To make a custom calculated property, you need to inherit from the type Telerik.Sitefinity.Web.Services.Extensibility.CalculatedProperty. This is an abstract class and implements the following mandatory methods:
NOTE: When specifying the return type, the type must be either registered in the Types available in the service or must be decorated with a DataContract attribute.
Sitefinity has one OOB CalculatedProperties: MediaUrlCalculatedProperty.
The MediaUrlCalculatedProperty can be configured with the following parameters – absolute and thumbnail. This specifies whether to generate an absolute URL for the property and the type of the thumbnail to return respectively.
The following example is a custom calculated property for getting the provider name of an item:
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