ConcurrentDictionary<TKey,TValue>.AddOrUpdate メソッド

定義

キーがまだ存在しない場合は ConcurrentDictionary<TKey,TValue> にキーと値のペアを追加し、キーが既に存在する場合は ConcurrentDictionary<TKey,TValue> のキーと値のペアを更新します。Adds a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or updates a key/value pair in the ConcurrentDictionary<TKey,TValue> if the key already exists.

オーバーロード

AddOrUpdate(TKey, Func<TKey,TValue>, Func<TKey,TValue,TValue>)

指定した関数を使用して、キーがまだ存在しない場合は ConcurrentDictionary<TKey,TValue> にキーと値のペアを追加し、キーが既に存在する場合は ConcurrentDictionary<TKey,TValue> のキーと値のペアを更新します。Uses the specified functions to add a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary<TKey,TValue> if the key already exists.

AddOrUpdate(TKey, TValue, Func<TKey,TValue,TValue>)

キーがまだ存在しない場合は ConcurrentDictionary<TKey,TValue> にキーと値のペアを追加し、キーが既に存在する場合は、指定された関数を使用して ConcurrentDictionary<TKey,TValue> のキーと値のペアを更新します。Adds a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or updates a key/value pair in the ConcurrentDictionary<TKey,TValue> by using the specified function if the key already exists.

AddOrUpdate<TArg>(TKey, Func<TKey,TArg,TValue>, Func<TKey,TValue,TArg,TValue>, TArg)

指定した関数と引数を使用して、キーがまだ存在しない場合は ConcurrentDictionary<TKey,TValue> にキーと値のペアを追加し、キーが既に存在する場合は ConcurrentDictionary<TKey,TValue> のキーと値のペアを更新します。Uses the specified functions and argument to add a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary<TKey,TValue> if the key already exists.

次の例は、 AddOrUpdateメソッドを呼び出す方法を示しています。The following example shows how to call the AddOrUpdate method:

class CD_GetOrAddOrUpdate
{
    // Demonstrates:
    //      ConcurrentDictionary<TKey, TValue>.AddOrUpdate()
    //      ConcurrentDictionary<TKey, TValue>.GetOrAdd()
    //      ConcurrentDictionary<TKey, TValue>[]
    static void Main()
    {
        // Construct a ConcurrentDictionary
        ConcurrentDictionary<int, int> cd = new ConcurrentDictionary<int, int>();

        // Bombard the ConcurrentDictionary with 10000 competing AddOrUpdates
        Parallel.For(0, 10000, i =>
        {
            // Initial call will set cd[1] = 1.  
            // Ensuing calls will set cd[1] = cd[1] + 1
            cd.AddOrUpdate(1, 1, (key, oldValue) => oldValue + 1);
        });

        Console.WriteLine("After 10000 AddOrUpdates, cd[1] = {0}, should be 10000", cd[1]);

        // Should return 100, as key 2 is not yet in the dictionary
        int value = cd.GetOrAdd(2, (key) => 100);
        Console.WriteLine("After initial GetOrAdd, cd[2] = {0} (should be 100)", value);

        // Should return 100, as key 2 is already set to that value
        value = cd.GetOrAdd(2, 10000);
        Console.WriteLine("After second GetOrAdd, cd[2] = {0} (should be 100)", value);
    }
}
' Imports System.Collections.Concurrent
' Imports System.Threading.Tasks

Class CD_GetOrAddOrUpdate

    ' Demonstrates:
    ' ConcurrentDictionary<TKey, TValue>.AddOrUpdate()
    ' ConcurrentDictionary<TKey, TValue>.GetOrAdd()
    ' ConcurrentDictionary<TKey, TValue>[]
    Shared Sub Main()
        ' Construct a ConcurrentDictionary
        Dim cd As New ConcurrentDictionary(Of Integer, Integer)()

        ' Bombard the ConcurrentDictionary with 10000 competing AddOrUpdates
        Parallel.For(0, 10000,
                       Sub(i)
                           ' Initial call will set cd[1] = 1. 
                           ' Ensuing calls will set cd[1] = cd[1] + 1
                           cd.AddOrUpdate(1, 1, Function(key, oldValue) oldValue + 1)
                       End Sub)

        Console.WriteLine("After 10000 AddOrUpdates, cd[1] = {0}, should be 10000", cd(1))

        ' Should return 100, as key 2 is not yet in the dictionary
        Dim value As Integer = cd.GetOrAdd(2, Function(key) 100)
        Console.WriteLine("After initial GetOrAdd, cd[2] = {0} (should be 100)", value)

        ' Should return 100, as key 2 is already set to that value
        value = cd.GetOrAdd(2, 10000)
        Console.WriteLine("After second GetOrAdd, cd[2] = {0} (should be 100)", value)
    End Sub
End Class

AddOrUpdate(TKey, Func<TKey,TValue>, Func<TKey,TValue,TValue>)

指定した関数を使用して、キーがまだ存在しない場合は ConcurrentDictionary<TKey,TValue> にキーと値のペアを追加し、キーが既に存在する場合は ConcurrentDictionary<TKey,TValue> のキーと値のペアを更新します。Uses the specified functions to add a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary<TKey,TValue> if the key already exists.

public:
 TValue AddOrUpdate(TKey key, Func<TKey, TValue> ^ addValueFactory, Func<TKey, TValue, TValue> ^ updateValueFactory);
public TValue AddOrUpdate (TKey key, Func<TKey,TValue> addValueFactory, Func<TKey,TValue,TValue> updateValueFactory);
member this.AddOrUpdate : 'Key * Func<'Key, 'Value> * Func<'Key, 'Value, 'Value> -> 'Value
Public Function AddOrUpdate (key As TKey, addValueFactory As Func(Of TKey, TValue), updateValueFactory As Func(Of TKey, TValue, TValue)) As TValue

パラメーター

key
TKey

追加するキーまたは値を更新するキーThe key to be added or whose value should be updated

addValueFactory
Func<TKey,TValue>

キーが存在しない場合に、値を生成するために使用される関数The function used to generate a value for an absent key

updateValueFactory
Func<TKey,TValue,TValue>

キーが存在する場合に、キーの既存の値に基づいて新しい値を生成するために使用される関数The function used to generate a new value for an existing key based on the key's existing value

戻り値

TValue

キーの新しい値。The new value for the key. これは、addValueFactory の結果 (キーが存在しない場合) か updateValueFactory の結果 (キーが存在する場合) のどちらかになります。This will be either be the result of addValueFactory (if the key was absent) or the result of updateValueFactory (if the key was present).

例外

keyaddValueFactory、または updateValueFactorynull です。key, addValueFactory, or updateValueFactory is null.

ディクショナリには、既に要素の最大数 (MaxValue) が含まれています。The dictionary already contains the maximum number of elements (MaxValue).

注釈

異なるスレッドでAddOrUpdate同時にを呼び出すaddValueFactoryと、が複数回呼び出される可能性がありますが、そのキーと値のペアは、呼び出しごとにディクショナリに追加されない可能性があります。If you call AddOrUpdate simultaneously on different threads, addValueFactory may be called multiple times, but its key/value pair might not be added to the dictionary for every call.

ディクショナリに対する変更および書き込み操作の場合ConcurrentDictionary<TKey,TValue> 、ではきめ細かなロックを使用してスレッドセーフを確保します。For modifications and write operations to the dictionary, ConcurrentDictionary<TKey,TValue> uses fine-grained locking to ensure thread safety. (ディクショナリに対する読み取り操作は、ロックなしの方法で実行されます)。ただし、ロックaddValueFactoryupdateValueFactory下で不明なコードを実行した場合に発生する可能性のある問題を回避するために、およびデリゲートはロックの外部で呼び出されます。(Read operations on the dictionary are performed in a lock-free manner.) However, the addValueFactory and updateValueFactory delegates are called outside the locks to avoid the problems that can arise from executing unknown code under a lock. したがってAddOrUpdate 、は、 ConcurrentDictionary<TKey,TValue>クラスの他のすべての操作に関してアトミックではありません。Therefore, AddOrUpdate is not atomic with regards to all other operations on the ConcurrentDictionary<TKey,TValue> class.

こちらもご覧ください

AddOrUpdate(TKey, TValue, Func<TKey,TValue,TValue>)

キーがまだ存在しない場合は ConcurrentDictionary<TKey,TValue> にキーと値のペアを追加し、キーが既に存在する場合は、指定された関数を使用して ConcurrentDictionary<TKey,TValue> のキーと値のペアを更新します。Adds a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or updates a key/value pair in the ConcurrentDictionary<TKey,TValue> by using the specified function if the key already exists.

public:
 TValue AddOrUpdate(TKey key, TValue addValue, Func<TKey, TValue, TValue> ^ updateValueFactory);
public TValue AddOrUpdate (TKey key, TValue addValue, Func<TKey,TValue,TValue> updateValueFactory);
member this.AddOrUpdate : 'Key * 'Value * Func<'Key, 'Value, 'Value> -> 'Value
Public Function AddOrUpdate (key As TKey, addValue As TValue, updateValueFactory As Func(Of TKey, TValue, TValue)) As TValue

パラメーター

key
TKey

追加するキーまたは値を更新するキーThe key to be added or whose value should be updated

addValue
TValue

キーが存在しない場合に追加する値The value to be added for an absent key

updateValueFactory
Func<TKey,TValue,TValue>

キーが存在する場合に、キーの既存の値に基づいて新しい値を生成するために使用される関数The function used to generate a new value for an existing key based on the key's existing value

戻り値

TValue

キーの新しい値。The new value for the key. これは、addValue (キーが存在しない場合) か updateValueFactory の結果 (キーが存在する場合) のどちらかになります。This will be either be addValue (if the key was absent) or the result of updateValueFactory (if the key was present).

例外

key または updateValueFactorynull です。key or updateValueFactory is null.

ディクショナリには、既に要素の最大数 (MaxValue) が含まれています。The dictionary already contains the maximum number of elements (MaxValue).

次のコード例は、を初期化ConcurrentDictionary<TKey,TValue>する方法と、addorupdate メソッドを使用してコレクションに項目を追加し、既存の項目を更新する方法を示しています。The following code example shows how to initialize an ConcurrentDictionary<TKey,TValue> and how to use the AddOrUpdate method to add an additional item to the collection, and update the existing items.

using System;
using System.Collections.Concurrent;

class CD_Ctor
{
    // Demonstrates: 
    //      ConcurrentDictionary<TKey, TValue> ctor(concurrencyLevel, initialCapacity) 
    //      ConcurrentDictionary<TKey, TValue>[TKey] 
    static void Main()
    {
        // We know how many items we want to insert into the ConcurrentDictionary. 
        // So set the initial capacity to some prime number above that, to ensure that 
        // the ConcurrentDictionary does not need to be resized while initializing it. 
        int HIGHNUMBER = 64;
        int initialCapacity = 101;

        // The higher the concurrencyLevel, the higher the theoretical number of operations 
        // that could be performed concurrently on the ConcurrentDictionary.  However, global 
        // operations like resizing the dictionary take longer as the concurrencyLevel rises.  
        // For the purposes of this example, we'll compromise at numCores * 2. 
        int numProcs = Environment.ProcessorCount;
        int concurrencyLevel = numProcs * 2;

        // Construct the dictionary with the desired concurrencyLevel and initialCapacity
        ConcurrentDictionary<int, int> cd = new ConcurrentDictionary<int, int>(concurrencyLevel, initialCapacity);

        // Initialize the dictionary 
        for (int i = 1; i <= HIGHNUMBER; i++) cd[i] = i * i;

        Console.WriteLine("The square of 23 is {0} (should be {1})", cd[23], 23 * 23);

        // Now iterate through, adding one to the end of the list. Existing items should be updated to be divided by their 
        // key  and a new item will be added that is the square of its key.
        for (int i = 1; i <= HIGHNUMBER + 1; i++)
          cd.AddOrUpdate(i, i * i, (k,v) => v / i);

        Console.WriteLine("The square root of 529 is {0} (should be {1})", cd[23], 529 / 23);
        Console.WriteLine("The square of 65 is {0} (should be {1})", cd[HIGHNUMBER + 1], ((HIGHNUMBER + 1) * (HIGHNUMBER + 1)));
       
    }
}
Imports System.Collections.Concurrent

Class CD_Ctor
    ' Demonstrates: 
    '      ConcurrentDictionary<TKey, TValue> ctor(concurrencyLevel, initialCapacity) 
    '      ConcurrentDictionary<TKey, TValue>[TKey] 
    Public Shared Sub Main()
        ' We know how many items we want to insert into the ConcurrentDictionary. 
        ' So set the initial capacity to some prime number above that, to ensure that 
        ' the ConcurrentDictionary does not need to be resized while initializing it. 
        Dim HIGHNUMBER As Integer = 64
        Dim initialCapacity As Integer = 101

        ' The higher the concurrencyLevel, the higher the theoretical number of operations 
        ' that could be performed concurrently on the ConcurrentDictionary.  However, global 
        ' operations like resizing the dictionary take longer as the concurrencyLevel rises.  
        ' For the purposes of this example, we'll compromise at numCores * 2. 
        Dim numProcs As Integer = Environment.ProcessorCount
        Dim concurrencyLevel As Integer = numProcs * 2

        ' Construct the dictionary with the desired concurrencyLevel and initialCapacity
        Dim cd As New ConcurrentDictionary(Of Integer, Integer)(concurrencyLevel, initialCapacity)

        ' Initialize the dictionary 
        For i As Integer = 1 To HIGHNUMBER
            cd(i) = i * i
        Next

        Console.WriteLine("The square of 23 is {0} (should be {1})", cd(23), 23 * 23)

        ' Now iterate through, adding one to the end of the list. Existing items should be updated to be divided by their 
        ' key  and a new item will be added that is the square of its key.
        For i As Integer = 1 To HIGHNUMBER + 1

            cd.AddOrUpdate(i, i * i, Function(k, v)
                                         Return v / i
                                     End Function)
        Next

        Console.WriteLine("The square root of 529 is {0} (should be {1})", cd(23), 529 / 23)
        Console.WriteLine("The square of 65 is {0} (should be {1})", cd(HIGHNUMBER + 1), ((HIGHNUMBER + 1) * (HIGHNUMBER + 1)))

    End Sub
End Class

ディクショナリに対する変更および書き込み操作の場合ConcurrentDictionary<TKey,TValue> 、ではきめ細かなロックを使用してスレッドセーフを確保します。For modifications and write operations to the dictionary, ConcurrentDictionary<TKey,TValue> uses fine-grained locking to ensure thread safety. (ディクショナリに対する読み取り操作は、ロックなしの方法で実行されます)。ただし、ロックupdateValueFactoryの下で不明なコードを実行した場合に発生する可能性のある問題を回避するために、デリゲートはロックの外部で呼び出されます。(Read operations on the dictionary are performed in a lock-free manner.) However, the updateValueFactory delegate is called outside the locks to avoid the problems that can arise from executing unknown code under a lock. したがってAddOrUpdate 、は、 ConcurrentDictionary<TKey,TValue>クラスの他のすべての操作に関してアトミックではありません。Therefore, AddOrUpdate is not atomic with regards to all other operations on the ConcurrentDictionary<TKey,TValue> class.

こちらもご覧ください

AddOrUpdate<TArg>(TKey, Func<TKey,TArg,TValue>, Func<TKey,TValue,TArg,TValue>, TArg)

指定した関数と引数を使用して、キーがまだ存在しない場合は ConcurrentDictionary<TKey,TValue> にキーと値のペアを追加し、キーが既に存在する場合は ConcurrentDictionary<TKey,TValue> のキーと値のペアを更新します。Uses the specified functions and argument to add a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary<TKey,TValue> if the key already exists.

public:
generic <typename TArg>
 TValue AddOrUpdate(TKey key, Func<TKey, TArg, TValue> ^ addValueFactory, Func<TKey, TValue, TArg, TValue> ^ updateValueFactory, TArg factoryArgument);
public TValue AddOrUpdate<TArg> (TKey key, Func<TKey,TArg,TValue> addValueFactory, Func<TKey,TValue,TArg,TValue> updateValueFactory, TArg factoryArgument);
member this.AddOrUpdate : 'Key * Func<'Key, 'Arg, 'Value> * Func<'Key, 'Value, 'Arg, 'Value> * 'Arg -> 'Value
Public Function AddOrUpdate(Of TArg) (key As TKey, addValueFactory As Func(Of TKey, TArg, TValue), updateValueFactory As Func(Of TKey, TValue, TArg, TValue), factoryArgument As TArg) As TValue

型パラメーター

TArg

addValueFactory およびupdateValueFactoryに渡す引数の型。The type of an argument to pass into addValueFactory and updateValueFactory.

パラメーター

key
TKey

追加するキーまたは値を更新するキー。The key to be added or whose value should be updated.

addValueFactory
Func<TKey,TArg,TValue>

キーが存在しない場合に、値を生成するために使用される関数。The function used to generate a value for an absent key.

updateValueFactory
Func<TKey,TValue,TArg,TValue>

キーの既存の値に基づいて、既存のキーの新しい値を生成するために使用される関数。The function used to generate a new value for an existing key based on the key's existing value.

factoryArgument
TArg

addValueFactoryupdateValueFactory に渡す引数。An argument to pass into addValueFactory and updateValueFactory.

戻り値

TValue

キーの新しい値。The new value for the key. これは、addValueFactory の結果 (キーが存在しない場合) か updateValueFactory の結果 (キーが存在する場合) のどちらかになります。This will be either be the result of addValueFactory (if the key was absent) or the result of updateValueFactory (if the key was present).

例外

keyaddValueFactory、または updateValueFactory が null 参照 (Visual Basic の場合は Nothing) です。key, addValueFactory, or updateValueFactory is a null reference (Nothing in Visual Basic).

ディレクトリに含まれている要素が多すぎます。The dictionary contains too many elements.

注釈

異なるスレッドでAddOrUpdate同時にを呼び出すaddValueFactoryと、が複数回呼び出される可能性がありますが、そのキーと値のペアは、呼び出しごとにディクショナリに追加されない可能性があります。If you call AddOrUpdate simultaneously on different threads, addValueFactory may be called multiple times, but its key/value pair might not be added to the dictionary for every call.

ディクショナリに対する変更および書き込み操作の場合ConcurrentDictionary<TKey,TValue> 、ではきめ細かなロックを使用してスレッドセーフを確保します。For modifications and write operations to the dictionary, ConcurrentDictionary<TKey,TValue> uses fine-grained locking to ensure thread safety. (ディクショナリに対する読み取り操作は、ロックなしの方法で実行されます)。ただし、ロックaddValueFactoryupdateValueFactory下で不明なコードを実行した場合に発生する可能性のある問題を回避するために、およびデリゲートはロックの外部で呼び出されます。(Read operations on the dictionary are performed in a lock-free manner.) However, the addValueFactory and updateValueFactory delegates are called outside the locks to avoid the problems that can arise from executing unknown code under a lock. したがってAddOrUpdate 、は、 ConcurrentDictionary<TKey,TValue>クラスの他のすべての操作に関してアトミックではありません。Therefore, AddOrUpdate is not atomic with regards to all other operations on the ConcurrentDictionary<TKey,TValue> class.

適用対象