Using a method from a form

Question

0.00/5 (No votes)

See more:

Hi I'm writing a small program to communicate toa plc. I have the comms working fine on the main form.
Hi have created a user control which is used a few times on the main form. What i'm trying to do is use the comms method on the main form for comms on the user controls.
I know its a bit of a newby question.
Any ideas would be great

Chris

Posted 13-Sep-10 0:17am

chrisclarke11

Add a Solution

3 solutions

Solution 2

Thanks for that but is there a using namespace required before creating the "ISomeInterface" interface?

Posted 13-Sep-10 1:54am

chrisclarke11

Comments

Fredrik Bornander 13-Sep-10 9:22am

My code isn't a working example, it just shows a way to solve your problem.
I've excluded things like namespaces and using statements.
Just create your MainForm like you'd normally do and add the interface declaration just above it, that should do the trick.
And also, you should Accept the answers to the questions you post if you like them.

chrisclarke11 14-Sep-10 6:06am

Hi Fredrik

Thanks i've got a bit further but still cant access the methods from the main form.

Chris

chrisclarke11 15-Sep-10 6:00am

Spent a bit more time at it and got my head round it. Thanks again for all the help. Got it working now

Chris

Solution 3

I think I have a faster way to do -- just inject the control with a reference to the main form

C#

public partial class SomeControl: UserControl
{
    MainForm mainForm;
    // Other members go here
}

On the main form do this:

C#

public partial class MainForm : Form, ISomeInterface
{
    public MainForm()
    {
        InitializeComponent();
        someControl1.mainForm = this;
    }
    public void SendText(object sender, string text)
    {
        // Use the data from the caller here on the main form somehow
    }

}

Basically, you can access the control from main and the main from the control

Posted 13-Sep-10 4:27am

Ruselo Riva Asentista

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Fredrik Bornander · Accepted Answer · 2010-09-13T00:41:00

Adorn the MainForm with an interface, for example:

C#

public partial class MainForm : Form, ISomeInterface
{
    public MainForm()
    {
        InitializeComponent();
    }
    public void SendText(object sender, string text)
    {
        // Use the data from the caller here on the main form somehow
    }
}

Then, to allow the UserControls to call that code they need to be aware of the MainForm instance, typically this can be done by exposing a property on the UserControl:

C#

public partial class SomeUserControl : UserControl
{
    public SomeUserControl()
    {
        InitializeComponent();
    }
    public ISomeInterface SomeInstance { get; set; }
    private void DoSomething()
    {
        if (SomeInstance != null)
            SomeInstance.SendText(this, "Hello, world!");
    }
}

In order to hook that up, you can (for example) iterate through the controls of MainForm in it's constructor:

C#

public MainForm()
{
    InitializeComponent();
    foreach (Control control in Controls)
    {
        if (control is SomeUserControl)
            ((SomeUserControl)control).SomeInstance = this;
    }
}