对于wx.getShareInfo解密缺少C#版本的解密

对于wx.getShareInfo得到的数据encryptedData和iv的解密缺少C#版本的解密，请管理员尽快的解决！！！

还有就是为啥自己写的如下的代码，执行会报错填充值无效，无法删除！！！！请大家给看看，这个如何解决？？？

RijndaelManaged rijndaelCipher = new RijndaelManaged();

//16进制数据转成byte类型

byte[] edata = Convert.FromBase64String(encryptedData);

rijndaelCipher.Key = Convert.FromBase64String(sessionKey);

rijndaelCipher.IV = Convert.FromBase64String(iv);

rijndaelCipher.Mode = CipherMode.CBC;

rijndaelCipher.BlockSize = 128;

rijndaelCipher.KeySize = 256;

rijndaelCipher.Padding=PaddingMode.PKCS7;

var transform= rijndaelCipher.CreateDecryptor();

byte[] plainText = transform.TransformFinalBlock(edata, 0, edata.Length);

string jieguo = Encoding.UTF8.GetString(plainText);