如何把utf8转成ascii码？

[ss3idx]

从网上找到以下的代码，但转换结果还是不对

Encoding utf8 = Encoding.UTF8;

byte[] utf8Bytes = utf8.GetBytes("严");
byte[] asciiBytes = Encoding.Convert(utf8, ascii, utf8Bytes);

char[] asciiChars = new char[ascii.GetCharCount(asciiBytes, 0, asciiBytes.Length)];
ascii.GetChars(asciiBytes, 0, asciiBytes.Length, asciiChars, 0);
string asciiString = new string(asciiChars);

[子夜__]

ASCIIEncoding.ASCII.GetBytes()

[xuexiaodong2009]

双字节的你这样处理，肯定不能还原的，你试试单字节应该是没有问题的
string asciiString = new string(asciiChars);

[anbam]

byte[] utf8Bytes = utf8.GetBytes("严");

return ASCIIEncoding.ASCII.GetString(utf8Bytes );