MoreEnumerable.PadStart<TSource>(IEnumerable<TSource>, Int32, Func<Int32, 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: 3.4.0+b99a6a8cc504caf2d48372fe54a2f8116c59cd0c
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 IEnumerable<TSource>
- The sequence to pad.
- width Int32
- The width/length below which to pad.
- paddingSelector Func<Int32, TSource>
-
Function to calculate padding given the index of the missing element.
- TSource
- The type of the elements of source.
IEnumerable<TSource>
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
IEnumerable<TSource>. 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 }.