Convert string to byte array c#

Question

I obtained a byte array using File.ReadAllBytes(); and I converted it into a string (s).

I converted my byte array to simple string using this code:

        string name;
        string s;
        byte[] bytes;

        bytes = File.ReadAllBytes(name);
        foreach (byte b in bytes)
        {
            s = s + b + ".";
        }

Now s is something like "255.0.0.12.100.4.24.40.0.0.200". Now I want to convert this string into a file. Using s.Split('.') I can get all the individual numbers. But how can I copy all the bytes into a file? (reconstruct the original file)

File.ReadAllBytes doesn't return a string[] - it returns a byte[]. Please give a minimal reproducible example - at the moment your question doesn't make much sense. (It would without the last sentence - at which point I'd just suggest array.Select(x => byte.Parse(x)).ToArray()...) — Jon Skeet
– Jon Skeet, Commented Jan 20, 2016 at 17:06

sr28 · Accepted Answer · 2016-01-20 17:15:14Z

1

I'm a little confused by your string array being filled with File.ReadAllBytes(), as this returns a byte[] not a string[]. However, that aside and focusing more on your desire to have a string[] converted to a byte[] you could do something like this (assumes your string[] is called 'str'):

byte[] MyByteArray = str.Select(s => Byte.Parse(s)).ToArray();

answered Jan 20, 2016 at 17:15

sr28

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Comments

adv12 · Accepted Answer · 2016-01-20 17:06:28Z

Assuming that you want to convert each string into a single byte (parse the string), here's a small program that should demonstrate how to do what you're looking for:

void Main()
{
    string[] vals = new string[10];
    // populate vals...
    byte[] bytes = new byte[vals.Length];
    int i = 0;
    foreach (string s in vals)
    {
        bytes[i++] = byte.Parse(s);
    }
}

Note that there's no error handling here for the case where the string doesn't parse properly into a byte; in that situation you'll get an exception from the byte.Parse method.

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