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oostadr
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C# TextBox values to x string array

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I have a textbox with the following values : 4,5,6,7,8,9,10,11,12,13,15
I want these values to be split into `x` string arrays with `y` values in each array.

For example extract into 3 arrays with 4 numbers in each :

int x = 3;
string[] batch;

batch[0] = "4,5,6,7"
batch[1] = "8,9,10,11"
batch[2] = "12,13,15"

For example extract into 5 arrays with 2 numbers in each :
int x = 5;
string[] batch;

batch[0] = "4,5"
batch[1] = "6,7"
batch[2] = "8,9"
batch[3] = "10,11"
batch[4] = "12,13"
batch[5] = "15"

I've tried Regex.split but I can't get it done... Please help

regex split array string
  • asked 2 years ago
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last answered 2 years ago

1 answers

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This method should do it though your second example should be 6 arrays (not 5) of 2 values. As you'll see, I've tried to adjust the arguments passed to the method so that an exception is never thrown:

private static string[][] GetBatches(string text, int x, int y)
 {
         if (x < 1) x = 1;
         if (y < 1) y = 1;
         if (text == null) text = "";   
         string[] elements = text.Split(',');            
         int len = elements.Length;
         if (x > len)
         {
            x = len;
            y = 1;
         }
         if (y > len)
         {
            x = 1;
            y = len;
         }     
         int last = y; // number in last batch
         if (x * y >  len)
         {
            y++;
            do
            { 
              y--;             
              last = y  - x * y  + len; // adjust last batch to fit
            }
            while (last < 0);           
         }
         else if (x * y < len)
         {
            last += len - x * y; // add surplus to last batch
         }        
         string[][] batch = new string[x][];
         for(int i = 0; i < x - 1; i++)
         {
            batch[i] = new string[y];
            Array.Copy(elements, y * i, batch[i], 0, y);
         }
         batch[x - 1] = new string[last];
         Array.Copy(elements, (x - 1) * y, batch[x - 1], 0, last);           
         return batch;   
}

and call with something like this:
string[][] batch = GetBatches(textBox1.Text, 3, 4);
string message = "";
for(int i = 0; i < batch.Length; i++)
{
     message += String.Format("batch[{0}] = \"{1}\"\r\n", i, String.Join(",", batch[i]));
}
MessageBox.Show(message);

(x)
oostadr
15

You're right it should have bin an array of 5 instead of 6. Thx for the answer, this will do.

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