线程安全集合 ConcurrentDictionary<TKey, TValue> 类

ConcurrentDictionary<TKey, TValue> 类

【表示可由多个线程同时访问的键/值对的线程安全集合。】

支持 .NET Framework 4.0 及以上。

示例代码：

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 NUMITEMS = ;

            int initialCapacity = ;

            // 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 * ;

            // 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 = ; i < NUMITEMS; i++) cd[i] = i * i;

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

        }

}

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