Mastering Live Data-Binding with Async Functions in Blazor скачать в хорошем качестве

Mastering Live Data-Binding with Async Functions in Blazor

Discover how to implement `live data-binding` in your Blazor applications, keeping your UI updated with async functions. --- This video is based on the question https://stackoverflow.com/q/69077816/ asked by the user 'Seti Seti' ( https://stackoverflow.com/u/6426254/ ) and on the answer https://stackoverflow.com/a/69078624/ provided by the user 'Henk Holterman' ( https://stackoverflow.com/u/60761/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Live data-binding with async function Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Mastering Live Data-Binding with Async Functions in Blazor Blazor is an exciting framework that brings the world of web development to C- developers. One common challenge developers face while building interactive applications is ensuring live data-binding when using asynchronous functions. In this post, we will explore a typical scenario that demonstrates this issue and provide a clear, structured solution to it. The Problem: UI Not Updating with Live Data-Binding Imagine you are building an interactive counter application in Blazor. You designed an async version of the counter app as follows: [[See Video to Reveal this Text or Code Snippet]] What’s Going Wrong? You've added the code to increment the counter and log its value to the console. However, when you click the button, the UI only displays "1" at the start and only updates to "20" at the end. The live data-binding you expect isn't functioning correctly; the UI fails to reflect the state of the counter until the counting process is complete. The Solution: Properly Implementing Async Functions To achieve live updates in your Blazor application, you need to make a few adjustments to the code. The key is using StateHasChanged() to signal the framework that the UI needs to be updated based on state changes. Here’s the Updated Code [[See Video to Reveal this Text or Code Snippet]] Key Changes Explained Remove Task.Run(): In Blazor, especially in WebAssembly, using Task.Run() is unnecessary and does not provide any benefits as it can even complicate things. Avoid .Wait() or .Result: These can lead to deadlocks. Instead, always use await in asynchronous methods to keep things responsive and prevent blocking operations. Use StateHasChanged(): This method informs the Blazor framework that the state has changed, prompting a UI refresh. Placing it inside the loop allows for multiple updates to happen as the counter increments. Why Use await Task.Delay(500)? Using await Task.Delay(500) instead of Task.Delay(500).Wait() ensures the method remains asynchronous. This allows Blazor to take control of the UI thread, updating the UI after every increment instead of waiting until the entire counting process concludes. Conclusion By following these steps, you can successfully implement live data-binding with async functions in Blazor. This will not only keep your UI updated according to the underlying data changes but also enhance the overall user experience of your application. With a clearer understanding of StateHasChanged() and proper async handling, you're well on your way to building responsive Blazor applications. Happy coding!