How Can I Prevent StreamWriter from Closing the Underlying BaseStream?

Stream operation: Disassociate StreamWriter from BaseStream

There is a dilemma when using StreamWriter and its Close() or Dispose() methods: these methods also close their underlying BaseStream. Problems arise if external components still need to access StreamWriter after BaseStream has completed its task.

To solve this problem, .NET Framework 4.5 and later provides an overloaded StreamWriter constructor that allows you to specify that the BaseStream remains open:

StreamWriter(Stream stream, Encoding encoding, bool leaveOpen)

This constructor accepts the third parameter leaveOpen, which defaults to false. By setting leaveOpen to true, you ensure that when StreamWriter is closed or released, BaseStream remains open.

In earlier versions of the .NET Framework (prior to 4.5), since this overloaded constructor does not exist, the following methods can be used:

• Avoid releasing StreamWriter: Don’t release StreamWriter, just empty it. This will release any buffered data without closing BaseStream.
• Create a flow wrapper : Implement a custom flow wrapper that ignores Close() and Dispose() calls while proxying all other operations to the underlying BaseStream.

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