Use DataSourceRequest and DataSourceResult and WebAPI in a WebAssembly Blazor app with custom serialization

Telerik supports serialization of the DataSourceRequest object through the native Blazor System.Text.Json serializer only. In your app you may be using different serialization techniques, with Newtonsoft.Json being a common tool used to serialize data.

Microsoft have indicated that the path forward will be through System.Text.Json only, so you may want to consider moving towards it. You can read more about it in the announcement blog https://devblogs.microsoft.com/dotnet/try-the-new-system-text-json-apis/. In the folder above there is an example of using it.

For such specific scenarios, you must ensure that the serialization and deserialization processes work as expected - all the data is present, correct, strongly typed, and there are no errors. This applies to both the controller action, and the Blazor app itself.

The Telerik components cannot influence the serialization and deserialization process and transferring data between the endpoints is up to the application.

This example shows a sample of a custom converter that lets Newtonsoft handle the filter interface present in the DataSourceRequest object. You can use it as base for further implementation of other similar scenarios and more cases.

The custom converter is in the Converters folder of the Server project, and is provided to the Newtonsoft service in the Startup.cs file of the Server project.