accessing data in dynamic Linq

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Hi,
I am working on a complex function of multiple groupby using LINQ dynamically.
i have a query like :

C#

var groupByData = dataCollection.AsQueryable().GroupBy(strGroupby.ToString(),"it")
.select(strdata.ToString());

i want to access data through the collection that i have as "groupByData", but i am unable to do so.
When i found out in the quick watch all the values that i have found are the required correct values, going through quickwatch i found out something as...

system.linq.systemcore_enumerabledebugview<dynamicclass2>(groupByData).items[0]..... but it gives me an error when i tried this in my code.
How can i access the data i have in collection , it is of IQueryable return Type.

Thanks a lot in advance.

Nishant

Posted 7-Mar-13 22:47pm

Nishant Patriker

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Andreas Gieriet · Answer 1 · 2013-03-10T04:56:00

You seem to not understand delegates and lambda expressions.
A Linq expression based on the Enumerable extension methods as GroupBy etc. take delegates, usually in the form of lambda expressions.

E.g. the function Select is defined as described in Enumerable.Select(...)[^]. It takes a delegate that takes a source item and returns the result item.

E.g.

C#

static int Square(int i) { return i * i; }

static void Main(string[] args)
{
    var list = new List<int>() { 1, 2, 3 };
    Console.WriteLine(string.Join(", ", list.Select(Square))); // delegate as function reference
    Console.WriteLine(string.Join(", ", list.Select(i=>i*i))); // delegate as lambda expression
}

I don't know what your data are, but I guess you want to express something like:

C#

var groupByData = dataCollection.GroupBy(e=>e.it);

No ToString(). No clue why you want to convert to string...

Cheers
Andi