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 WinformAllControls
{
    public partial class CheckBox : Form
    {
        public CheckBox()
        {
            InitializeComponent();
        }

        private void CheckBox_Load(object sender, EventArgs e)
        {
            List<string> coures = new List<string>();
            coures.Add("語文");
            coures.Add("數學");
            coures.Add("英語");
            coures.Add("物理");
            //為checklistbox賦值
            foreach (string item in coures)
            {
                checklb.Items.Add(item);
            }
          
        }


        private void btn_getListItmes_Click(object sender, EventArgs e)
        {   //獲取所有選中狀態的值
            string str="";
            for (int i =0; i < checklb.Items.Count; i++) {
                if (checklb.GetItemChecked(i)) {
                    str +=checklb.GetItemText(checklb.Items[i]);
                }
            }
            MessageBox.Show(str);
        }

        private void checklb_ItemCheck(object sender, ItemCheckEventArgs e)
        {      //實現checklistbox單選
            //if (checklb.SelectedItems.Count > 0)
            //{
            //    //理論：除了指定的item項，其他項均設定為未選中，強調一點只能改變一個屬性值，切記不能迴圈觸發事件
            //    for (int i = 0; i < checklb.Items.Count; i++)
            //    {
            //        int index1 = e.Index;
            //        if (i!= index1)
            //        {  
            //            this.checklb.SetItemCheckState(i, CheckState.Unchecked);
            //        }
                    
            //    }
            //}
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox1.Checked)
            {
                for (int i = 0; i < checklb.Items.Count; i++)
                {
                    if (checklb.GetItemChecked(i))
                    {
                        checklb.SetItemChecked(i, false);
                    }
                    else
                    {
                        checklb.SetItemChecked(i, true);
                    }
                }
            }

        }
    }
}