MoreEnumerableChooseT, TResult Method
Applies a function to each element of the source sequence and
returns a new sequence of result elements for source elements
where the function returns a couple (2-tuple) having a true
as its first element and result as the second.
Namespace: MoreLinqAssembly: MoreLinq (in MoreLinq.dll) Version: 4.4.0+6d97c3b1d482f98300f4446df14742b0e3fafbec
public static IEnumerable<TResult> Choose<T, TResult>(
this IEnumerable<T> source,
Func<T, (bool , TResult )> chooser
)
<ExtensionAttribute>
Public Shared Function Choose(Of T, TResult) (
source As IEnumerable(Of T),
chooser As Func(Of T, ( As Boolean, As TResult))
) As IEnumerable(Of TResult)
public:
[ExtensionAttribute]
generic<typename T, typename TResult>
static IEnumerable<TResult>^ Choose(
IEnumerable<T>^ source,
Func<T, ValueTuple<bool, TResult>>^ chooser
)
[<ExtensionAttribute>]
static member Choose :
source : IEnumerable<'T> *
chooser : Func<'T, ValueTuple<bool, 'TResult>> -> IEnumerable<'TResult>
- source IEnumerableT
- The source sequence.
- chooser FuncT, ValueTupleBoolean, TResult
- The function that is applied to each source
element.
- T
-
The type of the elements in source.
- TResult
-
The type of the elements in the returned sequence.
IEnumerableTResultA sequence
TResult elements.In Visual Basic and C#, you can call this method as an instance method on any object of type
IEnumerableT. When you use instance method syntax to call this method, omit the first parameter. For more information, see
Extension Methods (Visual Basic) or
Extension Methods (C# Programming Guide).
This method uses deferred execution semantics and streams its
results.
var str = "O,l,2,3,4,S,6,7,B,9";
var xs = str.Split(',').Choose(s => (int.TryParse(s, out var n), n));
The
xs variable will be a sequence of the integers 2, 3, 4,
6, 7 and 9.