Скачать или смотреть Resolving Mudblazor Razor Page Loading Issues: Understand Why Your Page Renders Twice

Discover solutions to the problem of your Mudblazor Razor page rendering multiple times and effective ways to manage state and events in Blazor WebAssembly.
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Understanding Mudblazor Razor Page Rendering Issues

As developers utilizing Blazor WebAssembly and Mudblazor for building interactive web applications, encountering rendering issues can be a common challenge. A common dilemma is when a Razor page loads more than once during its lifecycle. In this guide, we'll delve into this issue, discuss why it occurs, and explore practical solutions to avoid these rendering pitfalls.

The Problem: Multiple Page Loads and Reactive Behavior

When working with Razor components, especially in a client-side framework like Blazor, it can be confusing to observe your page rendering multiple times despite having proper asynchronous initialization methods.

Key Observations

OnInitializedAsync: As expected, this method was called only once when the page was initialized.

Razor Page Rendering: In contrast, the Razor page seemed to be re-rendering multiple times.

Dynamic Value Updates: The MudTextField displayed the value of the message variable only after the second render, leading to confusion.

The Triggering Event: OnKeyPressed

The addition of an OnKeyPressed event caused the page to re-render every time a key was pressed. Although this behavior is often anticipated in reactive programming, it can lead to unnecessary complications, particularly in how users perceive the application's responsiveness.

Solution Strategy: Refactor and Separate Logic

After troubleshooting the issue, a practical solution was discovered that involves creating a cleaner separation of concerns in your Razor components.

Step 1: Create an Identical Razor Page

Clone your existing Razor page to maintain the original functionality and enable testing of modifications without losing your original work.

Step 2: Separate Code Logic

Move the business logic into a separate class, preferably to keep your Razor file tidy and focused on UI-related code.

This approach can help manage the state more effectively and avoid serial loading issues.

Step 3: Alternate Razor Component on KeyPress

Instead of directly modifying the existing component during the keypress events, switch to rendering an alternative Razor component. This approach allows you to encapsulate behavior more cleanly.

Example Refactored Code Structure

Below is an example of how your code could be structured following the aforementioned steps:

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

Conclusion: A New Hope for Performance in Razor Pages

In conclusion, addressing the multiple loading of Razor pages within Mudblazor requires systematic restructuring and an understanding of Blazor's reactive behaviors. By separating concerns and handling state in a more organized manner, you can improve the responsiveness and maintainability of your application.

If you have further suggestions or alternate solutions to this problem, sharing them could benefit the wider community of developers facing similar challenges.

Handling state and reactivity in modern frameworks can be challenging, but with the right strategies, we can create a seamless user experience. Happy coding!