MoreEnumerableAssertCountTSource(IEnumerableTSource, Int32, FuncInt32, Int32, Exception) Method

Asserts that a source sequence contains a given count of elements. A parameter specifies the exception to be thrown.

Definition

Namespace: MoreLinq
Assembly: MoreLinq (in MoreLinq.dll) Version: 4.1.0+0e154ef592f33ce0f6f3d534a9eedee273f0ce72

C#

public static IEnumerable<TSource> AssertCount<TSource>(
	this IEnumerable<TSource> source,
	int count,
	Func<int, int, Exception> errorSelector
)

VB

<ExtensionAttribute>
Public Shared Function AssertCount(Of TSource) ( 
	source As IEnumerable(Of TSource),
	count As Integer,
	errorSelector As Func(Of Integer, Integer, Exception)
) As IEnumerable(Of TSource)

C++

public:
[ExtensionAttribute]
generic<typename TSource>
static IEnumerable<TSource>^ AssertCount(
	IEnumerable<TSource>^ source, 
	int count, 
	Func<int, int, Exception^>^ errorSelector
)

F#

[<ExtensionAttribute>]
static member AssertCount : 
        source : IEnumerable<'TSource> * 
        count : int * 
        errorSelector : Func<int, int, Exception> -> IEnumerable<'TSource>

Parameters

source IEnumerableTSource: Source sequence.
count Int32: Count to assert.
errorSelector FuncInt32, Int32, Exception: Function that receives a comparison (a negative integer if actual count is less than count and a positive integer if actual count is greater than count) and count as arguments and which returns the Exception object to throw.

Type Parameters

TSource: Type of elements in source sequence.

Return Value

IEnumerableTSource
Returns the original sequence as long it is contains the number of elements specified by count. Otherwise it throws the Exception object returned by calling errorSelector.

Usage Note

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).

Remarks

This operator uses deferred execution and streams its results.