如何在同一个CheckedListBox中显示所有选中的项目？

问题描述

我有一个CheckedListBox（ CheckedListBox1 ）和一个CheckBox（ CheckBox1 ）。



我想在同一个 CheckedListBox1 中显示所有已检查的项目，

假设<$检查c $ c> checkBox1 然后显示在 CheckedListBox1 中检查了哪些项目，如果未选中复选框，则显示所有项目（之前检查过的项目和剩下的了。





我想做的例子：



CheckedListBox1列表项目是：

A未选中

B已检查

C已检查

D未选中



如果选中复选框，则仅显示从CheckedListbox1到CheckedListbox1的已检查项目。

这里的项目是：

B和C



如果未选中复选框，则显示所有项目在CheckdeListBox1中。

这里的项目是：

A未选中

B已检查

C已检查

D未选中



我在VB6中看到它添加组件对话框，其中所有组件都在一个checkedlistbox，并且有一个复选框（文本是仅限所选项目）。如果我们选中该复选框，那么它将仅显示checkedlistbox中的已检查项目。





如何做到这一点??





感谢高级!!!



问候：

Jayanta。

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.

推荐答案

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);

        }

// 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();
            }
        }


    }
}

和示例表格：

and an example form:

// 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;
            }
        }
    }


}

它没有设计师支持，但您可以将其转换为自定义控件。

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

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