Can the DBConnection class be connected to by multiple STA threads in parallel?

Ao 21 Reputation points

When multiple STA threads try to access the DB using the DBConncetion class, all but the first one will not return a Connet function.
When the program is stopped, the locked thread will get an exception saying "COM object that has been separated from its underlying RCW cannot be used."

Can the DBConncetion class only be used from an MTA thread?

Microsoft Technologies based on the .NET software framework.
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Accepted answer
  1. Daniel Zhang-MSFT 9,621 Reputation points

    Hi TakuyaYamauchi-1944,
    Connections, commands, and readers are not thread-safe. Therefore, if you intend to run this code in multiple threads, each thread needs to create its own connections, commands, and readers. And if your application is multi-threaded, you need to use it in each The COM object is instantiated in the thread.
    The STA model is used for non-thread-safe COM objects. If the COM object can handle its own synchronization, you can use the MTA model, which allows multiple threads to interact with the object without marshalling calls.
    Here is a thread to help you understand better.
    Best Regards,
    Daniel Zhang

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