a Google Product Feed, typically in XML format, containing product information.