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Run mode does not behave to spec with code throwing an exception in using
See original GitHub issueThis caught me off-guard, assuming that Dispose() would not get called if an exception occurred, yet all the SO questions about exceptions inside usings claimed the opposite.
using System;
class P
{
static void Main()
{
try
{
Use();
}
catch (Exception)
{
Console.WriteLine("Caught");
}
}
static void Use()
{
Console.WriteLine("Constructing");
using (new D())
{
Console.WriteLine("Throwing");
throw new Exception();
}
}
class D : IDisposable
{
public void Dispose() => Console.WriteLine("Disposed");
}
}
Expected output (also seen in VS2017):
Constructing
Throwing
Disposed
Caught
Actual output:
Constructing
Throwing
Caught
Issue Analytics
- State:
- Created 5 years ago
- Comments:5 (4 by maintainers)
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Resolved in default: https://sharplab.io/#v2:C4LgTgrgdgPgAgBgARwIwG4CwAoHcBMSACjgN45KUqoBsKALNQBwAUAlBVedlb0sGACenPkm6jRAVQDOAU3ZYeEgL4i+AYwCGwdQAskLAKIAPdbIAOwAJYB7KByWjxE3mgCcLAEQBhTRADmusCebIouqo5IEbxqaHRwjDLyDrzOou5e3nbSAhDq1lD+IWESiAZQsgDuSAAi7CkSaS7UHp4AKrpgNpVWhcVqLsCd3UgV1SZmlrZQCgNU0fNqsYQ1SCBIAJI1VtLmNtKaAEYANrJqTa4AzAy1O3ty7EgAvAB8LV7bu/uyACb9kRFlEA===
Should be in
masterin a few hours if all goes well.OK so just for curiosity sake (and recording for myself as well) the issue is caused by
Dispose()hitting the stack limit of Unbreakable, and therefore never executing. The reason why it hits the stack limit is because being infinallyafter athrowseems to add tons of things to the stack:I have an idea for a solution, but not sure if I’ll have time to apply it today.