using (FileStream fileStream = File.OpenRead(path))//打开文件
{
Aes aes = this.GetAes();
using (CryptoStream cryptoStream = new CryptoStream(fileStream, aes.CreateDecryptor(), CryptoStreamMode.Read))
{
using (StreamReader streamReader = new StreamReader(cryptoStream))
{
result = streamReader.ReadToEnd();
}