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curlygoat

I have a ComBox control on the main form. I use the showDialog method to show a custom dialog box on the main form. There is a textBox control on it. I add data and activate a click event by clicking the "Finish" button. At the same time, a public method on the main form is called. This method mainly calls ComBox.Items.Add ("string").
But this did not achieve the effect I expected.

Excuse me, how can the data on the dialog box be transferred to the main form and added to the Items of comBox?

curlygoat

Still didn't make it clear, that ComBox.Items.Add ("string"). It's ComBox.Items.Add (textBox.Text.ToString ()). The dialog's textBox

冷雨雪

Please refer to
Easily master data interaction between Windows forms in .net
http://blog.csdn.net/Leng Yuxue / archive / 2004/04/05 / 22027.aspx
Form parameter passing
http://blog.csdn.net/Leng Yuxue / archive / 2006/05/05 / 708941.aspx # sec5

kalian2000

With delegation ...

See also:
http://community.csdn.net/Expert/topic/5189/5189957.xml?temp=.6943018

The post I asked before asked "How to pass the values ​​in the subform to the ListView of the main form", the same reason ...

kalian2000

Main form Form1:

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

namespace ComboboxTest
{
    // define a delegate
    public delegate void MyInvoke (string txt);
    public partial class Form1: Form
    {
        public Form1 ()
        {
            InitializeComponent ();
        }

        private void button1_Click (object sender, EventArgs e)
        {
            Form2 frm = new Form2 (new MyInvoke (UpdateCombobox));
            frm.ShowDialog (this);
        }
        private void UpdateCombobox (string txt)
        {
            //Add to
            this.comboBox1.Items.Add (txt);
            // Select the newly added item
            this.comboBox1.SelectedIndex = this.comboBox1.Items.Count-1;
        }
    }
}


Subform Form2:

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

namespace ComboboxTest
{
    public partial class Form2: Form
    {
        private MyInvoke mi = null;
        public Form2 (MyInvoke myInvoke)
        {
            InitializeComponent ();
            mi = myInvoke;
        }

        private void button1_Click (object sender, EventArgs e)
        {
            this.mi (this.textBox1.Text.Trim ());
            this.Close ();
        }
    }
}

For a detailed explanation, please see the original post ..

curlygoat

Thank you very much for the answers, but what is the reason why my method is not successful?

kalian2000

How about you call that method on the main form?

nishizhu

A value on the subform (dialog) should be passed back to the caller as public