Anyone can help me, explaining the codes to me. Thank You.

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Anyone can explain to me the following, what does the do and mean?

C#

private string RandomString(int StrLength)
    {
        string CharsList = "abcdefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$%^&*";
        char[] chars = CharsList.ToCharArray();

        RNGCryptoServiceProvider cryptoGen = new RNGCryptoServiceProvider();
        byte[] ByteData = new byte[StrLength];
        cryptoGen.GetBytes(ByteData);

        StringBuilder ResultStr = new StringBuilder();
        foreach (byte byt in ByteData)
        {
            ResultStr.Append(chars[byt % chars.Length]);
        }
        return ResultStr.ToString();

    }

Posted 11-Feb-12 22:52pm

noname89757

Updated 11-Feb-12 22:54pm

Wayne Gaylard

v2

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2 solutions

Solution 1

All it does is generate a random string of bytes, made up of the upper and lower case letters, plus a few special characters.
It probably isn't much use - it starts well by using a strong random sequence generator, then throws away much of that data to generate it's string.

You could have got this pretty easily from MSDN: RNGCryptoServiceProvider.GetBytes Method[^] - so why are you asking? What part of it confuses you?

Posted 11-Feb-12 23:18pm

OriginalGriff

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Shahin Khorshidnia · Accepted Answer · 2012-02-11T23:29:00

Hello,

C#

private string RandomString(int StrLength) //A method to generate a random string which its lenght is StrLength.

{
        string CharsList = "abcdefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$%^&*"; //Clear
        char[] chars = CharsList.ToCharArray(); //Converts CharsList to a Char array. for example: char[0]='a', char[1] = 'b', char[25]= 'z' and ....
 
        RNGCryptoServiceProvider cryptoGen = new RNGCryptoServiceProvider(); //Creates a new instance of the RNGCryptoServiceProvider. It's a Random Number Generator.
 
        byte[] ByteData = new byte[StrLength]; //Creates an byte array to hold the random value. Its lenght is equal to CharsList.Lenght

        cryptoGen.GetBytes(ByteData); // Fills the array (ByteData) with a random value.

 
        StringBuilder ResultStr = new StringBuilder(); //Creates an instance of StringBuilder to create dynamic strings and avoid unnecessary garbage collection. 
//It's better than: 
// string ResultStr = string.Empty;
//foreach (byte byt in ByteData)
//{
//            ResultStr += chars[byt % chars.Length];
//}

        foreach (byte byt in ByteData)//Measuring Generated array (ByteData) 
        {
            ResultStr.Append(chars[byt % chars.Length]);//Packing generated chars as a string.
// [byt % chars.Length] for creating a number >= 0 and < StrLenght
        }
        return ResultStr.ToString(); //It's crystal clear !
 
}