In general, the Standalone Report Designer
works only with XML report definitions (.trdp/x). Converting reports from a class library into TRDP format can be achieved with Import Wizard built in Standalone Designer. Step by step instructions could be found in How to: Import reports created with the VS Report Designer
However, note that event handlers and methods can not be imported. Custom code like properties, events, methods, instantiated data objects will not be serialized
in XML along with the settings of the report.
A possible scenario is creating an user function
for the custom methods and add references into configuration section of the Standalone Designer. More details can be found in Extending Report Designer
help article. After that, you'll have to configure Telerik Report Server to use reports with custom functions
If you face further issues, we would need the problematic report and the DLL of the user function, so we can test it locally.
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