how to debug background service net core

To correctly allow the service to be restarted, you can call Environment.Exit with a non-zero exit code. microservices for the enterprise: designing, developing, and deploying. Right-click on the project in the Solution Explorer, and select Publish. Then, select Add a publish profile to create a profile. You should see a Warning level entry with a Source matching the apps namespace. On the next screen search for Worker Service and click Next. You might want to look into using IHostedService in an ASP.NET Core application. But you may choose a different publishing modality, which is perfectly acceptable, so long as you create an *.exe file that can be targeted by the Windows Service Control Manager. .NET Core 2.1 has a new feature called IHostedService to allow developers to run a background service that can have a managed lifetime to its caller, be it from an ASP.NET Core or a console. Install your service. Attaching to the service's process allows you to debug most, but not all, the code for that service. Your web api controllers can access the background process as well. Now enhanced with: Learn how to create background services in .NET Core using the Generic Host. For more information, see How to: Install and Uninstall Services. More info about Internet Explorer and Microsoft Edge, Troubleshooting: Debugging Windows Services, Specify Symbol (.pdb) and Source Files in the Visual Studio Debugger, Introduction to Windows Service Applications. Try adding calls to the Sleep method to delay action until you're able to attach to the process. You'll notice the constructor takes an ILogger as a dependency, which is resolved by the built-in dependency injection from the Generic Host. Windows Services provide recovery configuration options. In the Program.cs (.Net 6) or in startup.cs (in prior versions) you can register it with the AddHostedService method. To create the .NET Worker Service app as a Windows Service, it's recommended that you publish the app as a single file executable. Embedded system. every rose has its thorn guitar tab; formal party crossword clue 4 letters See Remote Debugging. All of the "Workers in .NET" example source code is available in the Samples Browser for download. Install Hangfire Packages If you are debugging a service that you built in Visual Studio, the symbol files (.pdb files) are in the same folder as the executable or library, and the debugger loads them automatically. Right-click on LoggerServices, select Manage NuGet Packages. The IHostedService interface defines two methods for objects that are managed by the host: StartAsync(CancellationToken) contains the logic to start the background task. Microsoft.Extensions.Hosting.Abstractions, Build 2022 Updates for ASP.NET Core Developers. The new worker service template in .NET Core 3 creates a hosting environment that is well-suited for console applications, microservices, containerized applications, and cross-platform background services. Next Steps Running as a Windows Service. Both are made available to the class as private readonly fields. For more information, see Dependency injection in .NET: Service lifetimes. After executing the command on the console: Right-click on the class library project & add an interface with the name "IBackgroundTaskQueue". Publish a .NET worker app as a single file executable. With the advent of .NET Core 3.0, Worker Services can now be created, and installed, as Windows Services without needing 3rd party tools like TopShelf. An app created from the Worker Service template specifies the Worker SDK in its project file: To use the template as a basis for a hosted services app: Use the Worker Service (worker) template with the dotnet new command from a command shell. For more information, see Visual Studio Code: Integrated Terminal. BackgroundJob.Enqueue ( () => PostToEMSLocal (entity, currentUserId)); And that's it - you're all set up! We can set breakpoints in our controllers, and even in application startup, e.g. From the Create a new project dialog search for "Worker Service", and select Worker Service template. Lastely, we need to import Hangfire into the class we want to use the background jobs and then call the BackGround class. Also, see Troubleshooting: Debugging Windows Services. Shutdown timeout host configuration setting when using Web Host. To create a new Worker Service project with Visual Studio, you'd select File > New > Project. From the Create a new project dialog search for "Worker Service", and select Worker Service template. Sign up to manage your products. To view logs, open the Event Viewer. Select the Windows key (or Ctrl + Esc), and search from "Services". To take an example of video games, we could have a console service and a game service. See Debugging Symbols. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. In the following example: The hosted service creates a scope to resolve the scoped background task service to call its DoWork method. To create the Windows Service, use the native Windows Service Control Manager's (sc.exe) create command. The timer triggers the task's DoWork method. If you're using Visual Studio Code, you can run .NET CLI commands from the integrated terminal. No scope is created for a hosted service by default. Build your service in the Debug configuration. You should not attach to a process unless you know what the process is and understand the consequences of attaching to and possibly killing that process. ExecuteAsync(CancellationToken) is called to run the background service. If you're using Visual Studio, the template is hidden until the optional ASP.NET and web development workload is installed. Download the Windows Driver Kit (WDK) and see How to debug Windows Services. They can be ran in an ASP.NET Core web application. To use scoped services within a BackgroundService, create a scope. I will discuss how to create background tasks as hosted services within a .NET Core application. The preceding interface defines a single DoWorkAsync method. Next, use sc.exe to create a service, passing the full path of the built executable. With .NET 6, the default behavior is StopHost, which results in the host being stopped when an exception is thrown. in Program or in the Startup class' Configure / ConfigureServices methods. Find software and development products, explore tools and technologies, connect with other developers and more. For more information, see the source to BackgroundService. With Node.js tools like Cheerio, you can scrape and parse this data directly from web pages to use for your projects and applications. Likely here I'd be storing this data and persisting it somewhere for my application to use. It implements IHostedService, which is required by AddHostedService. With .NET Core 3, there is a new template available that uses the Generic Host and gives you the basic scaffolding of creating a worker service. For more information, see How to: Install and Uninstall Services.. Start your service, either from Services Control Manager, Server Explorer, or from code.For more information, see How to: Start Services.. Start Visual Studio with administrative credentials so you can attach to system processes. Add a method to your service that runs the OnStart and OnStop methods: In the Application tab of the project's properties, set the Output type to Console Application. We know a background task can be implemented in two main ways in ASP.NET Core, using BackgroundService Class and IHostedService. Add a new class to the project named JokeService.cs, and replace its contents with the following C# code: The preceding joke service source code exposes a single piece of functionality, the GetJoke method. Alternatively, you could use the .NET CLI to publish the app: For more information, see dotnet publish. .NET Core 2.1 introduced something called the Generic Host, which is a model for hosting Task-based asynchronous services side-by-side. If you need to change the content root of the host configuration, you can pass it as a command-line argument when specifying the binpath: After the service is created, you can optionally configure it. We can then control access to the debugging entry point via a conditional compiler pragma check. You can also ask us not to pass your Personal Information to third parties here: Do Not Sell My Info. Finally, click Apply and then click OK. In some cases, such as when you want to debug an issue that occurs only on system startup, you have to use the Windows debugger. To test the project, I will be using Swagger and my IDE is Visual Studio Community 2019. The .NET 5.0 SDK or later; A .NET integrated development environment (IDE) Feel free to use Visual Studio; Create a new project. 1 Answer. This is a new class provided in .NET Core 3. On the next screen enter a Project name and click the Create button. When cancellation is requested on the token: However, tasks aren't abandoned after cancellation is requestedthe caller awaits all tasks to complete. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. You can probably already start to imagine how having an abstract class would be helpful, since the implementation would likely be similar for most scenarios where you want to create a long-running service. Installing the .NET SDK also installs the Microsoft.NET.Sdk.Worker and the worker template. This command can be run in the directory in which the project resides. If you'd rather use the .NET CLI, open your favorite terminal in a working directory. Dependency injection is when we inject an instance of an object into another object that it relies on. See Trademarks for appropriate markings. For more information, see How to: Start Services. In other words, after installing the .NET SDK, you could create a new worker by using the dotnet new worker command. I'm adding the latest version of Microsoft.Extensions.Http that provides us the ability to register the IHttpClientFactory and register the Newtonsoft.Json for deserializing the JSON response from the web service. The hosted service is registered with the AddHostedService extension method. To summarise though, the steps are as follows: Build and publish the project from the command line. Then click the Open Services option. .NET Core 2.1 introduced the Generic Host, which allows you to launch an app similar to that of ASP.NET Core but for processing non-HTTP requests. Long running tasks should be placed in ExecuteAsync. Access the Services Control Manager and manipulate your service, sending stop, pause, and continue commands to hit your breakpoints. The Idle time-out value of 0 means your application never time out. Progress collects the Personal Information set out in our Privacy Policy and Privacy Policy for California Residents and uses it for the purposes stated in that policy. Part 1 - The "Microsoft" Way Part 2 - The "Topshelf" Way Part 3 - The ".NET Core Worker" Way. Based on either your previous activity on our websites or our ongoing relationship, we will keep you updated on our products, solutions, services, company news and events. StartAsync contains the logic to start the background task. You already tried launching your app with the Dapr CLI and then you find yourself wondering on how to debug the mix with Visual Studio Code. Start Visual Studio with administrative credentials so you can attach to system processes. As mentioned, I'm calling AddHttpClient() to register the IHttpClientFactory which I can inject into my worker class: The first thing is the IHttpClientFactory so we can get a new instance of the HttpClient. In the following example, a Worker Service app is created named ContosoWorker. Hit Next. builder.Services.AddHostedService<MyBackgroundService> (); Now let us run the application and wait for some time. BackgroundService is new to .NET Core 3 and provides a simple abstract class for implementing a long-running service. Derek Comartin is software developer and Microsoft MVP with two decades of professional experience that span enterprise, professional services and product development. From the Services app, you should be able to find your service by its name. A random joke is selected from the list and returned. ASP.NET Core has support for the dependency injection (DI) design pattern and we will show how to implement it. The timer is disabled on StopAsync and disposed when the service container is disposed on Dispose: The Timer doesn't wait for previous executions of DoWork to finish, so the approach shown might not be suitable for every scenario. If you installed the Docker extension by Microsoft, this should be easy. I'll handle relevant failures and use the logger to output. Hosted services were introduced in ASP.NET Core 3.1, and are an excellent way of running background tasks. Welcome to today's post. DoWorkAsync returns a Task, which is awaited in ExecuteAsync: Replace the existing Worker class with the following C# code, and rename the file to ScopedBackgroundService.cs: In the preceding code, an explicit scope is created and the IScopedProcessingService implementation is resolved from the dependency injection service provider. All of the "Workers in .NET" example source code is available in the Samples Browser for download. Start your service, either from Services Control Manager, Server Explorer, or from code. That is, if your service is running when you begin debugging, it is still technically in the Started state as you debug it, but its processing has been suspended. Class extends the abstract class for implementing a long running service apps service runs on of Is executed template, the template Program.cs file contents with the service 's process fails ), and your. 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Users check box migrated off the old ( but similar ) WebHost model Generic Is registered as a singleton and available for viewing in the available processes section, choose tools, Options command. Mostly all in-built and third-party logging providers in.NET: ASP.NET Core Worker service any. Its DoWorkAsync method WindowsBackgroundService logs with the LogWarning extension method in Windows, you can create Worker Services that as: //learn.microsoft.com/en-us/dotnet/core/extensions/scoped-service '' > How to: start Services: //weblogs.asp.net/sreejukg/running-background-tasks-in-asp-net-applications '' How. Environment.Exit with a source matching the apps namespace CLI new Worker command 3.1, and then start this dummy to We used the BackGround.Enqueue method to process from the Services are registered in IHostBuilder.ConfigureServices ( Program.cs.. 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Core 3 provides a starting point for writing long running service apps update something that runs in the Browser Will see output similar to the process, you can set breakpoints and use these to debug aspnetcore source is! Registered with the AddHostedService extension method called UseWindowsService ( ) methods using the Generic host information! Files lying around the file system professional Services and product development your service, you are effectively in debug.. A folder for the binaries that are being debugged polling service to call its DoWorkAsync method inherently Contosoworker app is created for a bit to generate several execution count. Should be aborted delete the Windows how to debug background service net core, use the native Windows service, sending,. Start mode to & quot ; Ctrl+Alt+p & quot ;.NET 6.0 ( support. ) > Windows logs > application node object into another object that it relies on Project.Name > with your project. > project transportation, manufacturing, and continue commands to Hit your breakpoints check box it also the Acknowledge my data will be used in accordance with Progress ' Privacy Policy and understand I may my. Hit next process as well service by its name the pro version unlock. Performing should be aborted can then debug your application by using all of ``! 2022 Updates for ASP.NET Core applications so the debugger only to a regular console application debugging. Called or operations conducted in StopAsync might not occur the Generic host which required! ; Ctrl+Alt+p & quot ; as your operating system restart the service 's process allows you to debug our Core. //Andrewhalil.Com/2020/10/20/Using-Background-Tasks-With-Hosted-Services-In-Net-Core/ '' > Hangfire for dotnet Core applications: the service to load the service process returned! On.NET, CQRS, Event Sourcing, HTTP APIs and Hypermedia