Transfering data between two open forms - from a child to a parent

Question

4.00/5 (1 vote)

See more:

I am trying to create a Find function in a richTextBox object,
So... the child form is the find form,
and the parent form is the richTextBox's form, and i want to transfer a simple integer from the child to the parent, is it possible anyhow...?

Form1.cs's event - when clicking on the find option in the main form

C#

private void findToolStripMenuItem_Click(object sender, EventArgs e)
{
    string textBlock = richTextBox1.Text;
    Form2 f = new Form2(textBlock);
    f.Show();
    //--------------------------------------------------//
    // if(the button was clicked and the word was found)
    //--------------------------------------------------//
    {
        richTextBox1.Focus();
        richTextBox1.Select(f.getLocation(), f.getEndLocation());
    }
}

Form2.cs's event-when clicking on the find button after you wrote the keyword

C#

private void find_btn_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length == 0) { }
            else
                if (this.textBlock.Length == 0)
                { MessageBox.Show("Cannot find '" + textBox1.Text + "'"); }
                else
                {
                    Boolean flag = false;
                    int i;
                    string[] Arr = textBox1.Text.Split('\n');
                    for (i = 0; (i < Arr.Length && !flag); i++)
                    {
                        flag = (findInContext(Arr[i]));
                    }
                    if (flag)
                    {
                        MessageBox.Show("The item was found on line " + i);
                        this.location = this.textBlock.IndexOf(textBox1.Text);
                        this.endLocation = this.location + textBox1.Text.Length;
                    }
                    else
                    MessageBox.Show("Cannot find '" + textBox1.Text + "'");
                }
        }

By the way - if you have any better algorithms for solving this problem- i'll be grateful if you post them...

Posted 23-Mar-11 10:52am

Eliran93

Updated 23-Mar-11 10:56am

v3

Add a Solution

3 solutions

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)

Sergey Alexandrovich Kryukov · Answer 1 · 2011-03-23T12:22:00

Solution 2

Forms cannot be child and parent: they only can be owner and owned, which is a huge difference. I also advice you should always support ownership (even though it is optional). It helps the user while doing Ctrl+Alt+Tab.

For passing data, you should use Form property. The setter of the property (like integer one) can also reflect the change in the form appearance. As an advanced technique (good in more complex cases) use some interface implemented by the form receiving data. It absolutely does not matter which form is the owner of which.

—SA

Posted 23-Mar-11 12:22pm

Sergey Alexandrovich Kryukov

Comments

fcronin 23-Mar-11 19:56pm

Agree on form property, best bet.

Sergey Alexandrovich Kryukov 23-Mar-11 20:01pm

Thank you.
--SA

Toli Cuturicu 24-Mar-11 9:22am

Forms can be MDI Child and MDI Parent, though.

Sergey Alexandrovich Kryukov 24-Mar-11 12:08pm

Oh, sure. I didn't even consider those. You see, several times I already denied to answer any questions on MDI. Instead I write "Never use MDI!" :-)
Thank you very much for the note, you're right.
--SA

luisnike19 · Answer 2 · 2011-03-23T11:23:00

Solution 1

Check this

http://stackoverflow.com/questions/706326/sending-data-from-child-form-to-parent-form-textbox[^]

Posted 23-Mar-11 11:23am

luisnike19

fcronin · Answer 3 · 2011-03-23T13:49:00

If you need the integer in the owner, the cleanest way I can think of is to create a public member on the 'owned' form, then access that once the find form is closed.

If you need the integer without closing the find form, research raising events and consume that event on the owner.

Here's what I normally do with search functionality... I like to show in the original control where the text is found as it is found... so, I would pass a reference of the richeditbox in the find form's constructor... then you can highlight where the text was found etc in the control itself.

Hope that gives you an idea of your options at least.