CODEWITHSUNDEEP
c#
Slavik Ribz
Slavik Ribz

Reputation: 165

Calling a function from another form c#

i have a main form with a function that changes the text of a text box thats on the main form, the code is below:

main form function:

    public void consoleLog(string message)
    {
        txtConsoleLog.Text += Environment.NewLine;
        txtConsoleLog.Text += message;
        txtConsoleLog.SelectionStart = txtConsoleLog.TextLength;
        txtConsoleLog.ScrollToCaret();
        txtConsoleLog.Refresh();
    }

So now i open a new form called frm connect when i click a button like this:

    private void connectToolStripMenuItem_Click(object sender, EventArgs e)
    {
        Form frmConnect = new FrmConnect(this);
        frmConnect.Show();
    }

this is the frmConnect below

public partial class FrmConnect : Form
{
    private Form mainForm;

    public FrmConnect(Form frmMain)
    {
        this.mainForm = frmMain;
        InitializeComponent();
    }

    private void btnConnect_Click(object sender, EventArgs e)
    {
        FrmMain.Connected = true;
        mainForm.consoleLog("Connected");
    }
}

So when i click a button i want to call the function but its saying it doesnt contain a definition for it, also im trying to change the 'Connected' variable thats on the main form which works by just referencing the FrmMain but am i able to do that using mainForm.Connected = true?

If i change the function to public static, it will work by referencing FrmMain but then i get errors with the txtConsoleLog as i cant reference an object in a non static method or something like that, any help is appriciated

Upvotes: 0

Views: 145

Answers (2)

Dan Field
Dan Field

Reputation: 21641

You should change 

private Form mainForm;

public FrmConnect(Form frmMain)
{

To

private FrmMain mainForm;

public FrmConnect(FrmMain frmMain)
{

which will later give you access to all of the public properties on FrmMain in your other methods in the FrmConnect class.

Upvotes: 0

krillgar
krillgar

Reputation: 12805

When you pass the form into your constructor, and store it as the private member variable, in both places you declare it of the base type Form. In order to use a method on the type that you defined, your parameter and variable should be of type FrmMain.

public partial class FrmConnect : Form
{
    private FrmMain mainForm;

    public FrmConnect(FrmMain frmMain)
    {
        this.mainForm = frmMain;
        InitializeComponent();
    }

    private void btnConnect_Click(object sender, EventArgs e)
    {
        FrmMain.Connected = true;
        mainForm.consoleLog("Connected");
    }
}

Upvotes: 1

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