In Form1, how to get a value from Main()?

Dave

Hi,

In button1_Click(), how can I get "aValue" from Main(), somthing like:

    static class Program
    {
        [STAThread]
        static void Main()
        {
            int aValue = 1;
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDe...
            Application.Run(new Form1());
        }
    }

    public partial class Form1 : Form
    {
        private void button1_Click(object sender, EventArgs e)
        {
            Console.WriteLine("aValue = " + aValue);
        }
    }

I will appreciated for your code, I am a beginner.

6 Replies

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Vulpes12y ago
Accepted answer
You can do it like this:

static class Program
{
internal static int aValue;

[STAThread]
static void Main()
{
aValue = 1;
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDe...
Application.Run(new Form1());
}
}

public partial class Form1 : Form
{
private void button1_Click(object sender, EventArgs e)
{
MessageBox.Show("aValue = " + aValue);
}
}

Note that Console.WriteLine doesn't work in a Windows Forms app unless you compile it as a console app.

0
Dave12y ago
Thank you again for your help!
0
Vulpes12y ago
Normally, a Windows Forms application doesn't have a console window attached and so statements such as Console.WriteLine are ignored.

However, if you right click on the project name in Solution Explorer, select Properties from the dropdown and then, under the Application tab, change the output type to Console application, a console will be attached and such statements will work fine.
0
Dave12y ago
Yes, that works now! Thank you so much.

One more thing:
Why I can also use Console.Writeline() in
private void button1_Click(object sender, EventArgs e)?
0
Vulpes12y ago
Sorry, I forgot to change aValue in that line to Program.aValue.
0
Dave12y ago
Thank you for your code.
I tried and got error in Form1 button1_Click():
The name 'aValue' does not exist in the current context
0