Windows phone 7 代码分析显示不多次处理对象

我的密码是

{
    AesManaged aes = null;
    MemoryStream memoryStream = null;
    CryptoStream cryptoStream = null;

    try
    {
        Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(password, Encoding.UTF8.GetBytes(salt), 10000);

        aes = new AesManaged();
        aes.Key = rfc2898.GetBytes(32);
        aes.IV = rfc2898.GetBytes(16);

        memoryStream = new MemoryStream();
        cryptoStream = new CryptoStream(memoryStream, aes.CreateEncryptor(), CryptoStreamMode.Write);

        byte[] data = Encoding.UTF8.GetBytes(dataToEncrypt);
        cryptoStream.Write(data, 0, data.Length);
        cryptoStream.FlushFinalBlock();

        return Convert.ToBase64String(memoryStream.ToArray());
    }
    finally
    {
        if (cryptoStream != null)
            cryptoStream.Close();

        if (memoryStream != null)
            memoryStream.Close();

        if (aes != null)
            aes.Clear();
    }
}

我刚试过代码分析，它给了我

CA2202
Do not dispose objects multiple times 
Object 'memoryStream' can be disposed more than once in method 'EncryptDecrypt.Encrypt(string, string, string)'. 
To avoid generating a System.ObjectDisposedException you should not call Dispose more than one time on an object.

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但我的代码运行良好我创建了memoryStream和cryptoStream并在。。。但是我不明白为什么它会多次告诉我多个对象

IDisposable的指南规定，两次处理同一个对象不会对第二次产生任何影响

然而，并不是所有的实现都遵循这个准则，所以代码分析告诉您不要依赖它

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您的特定对象在这方面是安全的，因此您没有实际问题。

您应该使用

using

语句。（尽管它不能解决这个问题）