使用lock和volatile缓存变量

锁是否强制变量直接写入内存，而不是像volatile那样beëing缓存?在这个问题中，Orion Edwards说使用锁比使用volatile更好，但是如果从锁内访问公共变量，并且总是从该锁访问，这是否意味着它永远不会在该锁语句之外缓存?

private readonly object locker = new object();
private bool? _Var = null;
public bool? Var
{
    get 
    {
        lock (locker)
        {
            //possibly get the variable _Var in cache memory somewhere
            return this._Var;
            //force _Var back to memory
        }
    }
    set 
    {
        lock (locker)
        {
            //possibly get the variable _Var in cache memory somewhere
            this._Var = value;
            //force _Var back to memory
        }
    }
}