How to create dataGridView with Parallel for using C# winform?

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I'm new to Parallel programming. I' trying to populate column header and row-header of a dataGridView with numbers using parallel For loop. But I'm getting every time different error when ever run the program:

"Index was outside the bounds of the array."

"This operation cannot be performed while the DisplayIndex of a column is being adjusted."

Could anyone please fix this problem?

C#

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Threading.Tasks;


namespace DataGridView
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
            Parallel.For(0, 1000, k =>
                        {

                            dataGridView1.Columns.Add("", k.ToString());// Adding column during run-time and populating
                            dataGridView1.Rows.Add();// Adding row during run-time
                            dataGridView1.Rows[k].HeaderCell.Value = k.ToString();// To populate row headers
                        });            
        }
    }
}

Posted 2-May-14 16:44pm

Member 9794576

Updated 2-May-14 17:29pm

v6

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DamithSL · Answer 1 · 2014-05-02T17:13:00

to fix "Index was outside the bounds of the array." error, you can use return value of Rows.Add as below

C#

int rowindex = dataGridView1.Rows.Add();
dataGridView1.Rows[rowindex].HeaderCell.Value = k.ToString();

But, This is not a good user case for Parallel.ForEach. you may need to use BeginInvoke and also do this in some other event like button click, then your datagridview loaded and you will not get exception.

C#

private void button1_Click(object sender, EventArgs e)
{
    Parallel.For(0, 5, k =>
    BeginInvoke(new Action(() =>
    {
        dataGridView1.Columns.Add("", k.ToString());
        int index = dataGridView1.Rows.Add();
        dataGridView1.Rows[index].HeaderCell.Value = k.ToString();
    })));   
}