OData and ApiKey url-parameter through ServiceReference

ApiKey is used to control the usage and it is affixed as an url parameter (开发者_运维百科implemented using somewhat modified version of this solution). Question is, how to go about appending this parameter when consuming the API through the use of the ServiceReference in Visual Studio?

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It seems to work just fine if you use the full URL to the $metadata in the Add Service Reference dialog in VS. So for example http://services.odata.org/OData/OData.svc/$metadata?apiKey=1234 works, and it does send the query string as specified.

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I've found the answer on social.msdn.com. Basically, you need to use the AddQueryOption method of a resource proxy, like:

SomeService.SomeResource.AddQueryOption("apikey", "1234")