ConcurrentDictionary<TKey,TValue> 构造函数
定义
重要
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初始化 ConcurrentDictionary<TKey,TValue> 类的新实例。
重载
ConcurrentDictionary<TKey,TValue>()
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
初始化 ConcurrentDictionary<TKey,TValue> 类的新实例,该实例为空,具有默认的并发级别和默认的初始容量,并为键类型使用默认比较器。
public:
ConcurrentDictionary();
public ConcurrentDictionary ();
Public Sub New ()
注解
默认并发级别等于 CPU 数。 并发级别越高,可以在不干扰和阻塞的情况下执行更多并发写入操作。 较高的并发级别值还会导致需要所有锁 (的操作(例如,表大小 ToArray
调整和 Count
) )变得更加昂贵。 默认容量 (DEFAULT_CAPACITY) 表示初始存储桶数,是在构造大型字典时,非常小的字典的大小与重设大小的次数之间的权衡。 此外,容量不应由小质数进行除法。 默认容量为 31。
另请参阅
适用于
ConcurrentDictionary<TKey,TValue>(IEnumerable<KeyValuePair<TKey,TValue>>)
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
初始化 ConcurrentDictionary<TKey,TValue> 类的新实例,该实例包含从指定的 IEnumerable<T> 中复制的元素,具有默认的并发级别和默认的初始容量,并为键类型使用默认比较器。
public:
ConcurrentDictionary(System::Collections::Generic::IEnumerable<System::Collections::Generic::KeyValuePair<TKey, TValue>> ^ collection);
public ConcurrentDictionary (System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<TKey,TValue>> collection);
new System.Collections.Concurrent.ConcurrentDictionary<'Key, 'Value> : seq<System.Collections.Generic.KeyValuePair<'Key, 'Value>> -> System.Collections.Concurrent.ConcurrentDictionary<'Key, 'Value>
Public Sub New (collection As IEnumerable(Of KeyValuePair(Of TKey, TValue)))
参数
- collection
- IEnumerable<KeyValuePair<TKey,TValue>>
IEnumerable<T>,它的元素被复制到新 ConcurrentDictionary<TKey,TValue>。
例外
collection
或其任何键为 null
。
collection
包含一个或多个重复键。
另请参阅
适用于
ConcurrentDictionary<TKey,TValue>(IEqualityComparer<TKey>)
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
初始化 ConcurrentDictionary<TKey,TValue> 类的新实例,该实例为空,具有默认的并发级别和容量,并使用指定的 IEqualityComparer<T>。
public:
ConcurrentDictionary(System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);
public ConcurrentDictionary (System.Collections.Generic.IEqualityComparer<TKey> comparer);
public ConcurrentDictionary (System.Collections.Generic.IEqualityComparer<TKey>? comparer);
new System.Collections.Concurrent.ConcurrentDictionary<'Key, 'Value> : System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Concurrent.ConcurrentDictionary<'Key, 'Value>
Public Sub New (comparer As IEqualityComparer(Of TKey))
参数
- comparer
- IEqualityComparer<TKey>
在对键进行比较时使用的相等比较实现。
例外
comparer
为 null
。
另请参阅
适用于
ConcurrentDictionary<TKey,TValue>(IEnumerable<KeyValuePair<TKey,TValue>>, IEqualityComparer<TKey>)
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
初始化 类的新实例,该类 ConcurrentDictionary<TKey,TValue> 包含从指定的 IEnumerable 复制的元素具有默认并发级别,具有默认的初始容量,并使用指定的 IEqualityComparer<T>。
public:
ConcurrentDictionary(System::Collections::Generic::IEnumerable<System::Collections::Generic::KeyValuePair<TKey, TValue>> ^ collection, System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);
public ConcurrentDictionary (System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<TKey,TValue>> collection, System.Collections.Generic.IEqualityComparer<TKey> comparer);
public ConcurrentDictionary (System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<TKey,TValue>> collection, System.Collections.Generic.IEqualityComparer<TKey>? comparer);
new System.Collections.Concurrent.ConcurrentDictionary<'Key, 'Value> : seq<System.Collections.Generic.KeyValuePair<'Key, 'Value>> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Concurrent.ConcurrentDictionary<'Key, 'Value>
Public Sub New (collection As IEnumerable(Of KeyValuePair(Of TKey, TValue)), comparer As IEqualityComparer(Of TKey))
参数
- collection
- IEnumerable<KeyValuePair<TKey,TValue>>
IEnumerable<T>,它的元素被复制到新 ConcurrentDictionary<TKey,TValue>。
- comparer
- IEqualityComparer<TKey>
在对键进行比较时使用的 IEqualityComparer<T> 实现。
例外
collection
或 comparer
为 null
。
另请参阅
适用于
ConcurrentDictionary<TKey,TValue>(Int32, Int32)
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
初始化 ConcurrentDictionary<TKey,TValue> 类的新实例,该实例为空,具有指定的并发级别和容量,并为键类型使用默认比较器。
public:
ConcurrentDictionary(int concurrencyLevel, int capacity);
public ConcurrentDictionary (int concurrencyLevel, int capacity);
new System.Collections.Concurrent.ConcurrentDictionary<'Key, 'Value> : int * int -> System.Collections.Concurrent.ConcurrentDictionary<'Key, 'Value>
Public Sub New (concurrencyLevel As Integer, capacity As Integer)
参数
- concurrencyLevel
- Int32
将同时更新 ConcurrentDictionary<TKey,TValue> 的估计线程数,或仅在 .NET 8+ 中更新 -1,以指示默认并发级别。
- capacity
- Int32
ConcurrentDictionary<TKey,TValue> 可包含的初始元素数。
例外
另请参阅
适用于
ConcurrentDictionary<TKey,TValue>(Int32, IEnumerable<KeyValuePair<TKey,TValue>>, IEqualityComparer<TKey>)
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
初始化 ConcurrentDictionary<TKey,TValue> 类的新实例,该实例包含从指定的 IEnumerable 中复制的元素并使用指定的 IEqualityComparer<T>。
public:
ConcurrentDictionary(int concurrencyLevel, System::Collections::Generic::IEnumerable<System::Collections::Generic::KeyValuePair<TKey, TValue>> ^ collection, System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);
public ConcurrentDictionary (int concurrencyLevel, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<TKey,TValue>> collection, System.Collections.Generic.IEqualityComparer<TKey> comparer);
public ConcurrentDictionary (int concurrencyLevel, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<TKey,TValue>> collection, System.Collections.Generic.IEqualityComparer<TKey>? comparer);
new System.Collections.Concurrent.ConcurrentDictionary<'Key, 'Value> : int * seq<System.Collections.Generic.KeyValuePair<'Key, 'Value>> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Concurrent.ConcurrentDictionary<'Key, 'Value>
Public Sub New (concurrencyLevel As Integer, collection As IEnumerable(Of KeyValuePair(Of TKey, TValue)), comparer As IEqualityComparer(Of TKey))
参数
- concurrencyLevel
- Int32
将同时更新 ConcurrentDictionary<TKey,TValue> 的估计线程数,或仅在 .NET 8+ 中更新 -1,以指示默认并发级别。
- collection
- IEnumerable<KeyValuePair<TKey,TValue>>
IEnumerable<T>,它的元素被复制到新 ConcurrentDictionary<TKey,TValue>。
- comparer
- IEqualityComparer<TKey>
在对键进行比较时使用的 IEqualityComparer<T> 实现。
例外
collection
或 comparer
为 null
。
concurrencyLevel
小于 1。
collection
包含一个或多个重复键。
另请参阅
适用于
ConcurrentDictionary<TKey,TValue>(Int32, Int32, IEqualityComparer<TKey>)
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
- Source:
- ConcurrentDictionary.cs
初始化 ConcurrentDictionary<TKey,TValue> 类的新实例,该实例为空,具有指定的并发级别和指定的初始容量,并使用指定的 IEqualityComparer<T>。
public:
ConcurrentDictionary(int concurrencyLevel, int capacity, System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);
public ConcurrentDictionary (int concurrencyLevel, int capacity, System.Collections.Generic.IEqualityComparer<TKey> comparer);
public ConcurrentDictionary (int concurrencyLevel, int capacity, System.Collections.Generic.IEqualityComparer<TKey>? comparer);
new System.Collections.Concurrent.ConcurrentDictionary<'Key, 'Value> : int * int * System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Concurrent.ConcurrentDictionary<'Key, 'Value>
Public Sub New (concurrencyLevel As Integer, capacity As Integer, comparer As IEqualityComparer(Of TKey))
参数
- concurrencyLevel
- Int32
将同时更新 ConcurrentDictionary<TKey,TValue> 的估计线程数,或仅在 .NET 8+ 中更新 -1,以指示默认并发级别。
- capacity
- Int32
ConcurrentDictionary<TKey,TValue> 可包含的初始元素数。
- comparer
- IEqualityComparer<TKey>
在对键进行比较时使用的 IEqualityComparer<T> 实现。
例外
comparer
为 null
。
concurrencyLevel
或 capacity
小于 1。