c# - 并发词典的正确用法

Question

我认为这是对并发字典的正确使用吗

private ConcurrentDictionary<int,long> myDic = new ConcurrentDictionary<int,long>();

//Main thread at program startup

for(int i = 0; i < 4; i++)
{
  myDic.Add(i, 0);
}

//Separate threads use this to update a value

myDic[InputID] = newLongValue;

我没有锁等，只是更新字典中的值，即使多个线程可能正在尝试执行相同的操作。

Answer 1

这取决于线程安全的含义。

来自 MSDN - How to: Add and Remove Items from a ConcurrentDictionary :

ConcurrentDictionary<TKey, TValue> is designed for multithreaded scenarios. You do not have to use locks in your code to add or remove items from the collection. However, it is always possible for one thread to retrieve a value, and another thread to immediately update the collection by giving the same key a new value.

因此，可能会得到字典中某项值的不一致 View 。