How to GetBytes() in C# with UTF8 encoding with BOM?

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Try like this:

public ActionResult Download()
{
    var data = Encoding.UTF8.GetBytes("some data");
    var result = Encoding.UTF8.GetPreamble().Concat(data).ToArray();
    return File(result, "application/csv", "foo.csv");
}

The reason is that the UTF8Encoding constructor that takes a boolean parameter doesn’t do what you would expect:

byte[] bytes = new UTF8Encoding(true).GetBytes("a");

The resulting array would contain a single byte with the value of 97. There’s no BOM because UTF8 doesn’t require a BOM.

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