Скачать или смотреть Solving the Blazor WASM and SignalR Serialization Challenge: Sending Custom Objects Made Easy

Learn how to efficiently send custom objects like `User` from your WebAPI server to a `Blazor WASM` app using `SignalR`. Follow this guide to resolve serialization issues and ensure smooth communication between your server and client.
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This video is based on the question https://stackoverflow.com/q/65865648/ asked by the user 'Parakoopa' ( https://stackoverflow.com/u/7336464/ ) and on the answer https://stackoverflow.com/a/65868108/ provided by the user 'Brennan' ( https://stackoverflow.com/u/9175226/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the Blazor WASM and SignalR Serialization Challenge: Sending Custom Objects Made Easy

When building applications using Blazor WebAssembly (WASM) and SignalR, you might run into challenges when sending custom objects from your WebAPI server to your Blazor WASM client. This post will guide you through solving a common serialization issue, particularly when working with a User class. Let's dive into what the problem is and how to fix it.

Understanding the Problem

Let's clarify the scenario. You have a class User that represents a user in your application:

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

You are attempting to send instances of this class from your server to your Blazor client using SignalR. While sending simpler data types like strings and integers works seamlessly, you encounter issues when sending your custom User object – receiving nothing on the client-side.

Analyzing the Root Cause

Upon closer inspection of your method for sending data, the issue appears to stem from how you are serializing the User object. In your Register method, you are sending state.user as a string:

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

This format treats the User object as a string, which means the Blazor client cannot deserialize it back into a User type. This mismatch is the root of your issue.

Resolving Serialization Issues

Here’s how you can resolve this serialization issue step by step:

Step 1: Update the User Broadcast

Instead of converting state.user to a string, you should send it as an object. Modify your Register method to send the User object directly as follows:

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

By sending it as an object, SignalR will handle the serialization for you, allowing the client-side to receive it correctly.

Step 2: Verify the Client Side Implementation

On the client side, make sure you are still handling the incoming User object correctly. Here is the relevant code from your Blazor page:

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

This code should work effectively with the changes made on the server side, as it now expects a User object rather than a string.

Step 3: Confirm Print Statements (Optional)

As an optional debugging step, consider logging or debugging your objects on both client and server sides before sending to ensure they are as expected. This can help trace any issues if they arise again.

Conclusion

By sending your User object directly instead of as a string, you can leverage SignalR’s built-in serialization capabilities to effectively communicate between your WebAPI server and Blazor client. These adjustments will make your application's signal sending robust and reliable.

If you run into further issues or have questions, feel free to engage with the community or check more documentation on SignalR and Blazor. Happy coding!