Writing to StreamWriter.Null can cause exceptions #98457
Description
This surprised me as I thought a null stream was stateless and did nothing...
string longLine = new string('#', 100000);
Parallel.For(0, 25, i => StreamWriter.Null.WriteLine(longLine));produces
Unhandled exception. System.AggregateException: One or more errors occurred. (Arithmetic operation resulted in an overflow.) (Arithmetic operation resulted in an overflow.) (Specified argument was out of the range of valid values.) (Arithmetic operation resulted in an overflow.) (Arithmetic operation resulted in an overflow.) (Arithmetic operation resulted in an overflow.) (Arithmetic operation resulted in an overflow.) (Arithmetic operation resulted in an overflow.) (Specified argument was out of the range of valid values.) (Specified argument was out of the range of valid values.) (Arithmetic operation resulted in an overflow.) (Arithmetic operation resulted in an overflow.) (Specified argument was out of the range of valid values.)
---> System.OverflowException: Arithmetic operation resulted in an overflow.
at System.IO.StreamWriter.WriteLine(String value)
at Program.<>c__DisplayClass0_0.<<Main>$>b__0(Int32 i) in D:\bugs\streaming-spmi\null\Program.cs:line 4
at System.Threading.Tasks.Parallel.<>c__DisplayClass19_0`2.<ForWorker>b__1(RangeWorker& currentWorker, Int64 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
--- End of stack trace from previous location ---
at System.Threading.Tasks.Parallel.<>c__DisplayClass19_0`2.<ForWorker>b__1(RangeWorker& currentWorker, Int64 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
at System.Threading.Tasks.TaskReplicator.Replica.Execute()
--- End of inner exception stack trace ---
at System.Threading.Tasks.TaskReplicator.Run[TState](ReplicatableUserAction`1 action, ParallelOptions options, Boolean stopOnFirstFailure)
at System.Threading.Tasks.Parallel.ForWorker[TLocal,TInt](TInt fromInclusive, TInt toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
--- End of stack trace from previous location ---
at System.Threading.Tasks.Parallel.ForWorker[TLocal,TInt](TInt fromInclusive, TInt toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
at System.Threading.Tasks.Parallel.For(Int32 fromInclusive, Int32 toExclusive, Action`1 body)
at Program.<Main>$(String[] args) in D:\bugs\streaming-spmi\null\Program.cs:line 4
---> (Inner Exception #1) System.OverflowException: Arithmetic operation resulted in an overflow.
at System.IO.StreamWriter.WriteLine(String value)
at Program.<>c__DisplayClass0_0.<<Main>$>b__0(Int32 i) in D:\bugs\streaming-spmi\null\Program.cs:line 4
at System.Threading.Tasks.Parallel.<>c__DisplayClass19_0`2.<ForWorker>b__1(RangeWorker& currentWorker, Int64 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
--- End of stack trace from previous location ---
at System.Threading.Tasks.Parallel.<>c__DisplayClass19_0`2.<ForWorker>b__1(RangeWorker& currentWorker, Int64 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
at System.Threading.Tasks.TaskReplicator.Replica.Execute()<---