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C# .NET 4.5 - Updating Winforms GUI from background threads

Posted on 2014-01-21
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Last Modified: 2014-02-04
Hey all,

Using .Net 4.5, I want to update a datagrid control to display the contents of multiple CSV files. Each CSV file will be one line of the datagrid.

I am confident in reading and processing the CSV files, but I don't know how to do this in a background thread that can update the datagrid on the GUI.

What is the best way to do this in the latest .net framework?

Any guidance appreciated. Thankyou.
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Question by:mhdi
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by:
Barry Cunney earned 450 total points
ID: 39799613
Hi mhdi,
There is a BackgroundWorker Class in namespace System.ComponentModel - .Net 4.5

The following is not full code, but will give you an idea of how the above can potentially be used in your situation
 
// Instantiate new background worker object
BackgroundWorker bw_Display_File_Content = new BackgroundWorker();


// Specify that the background worker can be cancelled and also can report progress
bw_Display_File_Content.WorkerSupportsCancellation = true;
bw_Display_File_Content.WorkerReportsProgress = true;



// Do the actual work of getting file content
private void bw_DoWork(object sender, DoWorkEventArgs e)
{
    BackgroundWorker worker = sender as BackgroundWorker;

    string[] files = Directory.GetFiles(txtFolderPath.Text, "*.csv");
    int row = 0;

    // Loop through each file
    foreach (string file in files)
    {
        if ((worker.CancellationPending == true))
        {
            e.Cancel = true;
            break;
        }
        else
        {
            // Perform the work and report progress.
           
            // Read file and add to data grid
            using (StreamReader sr = new StreamReader("FilePath"))
            {
                

                 string[] file_content = sr.ReadToEnd()
                 dataGridView1.Rows.Add(); 
                 dataGridView1[0, row].Value = file_content

               
                    
             }
            
	   
            worker.ReportProgress((i * 10));
        
           
            }
       

           row++;

       }
}



private void buttonStart_Click(object sender, RoutedEventArgs e)
{
    if (bw_Display_File_Content.IsBusy != true)
    {
        bw_Display_File_Content.RunWorkerAsync();
    }
}



private void w_Display_File_Content_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    this.tbProgress.Text = (e.ProgressPercentage.ToString() + "%");
}

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LVL 70

Assisted Solution

by:Éric Moreau
Éric Moreau earned 50 total points
ID: 39799749
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