将字符串转换为字节数组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)

Answer 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();

Answer 2

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.