是否“使用”了陈述总是处置对象？ [英] Does "using" statement always dispose the object?

问题描述

使用语句是否总是处置对象，即使有返回值或在其中引发了异常？ IE：

Does the using statement always dispose the object, even if there is a return or an exception is thrown inside it? I.E.:

using (var myClassInstance = new MyClass())
{
    // ...
    return;
}

或

using (var myClassInstance = new MyClass())
{
    // ...
    throw new UnexplainedAndAnnoyingException();
}

推荐答案

是的，这就是重点。编译为：

Yes, that's the whole point. It compiles down to:

SomeDisposableType obj = new SomeDisposableType();
try
{
    // use obj
}
finally
{
    if (obj != null) 
        ((IDisposable)obj).Dispose();
}

请注意此处的术语；对象本身未释放。调用 Dispose（）方法，通常释放非托管资源。

Be careful about your terminology here; the object itself is not deallocated. The Dispose() method is called and, typically, unmanaged resources are released.

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