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Run asynchronous code before hosting get started

The goal

To run some async code before the host get started.

There has been post talking about various techniques before Microsoft.Extensions.Hosting version 8.0.0. For example: https://andrewlock.net/running-async-tasks-on-app-startup-in-asp-net-core-part-1/.

The problem was, it was kind of hard to:

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Accept the parameter on the attribute

using Microsoft.AspNetCore.Mvc;

namespace FiltersDemo;

public class ExampleFilterAttribute : TypeFilterAttribute
{
    public ExampleFilterAttribute(AnEnum enumValue) : base(typeof(ExampleFilter))

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HTTP Status Code & Typical Usage

This page will be used to note down different commonly used status code and the scenarios.

Http Status Code: 200 OK

200 OK, which means it succeeded.

Typically used as a response for synchronous operations.

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Handling Special Characters in RouteValues for CreatedAtAction

When working with ASP.NET and the CreatedAtAction method, the process of providing route values is often straightforward. Consider the following example:

[HttpPost]
public async Task<IActionResult> Post(ApiVersion apiVersion)
{
    ...
 var routeValues = new 

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How to replace a service in C# dependency injection

Discover the Power of the Replace Method!

Unveil the hidden gem within C# dependency injection – the Replace method – to effortlessly update services. Experience the simplicity firsthand:

Suppose you're aiming to substitute the initial singleton service of IAnalyzer with the innovative SimpleAnalyzer implementation. Behold the elegance of the solution:

services.Replace(ServiceDescriptor.Singleton());

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Hash a string to a guid

Sometimes, you may encounter a situation where you require a GUID-formatted key but only have a loose string at hand. In such cases, this simple solution can prove to be quite effective.

Goal

This is the API I want:

Guid CreateGuid(string value);

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public sealed class ApiVersionAttribute : Asp.Versioning.ApiVersionAttribute
{
    public ApiVersionAttribute( string version )
        : base( CustomApiVersionParser.Default, version ) { }

    public ApiVersionAttribute( string token1, string token2, string? token3 = default )
        : base( new CustomApiVersion( token1, token2, token3 ) ) { }
}

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Needs to do this from time to time.

  <ItemGroup>
    <Compile Include="..\ServiceProfiler2\src\ServiceProfiler.Analysis.DataModels\Insights\InsightRecord.cs" Link="InsightRecord.cs" />
  </ItemGroup>

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Command:

docker run -it -p localport:containerport --rm <containerTag>

Example:

docker run -it -p 8080:80 --rm dotnet-diag-webapi-example:latest

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Bash into containers

Docker container

docker exec -it <container name> /bin/bash

Kubernetes