Question

I am just trying to learn .Net RIA Service, so i am creating one hello world example. Now in domainserviceclass i am using code below:

[ServiceOperation]

public string SayHello()
{
    return "Hello RIA World!";
}

It is giving me an error for reference. I have tried to search on the net but i am unable to identify which namespace I am missing.

I know it is a very small problem but I am unable to find anything on this error.

Answer 1

In the PDC09 drop of RIA services (ie. the beta) ServiceOperation was renamed to Invoke.

There’s a document which outlines Breaking Changes from July CTP to PDC 2009

From that document:

ServiceOperation renamed to Invoke
Convention introduced for Invoke
operation

In the PDC bits ServiceOperation
has been renamed to Invoke:
– ServiceOperationAttribute -> InvokeAttribute i.e.
[ServiceOpration] -> [Invoke]
– DomainOperation.ServiceOperation -> DomainOperation.Invoke

Also a Convention has been introduced
for Invoke operations. Any public
method on a Domain Service that is not
a [Query], [Insert], [Update],
[Delete] or [Custom] method and has
only Base Types or collection of Base
Types in this signature will be
treated as a [Invoke].

The Invoke attribute lives in the System.Web.DomainServices namespace in System.Web.DomainServices.dll.