C# CryptoStream实例关闭时引发异常

我有一个使用RijndaelManaged密码的DecryptString函数。它在99.999%的时间内工作，但当它试图关闭finally块中的加密流时，偶尔会抛出一个“IndexOutofFrangeException”异常，消息为“Index超出了数组的边界”

当它停止工作时，它将停止工作20分钟左右，然后开始工作 在没有明显解释的情况下再次工作。我确实有一个线索，那就是

public string DecryptString(string InputText, string Password)
        {
            //checkParamSupplied("InputText", InputText);
            checkParamSupplied("Password", Password);

            MemoryStream memoryStream = null;
            CryptoStream cryptoStream = null;

            try
            {
                RijndaelManaged RijndaelCipher = new RijndaelManaged();

                byte[] EncryptedData = Convert.FromBase64String(InputText);

                byte[] Salt = Encoding.ASCII.GetBytes(Password.Length.ToString());

                PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(Password, Salt);

                // Create a decryptor from the existing SecretKey bytes.
                ICryptoTransform Decryptor = RijndaelCipher.CreateDecryptor(SecretKey.GetBytes(32), SecretKey.GetBytes(16));

                memoryStream = new MemoryStream(EncryptedData);

                // Create a CryptoStream. (always use Read mode for decryption).
                cryptoStream = new CryptoStream(memoryStream, Decryptor, CryptoStreamMode.Read);

                // Since at this point we don't know what the size of decrypted data
                // will be, allocate the buffer long enough to hold EncryptedData;
                // DecryptedData is never longer than EncryptedData.
                byte[] PlainText = new byte[EncryptedData.Length];

                // Start decrypting.
                int DecryptedCount = cryptoStream.Read(PlainText, 0, PlainText.Length);

                // Convert decrypted data into a string. 
                string DecryptedData = Encoding.Unicode.GetString(PlainText, 0, DecryptedCount);

                // Return decrypted string.   
                return DecryptedData;
            }
            catch (Exception ex)
            {
                throw;
            }
            finally
            {
                //Close both streams.
                memoryStream.Close();
                cryptoStream.Close();
            }
        }

---

我注意到的一件事是，在您的

finally

块中关闭加密流之前，您正在关闭加密流的底层流-也许您应该反转这两个语句？

Jonathan-您的问题不完整…文本和代码似乎都被切断了…谢谢，我的浏览器正在播放。我已经添加了代码的其余部分。问题仍然被截断though@Jonathan斯坦顿-我在一条类似的船上，同一个代码会产生随机错误。“我有一个潜在客户（被截断）”是什么？你找到解决方案了吗？可能。使用块将它们包装（嵌套）也可以防止这种混淆和错误。