public static async Task< Single?> UnpackNullableSingleValueAsync( Unpacker unpacker, Type objectType, String memberName, CancellationToken cancellationToken ) { if ( unpacker == null ) { SerializationExceptions.ThrowArgumentNullException( "unpacker" ); } if ( objectType == null ) { SerializationExceptions.ThrowArgumentNullException( "objectType" ); } if ( memberName == null ) { SerializationExceptions.ThrowArgumentNullException( "memberName" ); } #if ASSERT Contract.Assert( unpacker != null ); Contract.Assert( objectType != null ); Contract.Assert( memberName != null ); #endif // ASSERT // ReSharper disable once RedundantAssignment var ctx = default( UnpackerTraceContext ); InitializeUnpackerTrace( unpacker, ref ctx ); try { AsyncReadResult<Single?> result = await unpacker.ReadNullableSingleAsync( cancellationToken ).ConfigureAwait( false ); if ( !result.Success ) { SerializationExceptions.ThrowFailedToDeserializeMember( objectType, memberName, null ); } Trace( ctx, "ReadDirect", unpacker, memberName ); return result.Value; } catch ( MessageTypeException ex ) { SerializationExceptions.ThrowFailedToDeserializeMember( objectType, memberName, ex ); return default( Single? ); // never reaches. } }