What's the difference between Lazy.Force() and Lazy.Value

问题

On the MSDN documentation for Lazy.Force<T> extension method says:

Forces the execution of this value and returns its result. Same as Value. Mutual exclusion is used to prevent other threads from also computing the value.

Does it mean that it's equivalent to creating a Lazy<T> instance with ExecutionAndPublication LazyThreadSafetyMode so that only one thread can initialize the instance?

Thanks

回答1:

Yes. They are both the same, and both make sure that the value will be computed only once.

回答2:

It's a bit strange that the method exists and is not a function - it's not composable and replicates the behavior of .Value.

I would define something like the following (as seen in the F# compiler):

module Lazy =
    // Lazy.force : Lazy<'T> -> 'T
    let force (x: Lazy<'T>) = x.Force()

来源：https://stackoverflow.com/questions/7569310/whats-the-difference-between-lazy-force-and-lazy-value