CodeDom compiling problem with GroupBy

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I'm trying to compile the following snippet with CodeDom:

C#

var res = from x in q.Rows
group x by x.Product into g
select new 
{
    Product = g.Key,
    TotalPrice = g.Sum(p => p.Price),
    TotalQTY = g.Sum(p => p.QTY)
};

return q.ToList<object>();

With the following references :

C#

compilerparams.ReferencedAssemblies.Add(typeof(object).Assembly.Location); //mscorlib.dll
compilerparams.ReferencedAssemblies.Add(typeof(System.Uri).Assembly.Location); //system.dll
                compilerparams.ReferencedAssemblies.Add(typeof(System.Linq.Enumerable).Assembly.Location);//system.core.dll

But the compiler complains that it can't find GroupBy and ToList extension methods.

Posted 28-Oct-13 8:25am

Mehdi Gholam

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Comments

Sergey Alexandrovich Kryukov 28-Oct-13 15:28pm

Your method of finding assemblies to reference is good, but extension methods syntax is different — where is your "using" clause? This is what can be a problem...
—SA

Mehdi Gholam 28-Oct-13 23:56pm

Embarrassingly you are right I missed the using Sysetm.Ling.

Sergey Alexandrovich Kryukov 29-Oct-13 0:28am

I'm glad my educated guess hit the target; to close the issue, I added a formal "solution". I hope you can accept it now... :-)
—SA

1 solution

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-10-28T18:26:00

Solution 1

Add appropriate "using" clause; unlike other syntactic features of the language, when you can use full type names or alias using, extension methods require "using" clause with the namespace where the extension method is declared.

—SA

Posted 28-Oct-13 18:26pm

Sergey Alexandrovich Kryukov

Comments

Mehdi Gholam 29-Oct-13 1:02am

5'ed thanks

Sergey Alexandrovich Kryukov 29-Oct-13 9:58am

My pleasure. :-)
—SA