UTF-8（带BOM）：writer = New StreamWriter(FilePathName, True, System.Text.UTF8Encoding.UTF8)
UTF-8（不带BOM）：writer =New StreamWriter(FilePathName, True, New UTF8Encoding(False))
生成不带BOM头的UTF-8文件,布布扣,bubuko.com
原文：http://blog.csdn.net/wang_cel/article/details/29369871
