C# GB2312 转 UTF-8

C# GB2312 转 UTF-8

byte[] buf = Encoding.GetEncoding(936).GetBytes(str);
Encoding e1 = Encoding.UTF8;
Encoding e2 = Encoding.GetEncoding(936);
string word = System.Web.HttpUtility.UrlEncode(Encoding.Convert(e2, e1, buf)); //gb2312->utf8

 C# code

string str = "优快云的天地"; 
str= HttpUtility.UrlEncode(str, Encoding.UTF8);