ParallelEnumerable.ToDictionary 方法
定义
从 Dictionary<TKey,TValue> 创建一个 ParallelQuery<TSource>。Creates a Dictionary<TKey,TValue> from a ParallelQuery<TSource>.
重载
ToDictionary<TSource,TKey,TElement>(ParallelQuery<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)
根据指定的键选择器和元素选择器函数，从 Dictionary<TKey,TValue> 创建一个 ParallelQuery<TSource>。Creates a Dictionary<TKey,TValue> from a ParallelQuery<TSource> according to specified key selector and element selector functions.
public:
generic <typename TSource, typename TKey, typename TElement>
[System::Runtime::CompilerServices::Extension]
static System::Collections::Generic::Dictionary<TKey, TElement> ^ ToDictionary(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, TKey> ^ keySelector, Func<TSource, TElement> ^ elementSelector);public static System.Collections.Generic.Dictionary<TKey,TElement> ToDictionary<TSource,TKey,TElement> (this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector);static member ToDictionary : System.Linq.ParallelQuery<'Source> * Func<'Source, 'Key> * Func<'Source, 'Element> -> System.Collections.Generic.Dictionary<'Key, 'Element><Extension()>
Public Function ToDictionary(Of TSource, TKey, TElement) (source As ParallelQuery(Of TSource), keySelector As Func(Of TSource, TKey), elementSelector As Func(Of TSource, TElement)) As Dictionary(Of TKey, TElement)类型参数
- TSource
source 的元素类型。The type of the elements of source.
- TKey
keySelector 返回的键的类型。The type of the key returned by keySelector.
- TElement
elementSelector 返回的值的类型。The type of the value returned by elementSelector.
参数
- source
- ParallelQuery<TSource>
据其创建 Dictionary<TKey,TValue> 的序列。A sequence to create a Dictionary<TKey,TValue> from.
- keySelector
- Func<TSource,TKey>
用于从每个元素中提取键的函数。A function to extract a key from each element.
- elementSelector
- Func<TSource,TElement>
用于从每个元素产生结果元素值的转换函数。A transform function to produce a result element value from each element.
返回
- Dictionary<TKey,TElement>
一个 Dictionary<TKey,TValue>，包含从输入序列中选择的类型为 TElement 的值。A Dictionary<TKey,TValue> that contains values of type TElement selected from the input sequence
例外
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 或 keySelector 或 elementSelector 是 null 引用（在 Visual Basic 中为 Nothing）。source or keySelector or elementSelector is a null reference (Nothing in Visual Basic).
keySelector 生成一个为 null 引用的键（在 Visual Basic 中为 Nothing）。keySelector produces a key that is a null reference (Nothing in Visual Basic). - 或 - keySelector 为两个元素产生了重复键。-or- keySelector produces duplicate keys for two elements. 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.
另请参阅
适用于
ToDictionary<TSource,TKey,TElement>(ParallelQuery<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)
根据指定的键选择器函数、比较器和元素选择器函数，从 Dictionary<TKey,TValue> 创建一个 ParallelQuery<TSource>。Creates a Dictionary<TKey,TValue> from a ParallelQuery<TSource> according to a specified key selector function, a comparer, and an element selector function.
public:
generic <typename TSource, typename TKey, typename TElement>
[System::Runtime::CompilerServices::Extension]
static System::Collections::Generic::Dictionary<TKey, TElement> ^ ToDictionary(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, TKey> ^ keySelector, Func<TSource, TElement> ^ elementSelector, System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);public static System.Collections.Generic.Dictionary<TKey,TElement> ToDictionary<TSource,TKey,TElement> (this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer);public static System.Collections.Generic.Dictionary<TKey,TElement> ToDictionary<TSource,TKey,TElement> (this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer);static member ToDictionary : System.Linq.ParallelQuery<'Source> * Func<'Source, 'Key> * Func<'Source, 'Element> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Generic.Dictionary<'Key, 'Element><Extension()>
Public Function ToDictionary(Of TSource, TKey, TElement) (source As ParallelQuery(Of TSource), keySelector As Func(Of TSource, TKey), elementSelector As Func(Of TSource, TElement), comparer As IEqualityComparer(Of TKey)) As Dictionary(Of TKey, TElement)类型参数
- TSource
source 的元素类型。The type of the elements of source.
- TKey
keySelector 返回的键的类型。The type of the key returned by keySelector.
- TElement
elementSelector 返回的值的类型。The type of the value returned by elementSelector.
参数
- source
- ParallelQuery<TSource>
据其创建 Dictionary<TKey,TValue> 的序列。A sequence to create a Dictionary<TKey,TValue> from.
- keySelector
- Func<TSource,TKey>
用于从每个元素中提取键的函数。A function to extract a key from each element.
- elementSelector
- Func<TSource,TElement>
用于从每个元素产生结果元素值的转换函数。A transform function to produce a result element value from each element.
- comparer
- IEqualityComparer<TKey>
用于比较键的 IEqualityComparer<T>。An IEqualityComparer<T> to compare keys.
返回
- Dictionary<TKey,TElement>
一个 Dictionary<TKey,TValue>，包含从输入序列中选择的类型为 TElement 的值。A Dictionary<TKey,TValue> that contains values of type TElement selected from the input sequence
例外
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 或 keySelector 或 elementSelector 是 null 引用（在 Visual Basic 中为 Nothing）。source or keySelector or elementSelector is a null reference (Nothing in Visual Basic).
keySelector 生成一个为 null 引用的键（在 Visual Basic 中为 Nothing）。keySelector produces a key that is a null reference (Nothing in Visual Basic). - 或 - keySelector 为两个元素产生了重复键。-or- keySelector produces duplicate keys for two elements. 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.
另请参阅
适用于
ToDictionary<TSource,TKey>(ParallelQuery<TSource>, Func<TSource,TKey>)
根据指定的键选择器函数，从 Dictionary<TKey,TValue> 创建一个 ParallelQuery<TSource>。Creates a Dictionary<TKey,TValue> from a ParallelQuery<TSource> according to a specified key selector function.
public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
static System::Collections::Generic::Dictionary<TKey, TSource> ^ ToDictionary(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, TKey> ^ keySelector);public static System.Collections.Generic.Dictionary<TKey,TSource> ToDictionary<TSource,TKey> (this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector);static member ToDictionary : System.Linq.ParallelQuery<'Source> * Func<'Source, 'Key> -> System.Collections.Generic.Dictionary<'Key, 'Source><Extension()>
Public Function ToDictionary(Of TSource, TKey) (source As ParallelQuery(Of TSource), keySelector As Func(Of TSource, TKey)) As Dictionary(Of TKey, TSource)类型参数
- TSource
source 的元素类型。The type of the elements of source.
- TKey
keySelector 返回的键的类型。The type of the key returned by keySelector.
参数
- source
- ParallelQuery<TSource>
据其创建 Dictionary<TKey,TValue> 的序列。A sequence to create a Dictionary<TKey,TValue> from.
- keySelector
- Func<TSource,TKey>
用于从每个元素中提取键的函数。A function to extract a key from each element.
返回
- Dictionary<TKey,TSource>
一个包含键和值的 Dictionary<TKey,TValue>。A Dictionary<TKey,TValue> that contains keys and values.
例外
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 或 keySelector 为 null 引用（在 Visual Basic 中为 Nothing）。source or keySelector is a null reference (Nothing in Visual Basic).
keySelector 生成一个为 null 引用的键（在 Visual Basic 中为 Nothing）。keySelector produces a key that is a null reference (Nothing in Visual Basic). - 或 - keySelector 为两个元素产生了重复键。-or- keySelector produces duplicate keys for two elements. 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.
另请参阅
适用于
ToDictionary<TSource,TKey>(ParallelQuery<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)
根据指定的键选择器函数和键比较器，从 ParallelQuery<TSource> 创建一个 Dictionary<TKey,TValue>。Creates a Dictionary<TKey,TValue> from a ParallelQuery<TSource> according to a specified key selector function and key comparer.
public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
static System::Collections::Generic::Dictionary<TKey, TSource> ^ ToDictionary(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, TKey> ^ keySelector, System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);public static System.Collections.Generic.Dictionary<TKey,TSource> ToDictionary<TSource,TKey> (this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer);public static System.Collections.Generic.Dictionary<TKey,TSource> ToDictionary<TSource,TKey> (this System.Linq.ParallelQuery<TSource> source, Func<TSource,TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey>? comparer);static member ToDictionary : System.Linq.ParallelQuery<'Source> * Func<'Source, 'Key> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Generic.Dictionary<'Key, 'Source><Extension()>
Public Function ToDictionary(Of TSource, TKey) (source As ParallelQuery(Of TSource), keySelector As Func(Of TSource, TKey), comparer As IEqualityComparer(Of TKey)) As Dictionary(Of TKey, TSource)类型参数
- TSource
source 的元素类型。The type of the elements of source.
- TKey
keySelector 返回的键的类型。The type of the key returned by keySelector.
参数
- source
- ParallelQuery<TSource>
据其创建 Dictionary<TKey,TValue> 的序列。A sequence to create a Dictionary<TKey,TValue> from.
- keySelector
- Func<TSource,TKey>
用于从每个元素中提取键的函数。A function to extract a key from each element.
- comparer
- IEqualityComparer<TKey>
用于比较键的 IEqualityComparer<T>。An IEqualityComparer<T> to compare keys.
返回
- Dictionary<TKey,TSource>
一个包含键和值的 Dictionary<TKey,TValue>。A Dictionary<TKey,TValue> that contains keys and values.
例外
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 或 keySelector 为 null 引用（在 Visual Basic 中为 Nothing）。source or keySelector is a null reference (Nothing in Visual Basic).
keySelector 生成一个为 null 引用的键（在 Visual Basic 中为 Nothing）。keySelector produces a key that is a null reference (Nothing in Visual Basic). - 或 - keySelector 为两个元素产生了重复键。-or- keySelector produces duplicate keys for two elements. 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.