public static string GetParentFolder(string path, byte levels = 1, string targetFolder = null)
{
// Given "C:\Parent\Child\" or "C:\Parent\Child\MyFile.txt", return "C:\Parent". If a target has
// been provided, stop when the target folder is found. For example:
// GetParentFolder("C:\\one\\two\\three\\four\\five\\test.txt", 50, "three")
// returns "C:\\one\\two\\three".
string parent = path;
levels = MathLibrary.Clamp <byte>(levels, 1, 100);
byte level = 0;
while ((level < levels) && (parent.Length > 0))
{
DirectoryInfo dir = new DirectoryInfo(parent);
if (dir.Parent != null)
{
parent = dir.Parent.FullName;
if ((!string.IsNullOrEmpty(targetFolder)) && (parent.EndsWith(targetFolder)))
{
break;
}
else
{
level++;
}
}
else
{
break;
}
}
return(parent);
}
public static string GetRandomString(byte length, bool lettersOnly, bool removeIllegal = false, int seed = 0)
{
// Generate a randomised string
string sRandom = string.Empty;
length = MathLibrary.Clamp <byte>(length, 1, 100);
// Assign allowed characters to a temporary array
byte start, end, character;
List <char> allowed = new List <char>();
List <char> forbidden = new List <char>();
if (lettersOnly)
{
// Lowercase letters only
start = 97; // a
end = 122; // z
}
else
{
// Any printable ASCII character
start = 33; // !
end = 126; // ~
// Remove illegal characters? Use if the random string will be used to create a file/folder in
// the file system. Forbidden printable ASCII characters are:
// * Windows: \ / : * ? " < > |
// * MacOS: :
// * Linux: /
if (removeIllegal)
{
// Use the Windows superset because it covers MacOS and Linux too
forbidden.Add('\\');
forbidden.Add('/');
forbidden.Add(':');
forbidden.Add('*');
forbidden.Add('?');
forbidden.Add('"');
forbidden.Add('<');
forbidden.Add('>');
forbidden.Add('|');
}
}
if (forbidden.Count > 0)
{
for (character = start; character <= end; character++)
{
if (!forbidden.Contains((char)character))
{
allowed.Add((char)character);
}
}
}
else
{
for (character = start; character <= end; character++)
{
allowed.Add((char)character);
}
}
// Create a random number generator (with optional seed for performance and test)
Random rnd;
if (seed == 0)
{
Thread.Sleep(1); // Ensure that calls made in close succession have different seeds
rnd = new Random();
}
else
{
rnd = new Random(seed);
}
// Build randomised string
for (character = 0; character < length; character++)
{
sRandom += allowed[rnd.Next(int.MaxValue) % allowed.Count];
}
return(sRandom);
}
