StreamWriter and UTF-8 Byte Order Marks

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As someone pointed that out already, calling without the encoding argument does the trick.
However, if you want to be explicit, try this:

using (var sw = new StreamWriter(this.Stream, new UTF8Encoding(false)))

To disable BOM, the key is to construct with a new UTF8Encoding(false), instead of just Encoding.UTF8Encoding. This is the same as calling StreamWriter without the encoding argument, internally it’s just doing the same thing.

To enable BOM, use new UTF8Encoding(true) instead.

Update: Since Windows 10 v1903, when saving as UTF-8 in notepad.exe, BOM byte is now an opt-in feature instead.

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