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Yield return inside try catch
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public static class EnumerableExtensions | |
{ | |
/// <summary> | |
/// Handles the exception and returns either new one (can be same as received) or <c>null</c> - which means exception is handled and should not be | |
/// thrown. Enumerations ends in any case. | |
/// </summary> | |
public static IEnumerable<T> Catching<T, TMoveNextException>( | |
this IEnumerable<T> seq, | |
Func<TMoveNextException, Exception?> catchOnMoveNext) | |
where TMoveNextException : Exception | |
{ | |
seq.NotNull(); | |
catchOnMoveNext.NotNull(); | |
var enumerator = seq.GetEnumerator(); | |
using (enumerator) | |
{ | |
bool moved; | |
do | |
{ | |
moved = false; | |
try | |
{ | |
moved = enumerator.MoveNext(); | |
} | |
catch (TMoveNextException ex) | |
{ | |
var transforemdException = catchOnMoveNext(ex); | |
if (ReferenceEquals(ex, transforemdException)) | |
{ | |
throw; | |
} | |
if (transforemdException is not null) | |
{ | |
throw transforemdException; | |
} | |
} | |
if (moved) | |
{ | |
yield return enumerator.Current; | |
} | |
} | |
while (moved); | |
} | |
} | |
/// <summary> | |
/// Handles the exception and returns either new one (can be same as received) or <c>null</c> - which means exception is handled and should not be | |
/// thrown. Enumerations ends in any case. | |
/// </summary> | |
public static IEnumerable<T> Catching<T>( | |
this IEnumerable<T> seq, | |
Func<Exception, Exception?> catchOnMoveNext) | |
=> | |
seq.Catching<T, Exception>(catchOnMoveNext); | |
} |
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