C#中通过FromXmlString属性加载的是XML形式,而JAVA中用到的是解析后的PEM格式的字符串,总之读取证书中信息无非是转换方式问题

/// <summary>
    /// c# 使用 java 的公钥进行rsa加密 utf8编码  通过解析公钥加密数据
    /// </summary>
    /// <param name="publickey"></param>
    /// <returns></returns>
    public static string RSAEncrypts(string content)
    {

      RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
      byte[] cipherbytes;
      X509Certificate2 x509Certificate2 = new X509Certificate2("D:\\【本文由http://www.nextecloud.cn/hk.html首发,转载请保留出处，谢谢】Config\\dsptest.cer");
      //创建并返回当前算法对象的xml字符串表示形式
      string publicKeyString = x509Certificate2.PublicKey.Key.ToXmlString(false);
      rsa.FromXmlString(publicKeyString);
      //rsa.FromXmlString(RSAPublicKeyJava2DotNet(publicKeyString));
      cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(content), false);
      return Convert.ToBase64String(cipherbytes);  
    }

      /// <summary>
      /// 私钥解密 通过解析私钥来解析数据 X509KeyStorageFlags.Exportable这个属性很关键是获取私钥信息的
      /// </summary>
      /// <param name="privatekey"></param>
      /// <param name="content"></param>
      /// <returns></returns>
     public static string RSADecrypt( string content)
    {
      byte[] rgb = Convert.FromBase64String(content);
      RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
      byte[] cipherbytes;
      X509Certificate2 x509Certificate2 = new X509Certificate2("D:\\Config\\test.pfx", "cfca1234", X509KeyStorageFlags.Exportable);
      //创建并返回当前算法对象的xml字符串表示形式
      //rsa.FromXmlString(RSAPrivateKeyJava2DotNet(Const.privatekey));

      rsa.FromXmlString(x509Certificate2.PrivateKey.ToXmlString(true));
      cipherbytes = rsa.Decrypt(Convert.FromBase64String(content), false);
      return Encoding.UTF8.GetString(cipherbytes);      
    }

/***************以下是java提供的公私钥转成.net公私钥XML的方式*************************************/
/// <summary> 
/// RSA公钥格式转换，java->.net
/// </summary>
/// <param name="publicKey">java生成的公钥</param>
/// <returns></returns>
public static string RSAPublicKeyJava2DotNet(string publicKey)
{
RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));
return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",
Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),
Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));
}

/// <summary>
/// RSA私钥格式转换，java->.net
/// </summary>
/// <param name="privateKey">java生成的RSA私钥</param>
/// <returns></returns>
public static string RSAPrivateKeyJava2DotNet(string privateKey)
{
 RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));

return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>",
Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned()));

}

以上实例大家可以测试下，感谢大家对海外IDC网的支持。