C# で言うとこんな感じに・・・><
Exception lasterror = null;
try
{
Fuga();
}
catch (Exception ex)
{
lasterror = ex;
}
if (lasterror != null)
{
if (lasterror is TekitounaError)
{
Console.WriteLine($"てきとうなえらー!><;{lasterror.Message}");
}
}