OpenFileDialog's ShowDialog method reports an error

joker816

In a click event in asp.net, I use the following code:
        Stream myStream;
        OpenFileDialog openFileDialog1 = new OpenFileDialog ();

        openFileDialog1.InitialDirectory = "c:\\";
openFileDialog1.Filter = "txt files (* .txt) | * .txt | All files (*. *) | *. *";
        openFileDialog1.FilterIndex = 2;
        openFileDialog1.RestoreDirectory = true;

        if (openFileDialog1.ShowDialog () == DialogResult.OK)
        {
            if ((myStream = openFileDialog1.OpenFile ())! = null)
            {
                // Insert code to read the stream here.
                myStream.Close ();
            }
        }
This error is reported in openFileDialog1.ShowDialog ():
Before you can call OLE, you must set the current thread to single-threaded apartment (STA) mode. Make sure your Main function is tagged with STAThreadAttribute. This exception is only thrown by attaching a debugger to the process.

393736105

ShowDialog should be used in WinForm.
To display a file dialog in ASP.NET, you should use Java script.

lygzgs

Put a line like this in front of your main () function

[STAThread]

393736105

It seems that OpenFileDialog uses File (Input) in ASP.NET.

joker816

May
There is no main function in asp.net

joker816

There is a problem with file (input). When the file is larger than 20MB, the page cannot be displayed.

flash303

Add a line of this statement in front of your main() function
[STAThread]

Busster

I am C# and I also reported this error. How can I solve it?