Merge two lines in eight ones

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I have dataGridView1 with two columns filled by data when click button1, data will be saved in a file, my code has many columns, how can I show only eight columns.

[Added from solution#2]

Input file:

Output file should look like this:

23,56 24,67 34,77 45,79
55,66 57,67 71,43 89,45
12,46 23,66

What I have tried:

private void button1_Click(object sender, EventArgs e)
        {
            string filePath = "grd.txt";
            using (StreamWriter sw = new StreamWriter(filePath, append: true))
            {
                StringBuilder result = new StringBuilder();
                sw.WriteLine($" {textBox1.Text}\t{dataGridView1.Rows.Count - 1}");
                // Iterate through each row in the DataGridView
                foreach (DataGridViewRow row in dataGridView1.Rows)
                {
                    // Iterate through each pair of columns (i.e., merge two columns into      eight columns)
                    for (int i = 0; i < dataGridView1.Columns.Count - 1; i += 2)
                    {
                        // Check if both columns have non-null values
                        if (row.Cells[i].Value != null && row.Cells[i + 1].Value != null)
                        {
                            // Combine the values from the pair of columns separated by a comma
                            string mergedValue = string.Format("{0},{1}",
                                row.Cells[i].Value.ToString(),
                                row.Cells[i + 1].Value.ToString());

                            // Append the merged value to the result string
                            result.Append(mergedValue + " ");
                        }
                    }
                }// Save the final result to file
                sw.WriteLine(result.ToString());
                
                
            }
        }

Posted 14-Nov-23 8:48am

essukki

Updated 15-Nov-23 4:44am

Maciej Los

v2

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Maciej Los · Accepted Answer · 2023-11-14T09:53:00

Have you tried to define columns?

C#

//define columns you want to export to text file
int[] colsToPrint = new int[]{1, 3, 5, 7, 9};
foreach (DataGridViewRow row in dataGridView1.Rows)
{
        // Iterate through defined columns
        foreach (int i in colsToPrint)
        {
             //your logic here
        }
}

[EDIT]
Accordingly to the solution#2 (added to the question)...
Imagine, you've got one-dimensional array and you want to "convert" it into multi-dimensional array.
Take a look at below example and read all coments carefully.

C#

string inputfile = @"D:\inputgrd.txt";
string outputfile = @"D:\outputgrd.txt";
//grab all lines into one-dimensional array
string[] items = File.ReadAllLines(inputfile);
//get the size of array
int j = items.Length;
//define new column count
int cc =  4;
//temporary variable needed to calculate rows count
int rr = j % cc;
//new rows count
int rc =  (int)(j / cc) + (rr==0 ? 0 : 1);  //use temporary variable
//define new array
string[,] a = new string[rc,cc];
//loop through the collection of items (items in array)
for(int i = 0; i < j; i++)
{
    int r = (int)i / 4;  //get row number
    int c = (int)i % 4;  //get column number
    //Console.WriteLine($"{i} => [{r},{c}]");
    //put item into proper cell of array
    a[r,c] = items[i];
}

//create an output file
StringBuilder sb = new StringBuilder();
for(int r = 0; r< rc; r++)
{
    //create new string
    string s = $"{a[r,0]} {a[r,1]} {a[r,2]} {a[r,3]}";
    Console.WriteLine(s);
    sb.AppendLine(s);
}
File.WriteAllText(outputfile, sb.ToString());

Note: It's just an example. You have to change it to your needs.