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GetList(context) might return an object backed by a custom LINQ provider (like an Entity Framework collection), then you probably want to leave the data cast as an IQueryable: even though your benchmark shows it being 20 times faster to use a list, that difference is so small that no user is ever going to be able to ...
The simple answer is that unless you add the record to the underlying datastore that the Iqueryable is querying, you can't add a new record into an IQueryable. So if you are using LinqToSql then you would have to add a row into the table that the IQueryable was querying in order to "add" a row into the IQueryable.
var list4 = list1. Union(list2); Union is a set operation - it returns distinct values. Concat simply returns the items from the first sequence followed by the items from the second sequence; the resulting sequence can include duplicate items.
IQueryable is executed. // // Returns: // A System.Type that represents the type of the element(s) that are returned when. // the expression tree associated with this object is executed.
var list = new List<string>();
var queryable = list.AsQueryable();
Add a reference to: System.Linq
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