Use DataSourceRequest and DataSourceResult in a Server Blazor app

The Telerik DataSourceRequest can be passed by reference directly to the service, so you can use it to obtain the needed data as per its contents (needed page, page size, filter, sort, etc.).

The Telerik DataSourceResult object is something that you can use to return such data easily - it is an envelope that contains the needed information.

You can obtain the data through extension methods provided by the Telerik.DataSource package - the .ToDataSourceResult(dataSourceRequest) and .ToDataSourceResultAsync(dataSourceRequest). They can work with collections like List<T>, IEnumerable<T> and IQueriable<T>. You can use IQueriable collections coming from another service (such as EntityFramework) to perform optimized queries - the Telerik methods use LINQ expressions internally so that the framework can resolve them in the most efficient manner.

Tip: In a server-side Blazor application, you do not need to implement these operations yourself. Using an IQueriable<T> collection for the grid Data will let it perform the LINQ query over the collection itself that will be resolved only when needed, so your database service (e.g, EntityFramework) will optimize the query. Using the DataSourceRequest is optional and would be needed if you want to apply additional logic.