If I return something within a using, will the resources be released?

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2

I know that the using is used to release (give a dispose) resources. My doubt is in the following case:

public void FuncNaoFazNada()
{
    using(var acd = new AlgumaClasseIDisposable())
    {
        return;
    }
}

In this case, will the resources used by Acd be dispensed with? Or will the flow break keep the resources allocated?

c#

2 answers

3


Yeah, it’s a syntax-sugar with exactly the same operation as Try-Finally:

var acd = new AlgumaClasseIDisposable();
try
{
    return FazAlgumaCoisa(acd);
}
finally
{
    acd.Dispose();
}

3

The answer is: will be released yes.

the using in C# is a syntactic sugar, which is nothing more than a try ... finally at the end, where this your code:

public void FuncNaoFazNada()
{
    using(var acd = new AlgumaClasseIDisposable())
    {
        return;
    }
}

Will it actually:

public void FuncNaoFazNada()
{
    var acd = new AlgumaClasseIDisposable();
    try{
        return;
    }
    finally{
        acd.Dispose();
    }
}

So despite the return within the try, it will always run the code block of the finally.

Tip: To better understand how it works, implement the second form of the code and the debug line by line. So you’ll understand what the execution flow looks like.

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