Does an ASP NET Core 8 application use a StartUp.cs file?

If an application is designed to start when Windows starts (as opposed to when a user logs in), your only option is to involve a Windows Service. Either write the application as a service, or write a simple service that exists only to launch the application. On the other hand, if you just want your application to start on user login, you can use methods 1 or 2 that Joel Coehoorn listed. Let’s assume you have the default appSettings.json in place. The example code below would return the configuration Default log level setting from the JSON configuration file.

Azure Function – Error building configuration in an external startup class

• I did not try a dependency on docker.service because docker.service won’t start until a docker command is run.
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• Now that you have your .ps1 and .cmd files in their respective paths and with the script for each, you are all set.
• It’s not yet clear to me how easy it is to just add or remove a file in that folder without also referencing the internal database Windows uses for these locations.
• If you run an unsigned script that was downloaded from the internet, you’re prompted for permission before it runs.

Refer GitHub for sample startup auditing firms project of .NET 8 Isolated function. As I mentioned in the comments, .NET 8 Isolated function doesn’t have a separate Startup class. I looked at similar questions and problems in different links but couldn’t find any solution.

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That task simply starts “Docker for Windows.exe” (or whatever is the name of your docker executable). The best part of the tool is that it supports PowerShell scripts (.ps1), which means you can run a PowerShell script automatically at system startup using any of the three available methods. Now that you have your .ps1 and .cmd files in their respective paths and with the script for each, you are all set. I’m using NLog, and even building a new ServiceCollection, calling .CreateBuilder() on any service collection, creating a logging service … None of that would write to a log file during ConfigureServices.

This package is needed for startup detection in IIS hosted applications. Since I wrote this, Windows 10 was released, which changes how the Start Menu folders work… It’s not yet clear to me how easy it is to just add or remove a file in that folder without also referencing the internal database Windows uses for these locations.

Instead, everything is configured directly on the web application builder or the built app instead. My question is how do I actually set the app to run at startup. Then, all containers with a restart policy of “always” will start up. Where ecstatic_ritchie is an example name specifying the container in interest. If necessary execute PowerShell command below to enable PowerShell scripts execution. I need to find a way to automatically run this script after the computer starts.

In case you have multiple hosts using the same namespace in your solution, be sure to have them on a separate IISExpress port (and delete the .vs folder and restart vs). This fixed it for me. (windows 10) In the end i deleted the “bad” IIS application and re-created an identical one with the same name. In my case, my website’s output path is changed by somebody, the IIS Express even not load OWIN, and the setup class will not be hit of course. By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy. While the Startup.cs class is still supported and can be used, it’s no longer required. You can choose to keep your configuration in Program.cs for simplicity, or split it between Program.cs and Startup.cs for better organization, especially for larger applications.

In ASP.NET Core (which includes .NET 8), the Startup.cs class is still a central part of the application’s configuration, but it’s not the only way to set up your application. The newer versions of .NET Core have introduced a more flexible approach using the Program.cs file. Connect and share knowledge within a single location that is structured and easy to search. With the new approach with ASP.NET Core, not to use an explicit Startup class, the explanations below with ConfigureServices and Configure no longer apply.

ASP.NET Core 6+ how to access Configuration during startup

• The best part of the tool is that it supports PowerShell scripts (.ps1), which means you can run a PowerShell script automatically at system startup using any of the three available methods.
• You can prove this by throwing an exception in the Configuration method of the Startup class.
• Once we have the builder created, the configuration is available.
• Where ecstatic_ritchie is an example name specifying the container in interest.
• After I remove my AppStart from “project.Startup.AppStart” and let they both Startup.cs and Startup.Auth.cs with “project.Startup” namespace, everything was back to work perfectly.

On top of what the name suggests, on-failure will not only restart the container on failure, but also at system boot. Unrestricted – loads all configuration files and runs all scripts. If you run an unsigned script that was downloaded from the internet, you’re prompted for permission before it runs. My conclusion so far is PowerShell uses Out-File to output to another command or in this case a log file. If you are using Write-Host within your PowerShell scripts, and are also using Task Scheduler (as shown in the posts above), you don’t get all the output from the command line. I had same problem when I added Owin to an existing web project.

How do I run a PowerShell script when the computer starts?

Added that right to the extension method class, and I was able to write to a log (“the” log) during ConfigureServices and after. As before, you cannot access the logger before building the service container (builder.Build()) though, for the same reasons explained below. In your Program.cs you can also group code in a method and call that to keep it less run-on a bit or to group similar things. I will not put all the code in; I will not put a full list of using directives here but just enough to demonstrate the technique and I will leave out some method code. This is not enough or even perhaps too much for your solution and will need your custom touchup. Once we have the builder created, the configuration is available.

I have a small application with a CheckBox option that the user can set if they want the app to start with Windows. Especially when I want those settings from environment variables, which is often the case with containerized environments, and maybe avoid leaking secrets in json files. I know the question originally asks for ASPNetCore but if you happen to looking to do the same for a worker service, and landed here like I did, hopefully, this answer helps you. The 2021 answer for this is described very nicely in this blog post. If you’re using a recent Ubuntu (e.g., 20) and you installed docker via apt, all you have to do is sudo systemctl enable –now docker. You can also run the script in the background, regardless of user login.

I eventually found the problem was due to the following in the web.config file. If you are having trouble debugging the code in the Startup class, I have also had this problem – or I thought I did. The code was firing but I believe it happens before the debugger has attached so you cannot set breakpoints on the code and see what is happening.

Azure Function – Error building configuration in an external startup class

That will enable the docker service in systemd and start it right then if it hasn’t already started. The docker service doesn’t start off enabled when it is installed, but any docker command that uses the docker socket (e.g., docker ps) will cause systemd to start the service. Enabling the service will cause it to start at boot time every time. Execute PowerShell command below to run the PowerShell script .ps1 through the task scheduler at user login. Program.cs file now often contains the configuration code that you would traditionally put in Startup.cs.

It’s where you create the host for the web application and can configure services and the app pipeline. This is where you could set up OAuth and other middleware components. In order to debug a .NET Core app which is failing on startup, I would like to write logs from within the startup.cs file. I have logging setup within the file that can be used in the rest of the app outside the startup.cs file, but not sure how to write logs from within the startup.cs file itself.

I’m using an Azure Function in “.Net 8”, I’m trying to use a custom start-up by following this article here. I’m working on converting a web application that runs on ASP.NET MVC on .NET framework to run on .NET 8.

How do I write logs from within Startup.cs?

MSDOC states that isolated functions contain a Program.cs file which provides complete access to the Host instance for setting any code configurations & dependencies. If you’re setting up OAuth, this would typically be done in the ConfigureServices method (whether in Program.cs or Startup.cs). You would use the services.AddAuthentication() method to configure the authentication services.

If you’re running PowerShell v2.0 it might be a little different. If you are seeing this issue with IIS hosting, but not when F5 debugging, try creating a new application in IIS. You can prove this by throwing an exception in the Configuration method of the Startup class. I also tried removing my Startup class and using Visual Studio to add a new one using the OWIN Startup Class type in Add New Item and that isn’t getting called either.

For the created containers use docker update to update restart policy. Doing this will execute the cmd file every time on startup. Here is a link of how to create a .cmd file if you need help. Make sure you have installed Microsoft.Owin.Host.SystemWeb package in the project.

In Program.cs, the WebApplicationBuilder is created shown below. I used Set-ExecutionPolicy RemoteSigned -Scope CurrentUser to get around the script execution problem. I still would have preferred to run it on a per-process basis though. I had the following but still could not land on a break point. After I remove my AppStart from “project.Startup.AppStart” and let they both Startup.cs and Startup.Auth.cs with “project.Startup” namespace, everything was back to work perfectly. In my case this Microsoft.Owin.Host.SystemWeb package is present in the project.

Next I tried adding a second Startup class since I know it will throw an exception if there is more than one OwinStartup attributes defined, but it isn’t throwing any exception there. I had the OwinStartup configuration code working perfectly and then it stopped working. Unfortunately I’m not sure exactly what I did to get it to stop working and am having a really hard time figuring it out. Find centralized, trusted content and collaborate around the technologies you use most. I use a solution avoiding 3rd party loggers implementing a “logger buffer” with ILogger interface.

To setup Serilog in asp.net-core application, check out the Serilog.AspNetCore package on GitHub. If you absolutely need to log within ConfigureServices, then you can continue to use the WebHostBuilder which will create the legacy WebHost that can inject the logger into the Startup class. Note that it’s likely that the web host will be removed at some point in the future. So you should try to find a solution that works for you without having to log within ConfigureServices.