Скачать или смотреть Simplifying Dynamic Value Calculation in Blazor: Displaying the Sum of Two Integers

Learn how to easily display the sum of two dynamic integers in Blazor during the HTML rendering process. Explore methods to handle updates seamlessly for a smooth user experience.
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This video is based on the question https://stackoverflow.com/q/68487362/ asked by the user 'dreanor' ( https://stackoverflow.com/u/12367270/ ) and on the answer https://stackoverflow.com/a/68487594/ 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.

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Simplifying Dynamic Value Calculation in Blazor: Displaying the Sum of Two Integers

When working with Blazor, one might encounter scenarios where you'd like to display the sum of two integers, particularly when one of these integers can change dynamically at runtime. This can seem daunting at first, but it’s actually quite straightforward.

The Challenge

Imagine you have two integers in a Blazor application:

v1: a value that may change at any time during the application’s runtime.

v2: a property from a model, which represents a list of data.

Your goal is to display the sum of these two integers for each item in a list when rendered in an HTML table. Let's explore how to achieve this efficiently!

Setting Up Your Blazor Component

First, ensure your basic component structure resembles the following:

Code Structure

[[See Video to Reveal this Text or Code Snippet]]

Breaking Down the Code

Table Setup: The <table> element contains a loop that iterates through a list of objects stored in bar.

Rendering Each Row: For each foo in bar, it creates a new row <tr>.

Displaying the Sum: Inside the row, you calculate and display the sum of v1 and v2 using the syntax @ (foo.v2 + v1). This is where the summation takes place.

Handling Dynamic Changes

When v1 Changes

In the Blazor lifecycle, if v1 changes as a result of user interactions (like clicking a button), Blazor will automatically trigger a re-render of the UI. You don't need to do anything extra for it to display the updated value.

Managing State Updates

However, if v1 changes due to a background process or an event outside Blazor's normal lifecycle (like a Timer or another asynchronous process), you need to inform Blazor to update the UI.

In this case, invoke StateHasChanged() to ensure the component re-renders and reflects the new value of v1:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Handling dynamic values in Blazor is simpler than it might initially appear. By using the @ (expression) syntax, you can easily calculate and display sums during the rendering of your component. Remember to call StateHasChanged() whenever values change through background processes to keep your UI consistent and up-to-date.

Now, you can confidently display the sum of v1 and v2 in your Blazor applications, enhancing the user experience and interactivity of your components!