如何从字节数组创建文件并将其作为文件发送到流中，而无需在磁盘上创建此文件？

Question

是否可以从字节数组创建文件并将其作为文件直接发送到流，而无需在磁盘上创建此文件？

Answer 1

There is a MemoryStream class that takes a byteArray as argument. You don't need to write a file.

Stream stream = new MemoryStream(byteArray);

Alternatively, you can Write to an existing MemoryStream :

memStream.Write(byteArray, 0 , byteArray.Length);

Answer 2

Your question is not very clear. You are asking to "create a file" and yet you are saying "without creating this file on disk". However it is possible to either "create a file from a byte array" :

File.WriteAllBytes( path, bytes );

where path is the filename to create and bytes is the byte[] to write - this is just one of those many ways.

Or "send to a stream without creating file on disk". ie: Write to MemoryStream:

var ms = new MemoryStream( bytes );

I am afraid your question needs to be more specific on what you are trying to do.

Edit: Crypto sample:

private static byte[] Crypt
  (byte[] data, byte[] key, byte[] iv, ICryptoTransform cryptor)
{
  MemoryStream m = new MemoryStream();
  using( Stream c = new CryptoStream(m, cryptor, CryptoStreamMode.Write ))
  {
    c.Write(data, 0, data.Length);
  }
  return m.ToArray();
}

public static byte[] Encrpyt(byte[] data, byte[] key, byte[] iv)
{
  using( Aes algorithm = Aes.Create())
  using( ICryptoTransform encryptor = algorithm.CreateEncryptor(key,iv))
  {
    return Crypt( data, key, iv, encryptor );
  }
}