Multiheckbox列表框的可用工具 [英] Available tool for Multicheckbox listbox

问题描述

您好

是否有工具可以选择（选中）列表框中的多个项目，并选择"全部选择"选项。

Is there a tool for selecting (checking) multiple items in a listbox with a "Select all" option.

推荐答案

简单的解决方案是使用如下代码的按钮。

The simple solution would be to have a button with code like below.

for (int i = 0; i < checkedListBox1.Items.Count; i++)
{
    checkedListBox1.SetItemChecked(i, true);
}

以下选择全部切换。它可以改进我做得相当快。

The following does a select all toggle. It can be improved on I did rather fast.

using System;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public class CheckedListBoxSelectAll :CheckedListBox
    {
        public CheckedListBoxSelectAll()
        {
            Items.Add("Select All");
            ItemCheck += CheckedListBoxSelectAll_ItemCheck;
        }
        private void CheckedListBoxSelectAll_ItemCheck(object sender, ItemCheckEventArgs e)
        {
            if (e.Index == 0)
            {
                ItemCheck -= CheckedListBoxSelectAll_ItemCheck;
                var state = Convert.ToBoolean(e.NewValue);

                for (var i = 1; i < Items.Count; i++)
                {
                    SetItemChecked(i, state);
                }
                ItemCheck += CheckedListBoxSelectAll_ItemCheck;
            }
        }
        /// <summary>
        /// We should override Items.Clear
        /// </summary>
        public void Clear()
        {
            Items.Clear();
            Items.Add("Select All");
        }

    }
}

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