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Only a single enumeration is supported by this IEnumerable.

Posted By:      Posted Date: September 08, 2010    Points: 0   Category :WCF
I've only seen a few other posts on the internet about this error message, and none of them seem to give an answer that's relevant to Silverlight asynchronous code. I have a data service operation, I call it from a Silverlight client. I know the service operation is returning the desired data, because I have tested the code in a synchronous aspx page load and browsed it with the debugger. However, whether I have the service operation method return an IQueryable or an IEnumerable, I can't iterate through the results in the Silverlight client code - I receive the error in the title of this post. I can't do a foreach, I can't do a for loop, I can't do a ToList, they all give that error. private void on_oppquery(IAsyncResult result) { /*Use dispatcher to ensure that the asynch call returns in the correct thread*/ Dispatcher.BeginInvoke(() => { IEnumerable<opportunity> response = null; try { /*Since this is the first page, we get back the query*/ var query = result.AsyncState as DataContext; /*Get the response of the query*/ response = query.EndExecute<opportunity>(result); /*Enumeration executes the query*/ //THIS BREAKS //response.ToList<opportunity>(); //THIS BREAKS //foreach (opportunity o

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