C＃通过单击按钮调用文件？

Question

I have a Form and a Class: Form1 & Timer

In Form1 I have a button that looks like this

public void browseSoundToolStripMenuItem_Click(object sender, EventArgs e)
{
    OpenFileDialog dialog1 = new OpenFileDialog();

    dialog1.Title = "Browse to find sound file to play";
    dialog1.InitialDirectory = @"c:\";
    dialog1.Filter = "Wav Files (*.wav)|*.wav";
    dialog1.FilterIndex = 2;
    dialog1.RestoreDirectory = true;

    //PlaySound(dialog1.FileName, new System.IntPtr(), PlaySoundFlags.SND_SYNC);             
}

In Timer.cs I have an Event that looks like this:

public void alert_sound(object source, ElapsedEventArgs e)
{
    MessageBox.Show("Alert Sound ding ding ding");

    //PlaySound(dialog1.FileName, new System.IntPtr(), Form1.PlaySoundFlags.SND_SYNC);
    alert_timer.Stop();
}

The problem is that in Timer.cs it says that dialog1 does not exist in the current context. How do I call dialog 1 from Form1 into my Timer class?

Answer 1

You have created the dialog1 variable in a scope local to the browseSoundToolStripMenuItem_Click event method. In order to access it from a different event you need to create it at the class level. Like this:

public partial class Form1 : Form
{
    OpenFileDialog dialog1 = new OpenFileDialog();


    public void browseSoundToolStripMenuItem_Click(object sender, EventArgs e)
    {
        dialog1.Title = "Browse to find sound file to play";
        dialog1.InitialDirectory = @"c:\";
        dialog1.Filter = "Wav Files (*.wav)|*.wav";
        dialog1.FilterIndex = 2;
        dialog1.RestoreDirectory = true;

        //PlaySound(dialog1.FileName, new System.IntPtr(), PlaySoundFlags.SND_SYNC);             
    }

    public void alert_sound(object source, ElapsedEventArgs e)
    {
        MessageBox.Show("Alert Sound ding ding ding");

        //PlaySound(dialog1.FileName, new System.IntPtr(), Form1.PlaySoundFlags.SND_SYNC);
    alert_timer.Stop();
    }

}

Answer 2

In your example, dialog1 needs to be declared at the module level. You declared it within the browseSoundToolStripMenuItem_Click() method, so dialog1 only has scope for that method.

Move this line:

OpenFileDialog dialog1 = new OpenFileDialog();

to the top of the form.

Answer 3

your going to have to store the filename in a variable that can be called by the other method.

string filename = dialog1.Filename;

Possible to use the filename variable as a class level variable, but that is a suggestion as I don't know anything about your class and its layout.