How to correct implement a custom report source resolver with instance report source

[Andrey]

I need to implement a custom report resolver that will return an instance report source as the report source. 
The inherited ResolveReport method from ReportSourceResolverBase in CustomReportSourceResolver is called 3 times (with 3 requests sent: client registration, instance creation, document creation) => 3 times a ReportSource instance is created, which is undesirable, since it is necessary that it be created once when you open the ReportViewer. 
Is there some way to implement this behavior?

[Dimitar]

Hello Andrey,

The custom resolver should implement the IReportSourceResolver interface. Its method Resolve() is invoked with the reportSource.report passed as the first argument in order to return the correct server-side ReportSource supposed to be used by the Reporting engine. 

For more information, please see the How to use Custom Report Source Resolver and Custom Report Document Resolver article.

Thank you for using Telerik Reporting!

Regards,
Dimitar
Progress Telerik

[Sami]

Hi:

Im trying to implement this, but the custom resolver is never called:

This is my custom resolver:

 

This is the way that Im trying to call it:

 

 

 

[Dimitar]

Hi Sami,

We discussed this in a separate ticket to also share it with the community,  the problem was that the custom resolver was the fallback resolver of another fallback resolver, and was thus never getting reached.

The solution is to either only use the custom resolver or to add the others as fallbacks:

builder.Services.TryAddSingleton<IReportServiceConfiguration>(sp => new ReportServiceConfiguration
{
    ReportingEngineConfiguration = sp.GetService<IConfiguration>(),
    HostAppId = "Net7BlazorNativeDemo",
    Storage = new FileStorage(),
    ReportSourceResolver = new CustomReportSourceResolver(System.IO.Path.Combine(reportsPath))
});