c＃-创建XML并将其另存为UTF-8（无BOM）

Question

我需要以UTF-8编码保存xml文件，但是当我在notepad ++中签入时，编码为UTF-8 BOM。我如何强制使编码为UTF-8。我的代码如下：

XmlWriterSettings settings = new XmlWriterSettings();
settings.Encoding = Encoding.UTF8;
XmlWriter writer = XmlWriter.Create(tempPath, settings);
xdoc.Save(writer);