Type mismatch in Query

Question

Another question is: What is wrong with the following query? The compile time error that comes up is:

1.       Instance argument: cannot convert from 'Microsoft.ComplexEventProcessing.Linq.CepStream<double>' to 'Microsoft.ComplexEventProcessing.Linq.CepStream<MarloweStreamInsight.MarloweImplicitServer.InputType>'

2.       'Microsoft.ComplexEventProcessing.Linq.CepStream<double>' does not contain a definition for 'ToQuery' and the best extension method overload 'Microsoft.ComplexEventProcessing.Linq.CepStream.ToQuery<T>(Microsoft.ComplexEventProcessing.Linq.CepStream<T>, Microsoft.ComplexEventProcessing.Linq.CepStreamConsumer<T>)' has some invalid arguments

 

I know that windows.SValue is of type double and ToQuery takes generic InputType. What can be done to circumvent this?

 

 

 

                var top =  from windows in inputDataStream

                            where windows.Type == "CPU" && windows.SValue > 10

                            select windows.SValue;

 

               

               

 

                // Create query from the LINQ statement and feed it into the

                // consumer

                //Query query = top.ToQuery<InputType>(streamConsumer);

                Query query = top.ToQuery<InputType>(streamConsumer);

                consoleTracer.WriteLine("Start query");

 Sorry if my question sounds basic, I am working towards a deadline and I am new to StreamInsight.

Answer 1

Sid,
You can't select the field "SValue" directly. You can just output the events that passed the filer themselves ("... select windows") or create a type with a single field ("... select new { windows.SValue }"). However, this depends on the type that the output adapter expects. How do you construct the streamConsumer?
Regards,
Roman

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MS StreamInsight Team

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