由Visual Studio自动生成的代码是否是线程安全的？

Question

I'm learning C#. Sorry for the newbie question.

This is part of some code that's automatically generated by Visual Studio 2015 when I start a Windows Forms project. It's in Form1.Designer.cs

    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }

I'm trying to see if I understand the concept of thread-safety correctly. Isn't it possible for components to be set to null between the time the if statement is evaluated and the time components.Dispose() is called?

Thanks in advance for any help understanding this!

Answer 1

No, it's not thread-safe code. Your assumption is correct that components could become null between the check and the Dispose .

However, that doesn't mean it's bad code. Not all code needs to be thread-safe. If two threads were disposing the same object, it's very likely that that behaviour is a bug, rather than Dispose being erroneous.