![]() ![]() The list of existing customers is the default Index page for the /Customers route, and customers are created with the Create page. The application provides a simple user interface for creating new customer records and viewing a list of existing customers. The database runs in the default SQL Server instance installed with Visual Studio. ![]() The database structure is created and modified using EF Core Migrations in the code-first approach. The project structure is based on the default Razor Pages project template, and adds Entity Framework Core 3.1 with the SQL Server driver. The repo contains a Visual Studio solution, RazorDrop, containing a C# ASP.NET Core 3.1 Razor Pages project, RazorDrop. In this tutorial you’ll be working with an application you’ll clone from a GitHub repository. The code is limited to what’s necessary to demonstrate the topics discussed in this post, so don’t expect production-ready code that implements all the SOLID principles. This is an introductory- to intermediate-level post. You should be familiar with the Visual Studio user interface. In addition to these tools you should have a working knowledge of C#, and some experience with HTML, CSS, and JavaScript. NET Core cross-platform development workload Visual Studio 2019 (the Community edition is free) with the following options: NET Core SDK (includes the APIs, runtime, and CLI) You’ll need the following development resources to build and run the case study project: You’ll see how to make controller actions and data repository calls asynchronous using the features of C#, ASP.NET Core, and Entity Framework Core. This post will show you how to add asynchronous processing to an existing ASP.NET Core 3.1 Razor Pages application that’s been built according to the Model-View-ViewModel (MVVM) design pattern. That can tie up a lot of threads, compounding thread pool utilization problems. Network latency, storage subsystem performance, and the load on the database server can all have a detrimental effect on performance, particularly if there’s a long queue of requests and your web server is waiting for them to be executed synchronously. Handling web requests synchronously ties up threads which can be used to process other requests, leading to thread pool starvation and decreased performance.ĭata access code is often the slowest part of a web request because it can involve calling a remote machine and accessing a physical disk to retrieve data. To do this they need to allocate and use a limited resource, process threads, efficiently. Why is it important to make these components asynchronous? Web applications should be able to handle many requests simultaneously. Data access actions – Entity Framework Core includes asynchronous features to improve the performance of code that relies on calls to a persistent data store.Razor Pages controller actions – the entire call stack is asynchronous, so you can benefit from that by making your controller actions asynchronous.There are two categories of hot code paths where it’s particularly important to use asynchronous processing in data-driven ASP.NET Core applications: A hot code path is one that is “.frequently called and where much of the execution time occurs.” Making hot code paths asynchronous is one of Microsoft’s ASP.NET Core Performance Best Practices. Using the asynchronous features of C#, ASP.NET Core, and Entity Framework Core is a good way to do this. If you’re building web applications with ASP.NET Core you’re likely to be looking for ways to make them performant as they scale. Adding Asynchronous Processing to ASP.NET Core 3.1 Razor Pages Applications Built With the MVVM Design Pattern ![]()
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