JuniorTheoryCommon

What does the program print?

Show();
Console.Write("C");
void Show()
{
    using var light = new Light();
    Console.Write("A");
}

class Light : IDisposable
{
    public void Dispose() => Console.Write("B");
}

ABC

Expecting BAC: a using var declaration calls Dispose at the end of its enclosing block, not right after the line that declares it.
Expecting Dispose to run only at the end of the program, or never: using calls it as soon as the block is left.

What would the program print if Show threw an exception after writing A and the caller caught it?
What does the compiler turn a using declaration into?

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JuniorTheoryCommon

What does the program print?

Show();
Console.Write("C");
void Show()
{
    using var light = new Light();
    Console.Write("A");
}

class Light : IDisposable
{
    public void Dispose() => Console.Write("B");
}

ABC

Expecting BAC: a using var declaration calls Dispose at the end of its enclosing block, not right after the line that declares it.
Expecting Dispose to run only at the end of the program, or never: using calls it as soon as the block is left.

What would the program print if Show threw an exception after writing A and the caller caught it?
What does the compiler turn a using declaration into?

Back to questions Open topic in roadmap →Answer it yourself — Quiz