MoreEnumerablePadStartTSource(IEnumerableTSource, Int32, FuncInt32, TSource) Method
Pads a sequence with a dynamic filler value in the beginning if it is narrower (shorter
in length) than a given width.
An additional parameter specifies the function to calculate padding.
Namespace: MoreLinqAssembly: MoreLinq (in MoreLinq.dll) Version: 4.4.0+6d97c3b1d482f98300f4446df14742b0e3fafbec
public static IEnumerable<TSource> PadStart<TSource>(
this IEnumerable<TSource> source,
int width,
Func<int, TSource> paddingSelector
)
<ExtensionAttribute>
Public Shared Function PadStart(Of TSource) (
source As IEnumerable(Of TSource),
width As Integer,
paddingSelector As Func(Of Integer, TSource)
) As IEnumerable(Of TSource)
public:
[ExtensionAttribute]
generic<typename TSource>
static IEnumerable<TSource>^ PadStart(
IEnumerable<TSource>^ source,
int width,
Func<int, TSource>^ paddingSelector
)
[<ExtensionAttribute>]
static member PadStart :
source : IEnumerable<'TSource> *
width : int *
paddingSelector : Func<int, 'TSource> -> IEnumerable<'TSource>
- source IEnumerableTSource
- The sequence to pad.
- width Int32
- The width/length below which to pad.
- paddingSelector FuncInt32, TSource
-
Function to calculate padding given the index of the missing element.
- TSource
- The type of the elements of source.
IEnumerableTSource
Returns a sequence that is at least as wide/long as the width/length
specified by the
width parameter.
In Visual Basic and C#, you can call this method as an instance method on any object of type
IEnumerableTSource. 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 operator uses deferred execution and streams its results.
int[] numbers = { 123, 456, 789 };
var result = numbers.PadStart(6, i => -i);
The
result variable will contain
{ 0, -1, -2, 123, 456, 789 }.