ParallelEnumerable.LongCount 方法

定义

返回一个 Int64,表示并行序列中的元素的总数。Returns an Int64 that represents the total number of elements in a parallel sequence.

重载

LongCount<TSource>(ParallelQuery<TSource>)

返回一个 Int64,表示并行序列中的元素的总数。Returns an Int64 that represents the total number of elements in a parallel sequence.

LongCount<TSource>(ParallelQuery<TSource>, Func<TSource,Boolean>)

返回一个 Int64,表示并行序列中满足条件的元素的数量。Returns an Int64 that represents how many elements in a parallel sequence satisfy a condition.

LongCount<TSource>(ParallelQuery<TSource>)

返回一个 Int64,表示并行序列中的元素的总数。Returns an Int64 that represents the total number of elements in a parallel sequence.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static long LongCount(System::Linq::ParallelQuery<TSource> ^ source);
public static long LongCount<TSource> (this System.Linq.ParallelQuery<TSource> source);
static member LongCount : System.Linq.ParallelQuery<'Source> -> int64
<Extension()>
Public Function LongCount(Of TSource) (source As ParallelQuery(Of TSource)) As Long

类型参数

TSource

source 的元素类型。The type of the elements of source.

参数

source
ParallelQuery<TSource>

包含要计数的元素的序列。A sequence that contains elements to be counted.

返回

输入序列中的元素数量。The number of elements in the input sequence.

异常

已使用通过 WithCancellation 传递的令牌取消了查询。The query was canceled with the token passed in through WithCancellation.

source 为 null 引用(在 Visual Basic 中为 Nothing)。source is a null reference (Nothing in Visual Basic).

源中的元素数大于 MaxValueThe number of elements in source is larger than MaxValue. 或评估查询期间发生一个或多个异常。-or- One or more exceptions occurred during the evaluation of the query.

计算结果大于 MaxValueThe computed result is greater than MaxValue.

另请参阅

LongCount<TSource>(ParallelQuery<TSource>, Func<TSource,Boolean>)

返回一个 Int64,表示并行序列中满足条件的元素的数量。Returns an Int64 that represents how many elements in a parallel sequence satisfy a condition.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static long LongCount(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, bool> ^ predicate);
public static long LongCount<TSource> (this System.Linq.ParallelQuery<TSource> source, Func<TSource,bool> predicate);
static member LongCount : System.Linq.ParallelQuery<'Source> * Func<'Source, bool> -> int64
<Extension()>
Public Function LongCount(Of TSource) (source As ParallelQuery(Of TSource), predicate As Func(Of TSource, Boolean)) As Long

类型参数

TSource

source 的元素类型。The type of the elements of source.

参数

source
ParallelQuery<TSource>

包含要计数的元素的序列。A sequence that contains elements to be counted.

predicate
Func<TSource,Boolean>

用于测试每个元素是否满足条件的函数。A function to test each element for a condition.

返回

一个数字,表示序列中满足谓词函数条件的元素数量。A number that represents how many elements in the sequence satisfy the condition in the predicate function.

异常

已使用通过 WithCancellation 传递的令牌取消了查询。The query was canceled with the token passed in through WithCancellation.

sourcepredicate 为 null 引用(在 Visual Basic 中为 Nothing)。source or predicate is a null reference (Nothing in Visual Basic).

源中的元素数大于 MaxValueThe number of elements in source is larger than MaxValue. 或评估查询期间发生一个或多个异常。-or- One or more exceptions occurred during the evaluation of the query.

计算结果大于 MaxValueThe computed result is greater than MaxValue.

另请参阅

适用于