Copy to clipboard (different thread)

[konrad]

Hello,

I open the window containing RadGridView as follows:

new System.Threading.Thread(delegate () {

  FormReports FormReports = new FormReports();
  FormReports.ShowDialog();
}).Start();

When trying to copy data from the grid (right click -> copy) error message pops up:

An unhandled exception of type 'System.Threading.ThreadStateException' occurred in System.Windows.Forms.dll

Additional information: Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it.

In this case I can't avoid new thread when calling new form.

How to solve it?​

 




new System.Threading.Thread(delegate () { 

  FormReports FormReports = new FormReports();

  FormReports.ShowDialog();

}).Start();

[Dess | Tech Support Engineer, Principal]

Hello Dominik,

Thank you for writing.

It does not seem to be an issue RadGridView. When you copy data from , we use Clipboard.SetDataObject method. If it is called from another thread, the mentioned exception occurs. This problem can be reproduced with the default WinForms controls as well without using any Telerik component: 

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        new System.Threading.Thread(delegate()
        {
            Form f = new Form();
            Button b = new Button();
            f.Controls.Add(b);
            b.Click += b_Click;
            f.ShowDialog();
        }).Start();
    }

    private void b_Click(object sender, EventArgs e)
    {
        Clipboard.SetDataObject("test");
    }
}

You can find additional information on this topic on the following links:

http://stackoverflow.com/questions/16705124/clipboard-task-error
http://stackoverflow.com/questions/3546016/how-to-copy-data-to-clipboard-in-c-sharp

I hope this information helps. Should you have further questions I would be glad to help.

 

Regards,
Dess
Telerik