WCF和错误存储过程

Question

I have a stored procedure which returns the status of databasemail in SQL Server, which return string "stopped" or "started". I must use it in C#, Silverlight and WCF Data Service.

Here's my code:

contex.BeginExecute<String>(new Uri(uri2), OnQueryComplete3, null);
...
private void OnQueryComplete3(IAsyncResult result)
{
   grLog.ItemsSource = contex.EndExecute<String>(result).ToList<String>();
}

And I have error:

Error processing response stream. The XML element contains mixed content.

The service operation:

[WebGet]
public IQueryable<String> Status_Serwer()
{
return CurrentDataSource
.status_serwer()
.AsQueryable();
}

I find ".NET 4.0 still doesn't support materialization of responses from service operations returning primitive or complex types (or collections of those)." in this duscussion http://go4answers.webhost4life.com/Example/incoking-webget-throws-exception-56000.aspx . Is it true?

Answer 1

IQueryable is normaly used for a list that hasn't been executed yet, and requires interactive iteration. Because you are pulling your data together on the server it may be better to pull the entire list of status records and then send them to your client. Try using a List instead of IQueryable in your response. Note that List is serializable.

Assuming that "CurrentDataSource.status_serwer()" returns an enumerable list of strings, this code might do the trick:

[WebGet]
public List<String> Status_Serwer()
{
    return CurrentDataSource
          .status_serwer()
          .ToList();
}