Common Notes

LINQ

LINQ enables a more declarative style of coding for C# and Visual Basic. A LINQ query

describes operations on data through a declarative construct instead of an iterative one.

Observable Collection: Observable collections are to Rx what enumerable collections are to
LINQ.

var query =
from assembly in AppDomain.CurrentDomain.GetAssemblies()
from type in assembly.GetTypes()
from method in type.GetMethods()
where method.IsStatic
&& method.ReturnType.GetInterface( "IEnumerable'1" ) != null
orderby method.DeclaringType.Name, method.Name
group method by new { 
Class = method.DeclaringType.Name,

Method = method.Name };

INTO Clause

var developersGroupedByLanguage =
from d in developers
group d by d.Language into developersGrouped
select new {
Language = developersGrouped.Key,
DevelopersCount = developersGrouped.Count()

};

LET Clause

var categoriesByProductsNumberQuery =
from c in categories
join p in products on c.IdCategory equals p.IdCategory
into productsByCategory
let ProductsCount = productsByCategory.Count()
orderby ProductsCount

select new { c.IdCategory, ProductsCount};