CODEWITHSUNDEEP
c#linq
ideafountain
ideafountain

Reputation: 575

Dynamic Linq Groupby SELECT Key, List<T>

I am using Dynamic Linq helper for grouping data. My code is as follows :

Employee[] empList = new Employee[6];
empList[0] = new Employee() { Name = "CA", State = "A", Department = "xyz" };
empList[1] = new Employee() { Name = "ZP", State = "B", Department = "xyz" };
empList[2] = new Employee() { Name = "AC", State = "B", Department = "xyz" };
empList[3] = new Employee() { Name = "AA", State = "A", Department = "xyz" };
empList[4] = new Employee() { Name = "A2", State = "A", Department = "pqr" };
empList[5] = new Employee() { Name = "BA", State = "B", Department = "pqr" };

var empqueryable = empList.AsQueryable();
var dynamiclinqquery  = DynamicQueryable.GroupBy(empqueryable, "new (State, Department)", "it");

How can I get back the Key and corresponding list of grouped items i.e IEnumerable of {Key, List} from dynamiclinqquery ?

Upvotes: 4

Views: 5282

Answers (2)

ideafountain
ideafountain

Reputation: 575

I solved the problem by defining a selector that projects the Key as well as Employees List. 

       var eq = empqueryable.GroupBy("new (State, Department)", "it").Select("new(it.Key as Key, it as Employees)");
       var keyEmplist = (from dynamic dat in eq select dat).ToList();

       foreach (var group in keyEmplist)
       {
           var key = group.Key;
           var elist = group.Employees;

           foreach (var emp in elist)
           {

           }                                          
       }

Upvotes: 8

casperOne
casperOne

Reputation: 74540

The GroupBy method should still return something that implements IEnumerable<IGrouping<TKey, TElement>>.

While you might not be able to actually cast it (I'm assuming it's dynamic), you can certainly still make calls on it, like so:

foreach (var group in dynamiclinqquery)
{
    // Print out the key.
    Console.WriteLine("Key: {0}", group.Key);

    // Write the items.
    foreach (var item in group)
    {
        Console.WriteLine("Item: {0}", item);
    }
}

Upvotes: 0

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