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I have a file (D:/d.txt) that I'm converting to a byte array and then encrytping the array with RC4 

 string filename="D:/d.txt" byte[] buff = null; FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read); BinaryReader br = new BinaryReader(fs); long numBytes = new FileInfo(fileName).Length; buff = br.ReadBytes((int) numBytes); return buff;

but now I want to convert the array back to a file how can I do that

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  • Just open a file and write it to the file. Commented Dec 6, 2014 at 14:01
  • You should really have fs in a using block, you are not closing the FileStream you opened to read the file. Also all of your code could be replaced with return File.ReadAllBytes("D:/d.txt"); Commented Dec 6, 2014 at 17:25

1 Answer 1

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try this:

 string filename = "D:/d.txt"; byte[] buff = null; FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read); BinaryReader br = new BinaryReader(fs); long numBytes = new FileInfo(filename).Length; buff = br.ReadBytes((int) numBytes); File.WriteAllBytes("Foo.txt", buff); // or File.WriteAllBytes("Foo.txt", buff.ToArray());

Documentation

System.IO.File.WriteAllBytes - MSDN

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