问题
How can I send and receive messages between threads?
回答1:
One solution would be share a concurrent queue, for example (albeit its name) ConcurrentQueue. This will allow you to enqueue an object from one thread and have the other thread (or others threads) dequeue from the queue. As it is a generic solution, you may pass strongly typed items, anything from string to Action will do, or your own custom message class of course.
Threre is just one limitation with this approach, the class ConcurrentQueue is only available from .NET 4.0 onwards. If you need this for a previous version of .NET you need to look for a third party libary. For example you can take the source for ConcurrentQueue from mono.
The general approach over which those queues work is by having a linked list and they resource to optimistic concurrency control using spinning for synchronization. As far as I know, this is the state of art for concurrent queues of variable size. Now, if you know the message load beforehand you can try a fixed size approach or a solution that favors enqueue and dequeue over growing (that would be an array based queue).
Full disclouser (according to faq): I'm the author of one of those third party libraries... my libraries (nuget available), it includes a backport ConcurrentQueue for old versions of .NET, based on a custom implementation. You can find the underlaying structure under Theraot.Collections.ThreadSafe.SafeQueue, it is a linked list of arrays (which are kept in an object pool), by doing it this way, we do not need to copy the arrays to grow (because we just add another node to the list), and we do not need to rely on synchronization mechanisms as often (because adding or removing an item does not modify the list often).
Note: this question used to link to HashBucket, which is hosted on another repository, and was my old solution for the problem. That project is discontinued, please use the version I mention above.
回答2:
This is an old question, but still a relevant topic...
A producer/consumer approach may be used as possible solution for a problem like this. .NET Core, from version 3.0, has a namespace with tools to deal with that in a simple way.
Take a look on System.Threading.Channels:
https://docs.microsoft.com/en-us/dotnet/api/system.threading.channels https://devblogs.microsoft.com/dotnet/an-introduction-to-system-threading-channels/
回答3:
I think you are talking about Joining between threads? and this.
回答4:
One way to do it is to create a class that has the method that you will call for the thread.
That class can have more than just the method; it can have members that the parent thread can have access to.
Given that, the parent can read from and write to those members, that way there is a means of communication between the two threads throughout the span of the thread's life.
回答5:
There are many thread synchronization primitives you can use in .Net such as EventWaitHandle, Mutex, Semaphores etc. Here is a useful link on MSDN to find out how. - http://msdn.microsoft.com/en-us/library/ms228964.aspx
来源：https://stackoverflow.com/questions/4237392/sending-messages-between-threads-in-c-sharp