Cannot consume scoped service ‘IScoped’ from singleton ‘Microsoft.Extensions.Hosting.IHostedService’.
In our projects we are using IHostedService to run background processes. What I have seen is that when injecting a scoped service into the IHostedService you get a
InvalidOperationException on startup. The first time you get this exception, it is takes some time to figure out what is going on. This blog post will help you to resolve the problem faster.
Continue reading “Injecting a Scoped service into IHostedService”
Azure SQL, do not forget to schedule maintenance
Many users on Azure SQL Server do not realize they have to do their own maintenance on Indexes. This index will slowly become fragmented and the performance will decrease over time. Azure SQL does not have a Job scheduler (agent) like on premise. In this post I’ll describe how to schedule a maintenance job from an ASP.NET Core application.
Continue reading “Run maintenance jobs on Azure SQL”
Only a few years back Windows Communication Foundation (WCF) was the way to do communication on the Microsoft platform based on SOAP protocol. Now a days new services are mostly build on top of Representational State Transfer (REST) Services. Sometimes you have to access a ‘legacy’ SOAP services for .NET Core. .NET Core has limited WCF support. In this blog post I’ll explain how to consume SOAP services form .NET Core.
Continue reading “Access XML SOAP services in .NET Core and client certificates (SSL)”
In the previous blog post called background tasks with ASP.NET Core using the IHostedService Peter described how to use the IHostedInterface for background tasks. In this post, we continue on this subject and add some pointers on how to perform scheduled background tasks.
In many software projects, there are repetitive tasks; some do just repeat every x seconds after the last instance is finished but you might also have to run a task on a schedule like every 10 minutes. When building repeating or scheduled tasks there are many options on how to approach the scheduling and this approach can be influenced by a number of technical choices.
Building the scheduling yourself is an option when you do not want to add extra dependencies to your project, have full control or just want an extra technical challenge. An out of the box solution you can a look at Hangfire, Quartz.net, or an external service that does an http call every x seconds to trigger the task (something like Pingdom).
Continue reading “Run scheduled background tasks in ASP.NET Core”
In the past weeks we have upgraded our ASP.NET Core 2.0 project to 2.1. The main reason for the upgrade is using the latest signalr capabilities and hosted services. The issues we had are related to the features we use. In our case the upgrade encountered some minor issues. In this blog post I’ll show what we had to change and give some tips on how to upgrade.
Continue reading “Upgrade ASP.NET Core and Entity Framework Core 2.0 to 2.1”
Knowing the differences when you run your application in a Development environment
When building ASP.NET Core 2 web applications, most projects are initializing Kestrel with the CreateDefaultBuilder. If you use this extension method to configure Kestrel, it is good to know what is set and what differs when you are running a Development configuration or any other configuration. In practice there are two differences. In this blog I’ll explain the two differences.
Continue reading “WebHost CreateDefaultBuilder, what differs if you run in Development”
Run background processes with the IHostedService and how to inject your services with dependency injection
Many services need background processing. The ASP.NET Core 2.X IHostedService interface gives you an easy implementation skeleton to implement background processes. The Hosted Services are registered in the dependency injection at startup and started automatically. You do not have to do the pluming to get them started at startup. On shutdown you can implement a graceful shutdown. When running background processes there a few pitfalls to avoid. In this blog I’ll introduce the IHostedService and how to avoid common memory leaks when implementing the hosted service.
Continue reading “ASP.NET Core background processing with IHostedService”
Putting your tools in the middle of the conversation
ChatOps is an accelerator for the implementation of DevOps. DevOps is all about enabling the team to get feature s into production quickly. This is done by unifying Dev and Ops and advocate automation and monitoring at all steps of software construction. ChatOps is a way of combining and centralizing all the tooling for your team into one shared messaging tool. By centralizing access to your systems to one central messaging tool, you increase transparency, collaboration and productivity of you team.
Continue reading “Introduction to ChatOps”
Find the root cause of what really happened to you disposable object.
Working with ASP.NET core I have seen this error multiple times and can be hard to debug. The error can have multiple root causes. It can be a real pain to find the cause and it is sometimes fixed by only taking care of the symptoms. By finding the root cause, you can take the appropriate action in your code.
Continue reading “Cannot access a disposed object in ASP.NET Core when injecting DbContext”
Tips and tricks Inline Powershell task VSTS, combine webhooks, rest api calls to get more out of your VSTS/TFS build and release pipelines
Maximize how you use your VSTS build and release pipeline with Inline Powershell tasks. In this blog series ‘Tips and Tricks for Inline Powershell’, I will show simple samples on how to get more out of your pipelines. This blog post: Let your build work for you Continue reading “Let your build work for you, shorten the feedback loop”