AsyncEnumerable.AggregateBy 方法

定义

命名空间:: System.Linq

程序集:: System.Linq.AsyncEnumerable.dll

包:: System.Linq.AsyncEnumerable v11.0.0-preview.4.26230.115

重要

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重载

名称	说明
AggregateBy<TSource,TKey,TAccumulate>(IAsyncEnumerable<TSource>, Func<TSource,TKey>, Func<TKey,TAccumulate>, Func<TAccumulate, TSource,TAccumulate>, IEqualityComparer<TKey>)	对序列应用累加器函数，按键对结果进行分组。
AggregateBy<TSource,TKey,TAccumulate>(IAsyncEnumerable<TSource>, Func<TSource,TKey>, TAccumulate, Func<TAccumulate,TSource,TAccumulate>, IEqualityComparer<TKey>)	对序列应用累加器函数，按键对结果进行分组。
AggregateBy<TSource,TKey,TAccumulate>(IAsyncEnumerable<TSource>, Func<TSource,CancellationToken,ValueTask<TKey>>, Func<TKey,CancellationToken, ValueTask<TAccumulate>>, Func<TAccumulate,TSource,CancellationToken, ValueTask<TAccumulate>>, IEqualityComparer<TKey>)	对序列应用累加器函数，按键对结果进行分组。
AggregateBy<TSource,TKey,TAccumulate>(IAsyncEnumerable<TSource>, Func<TSource,CancellationToken,ValueTask<TKey>>, TAccumulate, Func<TAccumulate,TSource,CancellationToken,ValueTask<TAccumulate>>, IEqualityComparer<TKey>)	对序列应用累加器函数，按键对结果进行分组。

AggregateBy<TSource,TKey,TAccumulate>(IAsyncEnumerable<TSource>, Func<TSource,TKey>, Func<TKey,TAccumulate>, Func<TAccumulate, TSource,TAccumulate>, IEqualityComparer<TKey>)

Source:: AggregateBy.cs

Source:: AggregateBy.cs

Source:: AggregateBy.cs

对序列应用累加器函数，按键对结果进行分组。

public static System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<TKey,TAccumulate>> AggregateBy<TSource,TKey,TAccumulate>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, Func<TSource,TKey> keySelector, Func<TKey,TAccumulate> seedSelector, Func<TAccumulate,TSource,TAccumulate> func, System.Collections.Generic.IEqualityComparer<TKey>? keyComparer = default);

static member AggregateBy : System.Collections.Generic.IAsyncEnumerable<'Source> * Func<'Source, 'Key> * Func<'Key, 'Accumulate> * Func<'Accumulate, 'Source, 'Accumulate> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<'Key, 'Accumulate>>

<Extension()>
Public Function AggregateBy(Of TSource, TKey, TAccumulate) (source As IAsyncEnumerable(Of TSource), keySelector As Func(Of TSource, TKey), seedSelector As Func(Of TKey, TAccumulate), func As Func(Of TAccumulate, TSource, TAccumulate), Optional keyComparer As IEqualityComparer(Of TKey) = Nothing) As IAsyncEnumerable(Of KeyValuePair(Of TKey, TAccumulate))

类型参数

TSource

的元素 source的类型。

TKey

返回 keySelector的键的类型。

TAccumulate

累加器值的类型。

参数

source: IAsyncEnumerable<TSource>

要聚合的集合 IAsyncEnumerable<T> 。

keySelector: Func<TSource,TKey>

用于提取每个元素的键的函数。

seedSelector: Func<TKey,TAccumulate>

初始累加器值的工厂。

func: Func<TAccumulate,TSource,TAccumulate>

要在每个元素上调用的累加器函数。

keyComparer: IEqualityComparer<TKey>

与键进行比较的一个 IEqualityComparer<T> 。

IAsyncEnumerable<KeyValuePair<TKey,TAccumulate>>

一个枚举，包含与派生自 source的每个键对应的聚合。

例外

ArgumentNullException

func 是 null。

注解

此方法与 GroupBy 方法相当，其中每个分组都聚合为单个值，而不是为每个组分配集合。

适用于

AggregateBy<TSource,TKey,TAccumulate>(IAsyncEnumerable<TSource>, Func<TSource,TKey>, TAccumulate, Func<TAccumulate,TSource,TAccumulate>, IEqualityComparer<TKey>)

Source:: AggregateBy.cs

Source:: AggregateBy.cs

Source:: AggregateBy.cs

对序列应用累加器函数，按键对结果进行分组。

public static System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<TKey,TAccumulate>> AggregateBy<TSource,TKey,TAccumulate>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, Func<TSource,TKey> keySelector, TAccumulate seed, Func<TAccumulate,TSource,TAccumulate> func, System.Collections.Generic.IEqualityComparer<TKey>? keyComparer = default);

static member AggregateBy : System.Collections.Generic.IAsyncEnumerable<'Source> * Func<'Source, 'Key> * 'Accumulate * Func<'Accumulate, 'Source, 'Accumulate> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<'Key, 'Accumulate>>

<Extension()>
Public Function AggregateBy(Of TSource, TKey, TAccumulate) (source As IAsyncEnumerable(Of TSource), keySelector As Func(Of TSource, TKey), seed As TAccumulate, func As Func(Of TAccumulate, TSource, TAccumulate), Optional keyComparer As IEqualityComparer(Of TKey) = Nothing) As IAsyncEnumerable(Of KeyValuePair(Of TKey, TAccumulate))

类型参数

TSource

的元素 source的类型。

TKey

返回 keySelector的键的类型。

TAccumulate

累加器值的类型。

参数

source: IAsyncEnumerable<TSource>

要聚合的集合 IAsyncEnumerable<T> 。

keySelector: Func<TSource,TKey>

用于提取每个元素的键的函数。

seed: TAccumulate

初始累加器值。

func: Func<TAccumulate,TSource,TAccumulate>

要在每个元素上调用的累加器函数。

keyComparer: IEqualityComparer<TKey>

与键进行比较的一个 IEqualityComparer<T> 。

IAsyncEnumerable<KeyValuePair<TKey,TAccumulate>>

一个枚举，包含与派生自 source的每个键对应的聚合。

例外

ArgumentNullException

func 是 null。

注解

此方法与 GroupBy 方法相当，其中每个分组都聚合为单个值，而不是为每个组分配集合。

适用于

AggregateBy<TSource,TKey,TAccumulate>(IAsyncEnumerable<TSource>, Func<TSource,CancellationToken,ValueTask<TKey>>, Func<TKey,CancellationToken, ValueTask<TAccumulate>>, Func<TAccumulate,TSource,CancellationToken, ValueTask<TAccumulate>>, IEqualityComparer<TKey>)

Source:: AggregateBy.cs

Source:: AggregateBy.cs

Source:: AggregateBy.cs

对序列应用累加器函数，按键对结果进行分组。

public static System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<TKey,TAccumulate>> AggregateBy<TSource,TKey,TAccumulate>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, Func<TSource,System.Threading.CancellationToken,System.Threading.Tasks.ValueTask<TKey>> keySelector, Func<TKey,System.Threading.CancellationToken,System.Threading.Tasks.ValueTask<TAccumulate>> seedSelector, Func<TAccumulate,TSource,System.Threading.CancellationToken,System.Threading.Tasks.ValueTask<TAccumulate>> func, System.Collections.Generic.IEqualityComparer<TKey>? keyComparer = default);

static member AggregateBy : System.Collections.Generic.IAsyncEnumerable<'Source> * Func<'Source, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<'Key>> * Func<'Key, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<'Accumulate>> * Func<'Accumulate, 'Source, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<'Accumulate>> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<'Key, 'Accumulate>>

<Extension()>
Public Function AggregateBy(Of TSource, TKey, TAccumulate) (source As IAsyncEnumerable(Of TSource), keySelector As Func(Of TSource, CancellationToken, ValueTask(Of TKey)), seedSelector As Func(Of TKey, CancellationToken, ValueTask(Of TAccumulate)), func As Func(Of TAccumulate, TSource, CancellationToken, ValueTask(Of TAccumulate)), Optional keyComparer As IEqualityComparer(Of TKey) = Nothing) As IAsyncEnumerable(Of KeyValuePair(Of TKey, TAccumulate))

类型参数

TSource

的元素 source的类型。

TKey

返回 keySelector的键的类型。

TAccumulate

累加器值的类型。

参数

source: IAsyncEnumerable<TSource>

要聚合的集合 IAsyncEnumerable<T> 。

keySelector: Func<TSource,CancellationToken,ValueTask<TKey>>

用于提取每个元素的键的函数。

seedSelector: Func<TKey,CancellationToken,ValueTask<TAccumulate>>

初始累加器值的工厂。

func: Func<TAccumulate,TSource,CancellationToken,ValueTask<TAccumulate>>

要在每个元素上调用的累加器函数。

keyComparer: IEqualityComparer<TKey>

与键进行比较的一个 IEqualityComparer<T> 。

IAsyncEnumerable<KeyValuePair<TKey,TAccumulate>>

一个枚举，包含与派生自 source的每个键对应的聚合。

例外

ArgumentNullException

func 是 null。

注解

此方法与 GroupBy 方法相当，其中每个分组都聚合为单个值，而不是为每个组分配集合。

适用于

AggregateBy<TSource,TKey,TAccumulate>(IAsyncEnumerable<TSource>, Func<TSource,CancellationToken,ValueTask<TKey>>, TAccumulate, Func<TAccumulate,TSource,CancellationToken,ValueTask<TAccumulate>>, IEqualityComparer<TKey>)

Source:: AggregateBy.cs

Source:: AggregateBy.cs

Source:: AggregateBy.cs

对序列应用累加器函数，按键对结果进行分组。

public static System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<TKey,TAccumulate>> AggregateBy<TSource,TKey,TAccumulate>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, Func<TSource,System.Threading.CancellationToken,System.Threading.Tasks.ValueTask<TKey>> keySelector, TAccumulate seed, Func<TAccumulate,TSource,System.Threading.CancellationToken,System.Threading.Tasks.ValueTask<TAccumulate>> func, System.Collections.Generic.IEqualityComparer<TKey>? keyComparer = default);

static member AggregateBy : System.Collections.Generic.IAsyncEnumerable<'Source> * Func<'Source, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<'Key>> * 'Accumulate * Func<'Accumulate, 'Source, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<'Accumulate>> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<'Key, 'Accumulate>>

<Extension()>
Public Function AggregateBy(Of TSource, TKey, TAccumulate) (source As IAsyncEnumerable(Of TSource), keySelector As Func(Of TSource, CancellationToken, ValueTask(Of TKey)), seed As TAccumulate, func As Func(Of TAccumulate, TSource, CancellationToken, ValueTask(Of TAccumulate)), Optional keyComparer As IEqualityComparer(Of TKey) = Nothing) As IAsyncEnumerable(Of KeyValuePair(Of TKey, TAccumulate))

类型参数

TSource

的元素 source的类型。

TKey

返回 keySelector的键的类型。

TAccumulate

累加器值的类型。

参数

source: IAsyncEnumerable<TSource>

要聚合的集合 IAsyncEnumerable<T> 。

keySelector: Func<TSource,CancellationToken,ValueTask<TKey>>

用于提取每个元素的键的函数。

seed: TAccumulate

初始累加器值。

func: Func<TAccumulate,TSource,CancellationToken,ValueTask<TAccumulate>>

要在每个元素上调用的累加器函数。

keyComparer: IEqualityComparer<TKey>

与键进行比较的一个 IEqualityComparer<T> 。

IAsyncEnumerable<KeyValuePair<TKey,TAccumulate>>

一个枚举，包含与派生自 source的每个键对应的聚合。

例外

ArgumentNullException

func 是 null。

注解

此方法与 GroupBy 方法相当，其中每个分组都聚合为单个值，而不是为每个组分配集合。

适用于

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