Скачать или смотреть Resolving the System.Text.Json.JsonSerializer Exception in Xamarin iOS with Refit

Discover effective solutions to fix the `System.Text.Json.JsonSerializer` exception in Xamarin.iOS when using Refit for API calls.
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This video is based on the question https://stackoverflow.com/q/69776438/ asked by the user 'Timothy Belvin' ( https://stackoverflow.com/u/5344507/ ) and on the answer https://stackoverflow.com/a/69792063/ provided by the user 'Wen xu Li' ( https://stackoverflow.com/u/16304044/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

Are you facing the frustrating System.Text.Json.JsonSerializer exception while working on your Xamarin Forms project, specifically on iOS? It’s a common headache that many developers encounter when their code runs smoothly on Android but falters on iOS. This guide dives into the specifics of the problem you may be facing, particularly when using Refit for making API calls. We will also provide you with a straightforward solution to resolve this issue.

The Issue at Hand

In your Xamarin project, particularly when dealing with API calls using Refit, you may run into an exception that reads:

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This exception can be puzzling, especially since your code may work perfectly fine on Android. The issue arises when you're utilizing the System.Text.Json library on iOS. Let's break down the components leading to this error so you can better understand what’s happening.

Contextual Breakdown

1. Your Configuration

You have set up your services in the Startup.cs class using:

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These lines show how you configure your Refit client to handle HTTP requests using Dependency Injection (DI).

2. Your API Interface

Your IAuthorizeApi interface effectively sets up the necessary parameters for the API endpoint you are trying to hit.

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3. Error Point

Here, you've indicated that the call to the Login method throws the exception:

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4. Entity Response

Your AuthResponse class provides the necessary structure to capture the API result, which utilizes the AliasAs attribute to map JSON properties.

A Simple Solution

The good news is that resolving this issue involves a straightforward addition to your iOS project. Here are the steps to follow:

Step 1: Modify the iOS .csproj File

To resolve the exception, you need to add specific package references to your iOS project. You can do this by editing your .csproj file to include the following code:

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Step 2: Rebuild Your Project

After adding the above package references, make sure to clean and rebuild your project. This will help to ensure that any changes you’ve made take effect.

Conclusion

By following the above steps, you should be able to resolve the System.Text.Json.JsonSerializer exception in your Xamarin.iOS application when using Refit for API calls. Remember, this issue is typically isolated to iOS, so keeping an eye on compatibility with packages is essential when developing cross-platform applications. Hopefully, this solution helps you continue your development journey without further interruptions.

If you have any additional questions or run into other challenges, feel free to reach out in the comments below!