将值从一种形式发送到另一种形式而不返回到形式 1

Question

I've been trying to figure out how to have a user input a string into a text box in Form1 and then hit a "Done" button and display Form2 with a Label containing the text from the text box in Form1.

I had come across this question which almost solved my problem ( Send values from one form to another form ) but the answer to the above question showed you how to hit a button, display Form2, then input a string, and hit another button returning to form 1 where the label displayed the text inputted in Form2.

I want to be able to input the string into a text box in Form 1 and when you hit a button display Form 2 with the label containing the string from the text box in Form 1.

I've spent a good hour or so trying to deconstruct the tiny bit of code from the linked question and get it to work how I want, but I just can't seem to understand it. If theres anyone who could either explain how to get a label in Form2 to contain a string from a text box in Form1 or show me the code necessary so I may look over it and understand it, it'd be greatly appreciated. As I currently cannot seem to get a grasp of how the code works in the previous question I linked.

This is the bit of code I used from the above linked question

// Form 1
// inside the button click event
using(Form2 form2 = new Form2()) 
{
    if(form2.ShowDialog() == DialogResult.OK) 
    {
        someControlOnForm1.Text = form2.TheValue;
    }
}

And...

// Inside Form2
// Create a public property to serve the value
public string TheValue 
{
    get { return someTextBoxOnForm2.Text; }
}

Answer 1

In m understanding you want to get around with the data across forms?

If you want to get the data and retrieve it forms you can try this

Create a class name called Globals

public class Globals
{
private static string _myData;
public static string MyData
{
    get
    {
        // Reads are usually simple
        return _myData;
    }
    set
    {
        _myData = value;
    }
 }

}

in your Form1 set a value in a global variable

Globals.myData = "someText"; //set the value

in your Form2 get the value

//example we have a lable
label1.Text = Globals.myData //this returns the value "someText"

Answer 2

You can try something like this

In Form2

public void SetText(string text)
    {
        this.label1.Text = text;
    }

And In Form1

private void Form1Button1_Click(object sender, EventArgs e)
    {
        using (Form2 form2 = new Form2())
        {
            form2.SetText(this.textBox1.Text);
            form2.ShowDialog();
        }
    }

If you don't want a modal dialog then change the Form1 code like below

Form2 form2 = new Form2();
    public Form1()
    {
        InitializeComponent();
    }
private void Form1Button1_Click(object sender, EventArgs e)
    {
        form2.SetText(this.textBox1.Text);
        form2.Show();
    }

Answer 3

1. Create Form1 with a label ( label1 ) and a button ( button1 )
2. Create Form2 with a textbox ( textBox1 )

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Button1_Click(object sender, EventArgs e)
        {
            Form2 form2 = new Form2(this.SetTextFromForm2, label1.Text);
            form2.ShowDialog();
        }

        private void SetTextFromForm2(string str)
        {
            label1.Text = str;
        }
    }
}

Explain :

Form2 form2 = new Form2(this.SetTextFromForm2, label1.Text);

Send 2 informations to Form2 : method to change Text of label on Form1, and current text of that label

Form2.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

public delegate void SetTextToForm1(string str);

namespace WindowsFormsApp1
{

    public partial class Form2 : Form
    {
        public SetTextToForm1 setTextToForm1 { get; set; }

        public Form2(SetTextToForm1 SetTextMethod, string strTextFromForm1)
        {
            InitializeComponent();

            this.setTextToForm1 = SetTextMethod;
            this.textBox1.Text = strTextFromForm1;
        }

        private void TextBox1_TextChanged(object sender, EventArgs e)
        {
            setTextToForm1(textBox1.Text);
        }
    }
}

Explain :

public delegate void SetTextToForm1(string str);

"A delegate is a reference type variable that holds the reference to a method"

setTextToForm1(textBox1.Text);

Call Form1's method to change text of label on Form1

---

Answer your question :

This bit of code did basically exactly what I'm looking for, but do you know if theres any way to essentially reverse it? I see when you input text into the textBox in Form 2 it does put that into the label, so it works perfectly. But is there a way to have the text box in Form 1 and when you hit the button just have Form 2 pop up with the label containing the text from the text box in Form 1?

1. Create Form1 with a textbox (textBox1) and a button (button1)
2. Create Form2 with a label (label1)

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

public delegate void SetTextToForm2(string str);

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        Form2 form2 = new Form2();

        public SetTextToForm2 setTextToForm2 { get; set; }

        public Form1()
        {
            InitializeComponent();

            setTextToForm2 = form2.SetTextFromForm1;
        }

        private void TextBox1_TextChanged(object sender, EventArgs e)
        {
            setTextToForm2(textBox1.Text);
        }

        private void Button1_Click(object sender, EventArgs e)
        {
            form2.Visible = !form2.Visible;
        }
    }
}

Form2.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        public void SetTextFromForm1(string str)
        {
            label1.Text = str;
        }
    }
}