how to show all checked items in a same CheckedListBox ?

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I have one CheckedListBox(CheckedListBox1) and one CheckBox(CheckBox1).

I want to show all the checked items in a same CheckedListBox1,
suppose when checkBox1 is checked then show which items were checked in CheckedListBox1, and if checkbox is unchecked then show all items(which checked before and rest of all).

Example of what i want to do :

CheckedListBox1 List Items are :
"A" unchecked
"B" Checked
"C" Checked
"D" Unchecked

if Checkbox is checked then shows only checked items from CheckedListbox1 to CheckedListbox1.
Here the items are :
"B" and "C"

if checkbox is unchecked then shows all items which were in CheckdeListBox1.
Here the items are :
"A" unchecked
"B" Checked
"C" Checked
"D" Unchecked

I saw it in VB6 Add component dialog Box, where all the component was in one checkedlistbox, and there was a checkbox(which text is "Selected Items only").if we checked that checkbox then it will shows only checked items in checkedlistbox.

How to do this??

thanks in Advanced!!!

Regards :
Jayanta.

Posted 10-Feb-14 2:23am

JayantaChatterjee

Updated 10-Feb-14 3:19am

v3

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2 solutions

Solution 1

try this

C#

private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {

            bool flag = (sender as CheckBox).Checked;
            for (int i = 0; i < checkedListBox1.Items.Count; i++)
                checkedListBox1.SetItemChecked(i, flag);

        }

Posted 10-Feb-14 2:34am

Karthik_Mahalingam

Comments

BillWoodruff 10-Feb-14 8:39am

+5 Lean, clean, and mean.

Karthik_Mahalingam 10-Feb-14 8:40am

Thanks Bill:)

JayantaChatterjee 10-Feb-14 8:43am

Sir, Sorry for My English language..

I want to show only checked Items from checkedListBox, means when checkBox is checked then show which items were checked in CheckedListBox, and if checkbox is unchecked then show all items(which checked before and rest of all)...

Karthik_Mahalingam 10-Feb-14 8:44am

show in what ?
label , textbox ??

JayantaChatterjee 10-Feb-14 8:45am

show in same CheckedListBox1.

Karthik_Mahalingam 10-Feb-14 8:54am

bool flag = (sender as CheckBox).Checked;
if (flag)
{
// change the datasoruce of the checkbox list to show only the checked(true) items
// and check all in it.
}
else
{
// change the datasoruce of the checkbox list to show only the unchecked (false)items
// and uncheck all in it.
}

Siva Hyderabad 10-Feb-14 8:54am

+5

Karthik_Mahalingam 10-Feb-14 8:56am

Thanks Siva

JayantaChatterjee 10-Feb-14 9:12am

Sir,
i want to do:- I have two controls one is CheckedListBox1 and another is CheckBox1.

CheckedListBox1 List Items are :
"A" unchecked
"B" Checked
"C" Checked
"D" Unchecked

if Checkbox is checked then shows only checked items from CheckedListbox1 to CheckedListbox1 . Here the items are :
"B" and "C"
if checkbox is unchecked then shows all items which were in CheckdeListBox1. Here the items are :
"A" unchecked
"B" Checked
"C" Checked
"D" Unchecked

I saw it in VB6 Add component dialog Box, where all the component are in one checkedlistbox, and there was a checkbox(which text is "Selected Items only").if we checked that checkbox then it will shows only checked items in checkedlistbox.

Karthik_Mahalingam 10-Feb-14 9:27am

try this

bool flag = (sender as CheckBox).Checked;
if (flag)
{
// change the datasoruce of the checkbox list to show only the checked(true) items
// and check all in it.
}
else
{
// change the datasoruce of the checkbox list to show only the unchecked (false)items
// and uncheck all in it.
}

or post your code..
i wil try to trace your problem..
i am going out now.will be back after sometime only..

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Vedat Ozan Oner · Accepted Answer · 2014-02-10T03:32:00

here what you want:

// file: MyCheckListBox 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Test_Checklist
{
    public class MyCheckListBox : System.Windows.Forms.CheckedListBox
    {
        List<object> all = new List<object>();
        List<int> chks = new List<int>();
        bool showChecked = false;

        public MyCheckListBox()
            : base()
        {
            this.ItemCheck += MyCheckListBox_ItemCheck;
        }

        void MyCheckListBox_ItemCheck(object sender, System.Windows.Forms.ItemCheckEventArgs e)
        {
            if (!this.showChecked)
                return;

            var o = this.Items[e.Index];
            int oi = all.IndexOf(o);
            if (e.NewValue == System.Windows.Forms.CheckState.Checked)
                chks.Add(oi);
            else
                chks.Remove(oi);

        }

        public void ShowOnlyChecked(bool val)
        {
            this.showChecked = val;

            if (val)
            {
                all.AddRange(this.Items.Cast<object>());
                chks.AddRange(this.CheckedIndices.Cast<int>());

                for (int i = 0; i < all.Count; i++)
                    if (!chks.Contains(i))
                        this.Items.Remove(all[i]);
            }
            else
            {
                this.Items.Clear();
                this.Items.AddRange(this.all.ToArray());
                this.chks.ForEach(i1 => this.SetItemChecked(i1, true));

                all.Clear();
                chks.Clear();
            }
        }


    }
}

and an example form:

C#

// file: 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 Test_Checklist
{
    public partial class Form1 : Form
    {
        MyCheckListBox lb = new MyCheckListBox();

        public Form1()
        {
            InitializeComponent();

            this.SuspendLayout();
            this.Controls.Add(lb);
            this.lb.Items.AddRange(new string[] { "item1", "item2", "item3" });
            this.lb.Left = this.checkBox1.Left;
            this.lb.Top = this.checkBox1.Top + 20;

            this.ResumeLayout(false);


            this.checkBox1.CheckState = CheckState.Unchecked;
            this.checkBox1.CheckedChanged += checkBox1_CheckedChanged;
        }

        void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            switch (this.checkBox1.CheckState)
            {
                case CheckState.Checked:
                    this.lb.ShowOnlyChecked(true);
                    break;
                case CheckState.Indeterminate:
                case CheckState.Unchecked:
                    this.lb.ShowOnlyChecked(false);
                    break;
                default:
                    break;
            }
        }
    }


}

It doesn't have designer support, but you can convert it into custom control.