Question

I am getting a list of file names using the following code:

        //Set up Datatable
        dtUpgradeFileInfo.Columns.Add("BaseFW");
        dtUpgradeFileInfo.Columns.Add("ActiveFW");
        dtUpgradeFileInfo.Columns.Add("UpgradeFW");
        dtUpgradeFileInfo.Columns.Add("FileName");

        //Gets Upgrade information and upgrade Files from Upgrade Folder
        DirectoryInfo di = new DirectoryInfo(g_strAppPath + "\\Update Files");
        FileInfo[] rgFiles = di.GetFiles("*.txt");
        foreach (FileInfo fi in rgFiles)
        {
            test1 = fi.Name.ToString();


        }

All file names will be in the form BXXXX_AXXXX_UXXXX. Where of course the Xs represent a number 0-9, and i need those 3 grouping of just numbers to put each into their respective column in the Datatable. I was initially intending to get the characters that represent each grouping and putting them together for each grouping but i’m wondering if there is a better way/quicker way than sending it to a charArray. Any suggestions?

Answer 1

Here is a relatively simple way to get the numbers out of test1 (without LINQ):

...
string test1 = fi.Name.ToString();

int baseFW=0;
int activeFW=0;
int upgradeFW=0;

// Break the file name into the three groups
string[] groups=test1.Split('_');

if (groups.Length==3)
{
  // Create a numbers array to hold the numbers
  int[] nums=new int[groups.Length];

  // Parse the numbers out of the strings
  int idx=0;
  foreach (string s in groups)
    nums[idx++]=int.Parse(s.Remove(0,1)); // Convert to num 

  baseFW=nums[0];
  activeFW=nums[1];
  upgradeFW=nums[2];
}
else
{
  // Error handling...
}

If you want to do this using LINQ, it’s even easier:

...
string test1 = fi.Name.ToString();

int baseFW=0;
int activeFW=0;
int upgradeFW=0;

// Extract all numbers
int[] nums=test1.Split('_') // Split on underscores
                .Select(s => int.Parse(s.Remove(0,1))) // Convert to ints
                .ToArray(); // For random access, below

if (nums.Length==3)
{
  baseFW=nums[0];
  activeFW=nums[1];
  upgradeFW=nums[2];
}
else
{
   // Error handling...
}