Quantifier Operators return the Boolean value (either True or false) if some or all the elements in a sequence satisfy a condition,

Mainly two Quantifiers in linq:

Any

All

Examples (vb)

"Any" to determine if any of the words in the array contain the substring

Public Sub ExampleAny()

Dim words() = {"believe", "relief", "receipt", "field"}

Dim iAfterE = words.Any(Function(w) w.Contains("ei"))

Console.WriteLine("There is a word that contains in the

list that contains 'ei': {0}", iAfterE)

End Sub

Result:

There is a word that contains in the list that contains 'ei': True

"All" to return a grouped a list of products only for categories that have all of their products in stock

Public Sub Quantifier_All_Exam()

Dim products = GetProductList()

Dim productGroups = From p In products _

Group p By p.Category Into Group _

Where (Group.All(Function(p) p.UnitsInStock > 0)) _

Select Category, ProductGroup = Group

ObjectDumper.Write(productGroups, 1)

End Sub