How to call open file dialog?

Question

.NET

From some recent time

private void button1_Click(object sender, EventArgs e)
        {
                 FileDialog.ShowDialog();
        }

Started throwing exceptions

The current thread must be set to a single-threaded container (STA) thread for OLE calls to be possible.

He says to put [STAThread] before Main, which I actually have.
One identical problem was solved by the delegate and the invoke method

private delegate DialogResult ShowSaveFileDialogInvoker();
        private void button1_Click(object sender, EventArgs e)
        {
            ShowSaveFileDialogInvoker invoker = new ShowSaveFileDialogInvoker(FileDialog.ShowDialog);

            this.Invoke(invoker); // where this is a Form
        }

However, this does not solve my problem and the same exception pops up

Answer 1

Try:

var fileDialog = new OpenFileDialog();
if(fileDialog.ShowDialog()==DialogResult.OK) { //code }