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string pubkey = "<RSAKeyValue><Modulus>MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCZoqP0Ce
TVWB6lL7bdX4iilWEbr03hmgvoBTYO5rzTJEboVcdPwYMT6/qp
jLFfDCu3qytxf+WuRqJVCsw11m4EqypTeyKy3PhkybUG/IoCYE
FwQlq24kIyXQiWUdTJT6FhLDKSfEUqUHpENbXmDZBXM
+Hf4hsEDUKV2kkhRJsnwwID</Modulus><Exponent>AQAB</Exponent>
</RSAKeyValue>";
string s = "测试测试";
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
rsa.FromXmlString(pubkey);
rsa.FromXmlString(pubkey);
byte[] bytes = Encoding.Default.GetBytes(s);
var tmp = rsa.Encrypt(bytes, false);
var encryptstring = Convert.ToBase64String(tmp);
}