checkedListBox 的用发

Posted 2020-10-09 Jerron Lu

一般认为：foreach (object obj in checkedListBox1.SelectedItems)即可遍历选中的值。

其实这里遍历的只是高亮的值并不是打勾的值。遍历打勾的值要用下面的代码：

 

for (int i = 0; i < checkedListBox1.Items.Count; i++)
{
    if (checkedListBox1.GetItemChecked(i))
    {
        MessageBox.Show(checkedListBox1.GetItemText(checkedListBox1.Items[i]));
    }
}

 

 

 

最近用到checklistbox控件，在使用其过程中，花了较多的时间，这里我收集了其相关的代码段，希望对大家有所帮助。
1.
添加项
checkedListBox1.Items.Add(“蓝色“); 
checkedListBox1.Items.Add(“红色“); 
checkedListBox1.Items.Add(“黄色“);
 
2. 
判断第i项是否选中,选中为true,否则为false
if（checkedListBox1.GetItemChecked(i)）
{
     return true;
} 
else
{
     return false; 
}
 
3. 
设置第i项是否选中
checkedListBox1.SetItemChecked(i, true);  //true改为false为没有选中。
 
4. 
设置全选 
添加一个名为select_all的checkbox控件，由其控制checkedListBox是全选还是全不选。
private void select_all_CheckedChanged(object sender, EventArgs e) 
{ 
     if(select_all.Checked) 
{
          for (int j = 0; j < checkedListBox1.Items.Count; j++) 
               checkedListBox1.SetItemChecked(j, true); 
}
else 
{
for (int j =0; j < checkedListBox1.Items.Count; j++) 
      checkedListBox1.SetItemChecked(j, false);
}
}
 
5.
得到全部选中的值 ，并将选中的项的文本组合成为一个字符串。
 string strCollected = string.Empty;
 for (int i = 0; i < checkedListBox1.Items.Count; i++)
 {
      if (checkedListBox1.GetItemChecked(i))
      {
          if (strCollected == string.Empty)
          {
               strCollected = checkedListBox1.GetItemText(
checkedListBox1.Items[i]);
          }
          else
          {
               strCollected = strCollected + “/“ + checkedListBox1.
GetItemText(checkedListBox1.Items[i]);
           }
       }
}
 
 
6. 
设置CheckedListBox中第i项的Checked状态
checkedListBox1.SetItemCheckState(i, CheckState.Checked);
 
 
7. 
private void checkBoxAll_CheckedChanged(object sender, EventArgs e) 
{ 
     if (checkBoxAll.Checked) 
     { 
         //被选择了则将CheckedListBox中的所有条目都变为Checked状态 
         for (int i = 0; i < checkedListBoxLayerControl.Items.Count;
                   i++) 
         {     
checkedListBoxLayerControl.SetItemCheckState(i, 
        CheckState.Checked); 
} 
}
else 
{ 
     //否则变成Unchecked状态 
    for (int i = 0;
 i < checkedListBoxLayerControl.Items.Count; i++) 
{
       checkedListBoxLayerControl.SetItemCheckState(i, CheckState.Unchecked); 
}              
}
}

8. 
checkedListBox 单选设置(代码实现)
private void chkl_ItemAuditing_ItemCheck(object sender,   
ItemCheckEventArgs e)
{ 
     if (chkl_ItemAuditing.CheckedItems.Count > 0) 
    { 
         for (int i = 0; i < chkl_ItemAuditing.Items.Count; i++) 
         {
         if (i != e.Index) 
         { 
             this.chkl_ItemAuditing.SetItemCheckState(i, 
             System.Windows.Forms.CheckState.Unchecked); 
         } 
    } 
} 
}

9. 
checkedListBox1显示一个数据库中关键字对应的所有记录
for (int i = 0; i < table.Rows.Count; i++) 
{ 
    string name = table.Rows["myname"].ToString(); 
    string paw = table.Rows["mypaw"].ToString(); 
    checkedListBox1.Items.Add(name + paw); 
}
 
10. 
for(i=0;i<CheckedListBox.Items.Count;i++)   
{   
   if(CheckedListBox.GetItemText(
CheckedListBox.Items)==“你得到的值“)   
{   
      CheckedListBox.SetItemChecked(i,true);   
}   
}
 
11. 
清除checkedListBox1中所有的选项
for (int i = 0; i < checkedListBox1.Items.Count; i++)
{
    checkedListBox1.Items.Clear();
}
 
12. 
//设置索引为index的项为选中状态
for (int i = 0; i < checkedListBox1.Items.Count; i++) 
{
    checkedListBox1.SetItemChecked(i, true);
} 
 
13.   
for (int i = 0; i < checkedListBox1.Items.Count; i++) 
{
          if (checkedListBox1.GetSelected(i)) 
          {
                    MessageBox.Show(checkedListBox1.CheckedItems.ToString());
          }
}
 
14.
//选中checkedListBox1所有的选项
 
for (int i = 0; i < checkedListBox1.Items.Count; i++)         
{
          checkedListBox1.SetItemCheckState(i, CheckState.Checked);
}
 
15.             
for (int i = 0; i < checkedListBox1.Items.Count; i++) 
{  
          //如果checkedListBox1的第i项被选中，
          //则显示checkedListBox1对应的值
          if (checkedListBox1.GetItemChecked(i)) 
          { 
               MessageBox.Show(checkedListBox1.Items.ToString(
)); 
          }
}
 
16. 
//反向选择checkedListBox1的选项
for (int i = 0; i < checkedListBox1.Items.Count; i++) 
{ 
    if (checkedListBox1.GetItemChecked(i)) 
   { 
       checkedListBox1.SetItemChecked(i, false); 
   } 
   else 
   { 
       checkedListBox1.SetItemChecked(i, true); 
   } 
}

17. 
//checkedListBox1中选定的项->checkedListBox2
for (int i = 0; i < checkedListBox1.CheckedItems.Count; i++) 
{ 
     checkedListBox2.Items.Add(this.checkedListBox1.CheckedItems);
 
//remove是除去一个具体的值，不是index，注意了
     this.checkedListBox1.Items.Remove(
         this.checkedListBox1.CheckedItems);

using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace CheckedlistBox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            //clst.SelectedIndexChanged += Clst_SelectedIndexChanged;
            //clst.ItemCheck += new ItemCheckEventHandler(Clst_ItemCheck);
            //clst.SetItemChecked(1, true);
            button1.Click += new EventHandler(Button1_Click);
        }

        //private void Clst_SelectedIndexChanged(object sender,EventArgs e)
        //{
        //    string s = "";
        //    for (int x = 0; x <= clst.CheckedItems.Count - 1; x++)
        //    {
        //        s = s + "Checked Item " + (x + 1).ToString() + " = " + clst.CheckedItems[x].ToString() + "\\n";
        //    }
        //    MessageBox.Show(s); 
        //}

 

        private void Clst_ItemCheck(object sender, EventArgs e)
        {
            for (int i = 0; i < clst.Items.Count; i++)
            {
                if (clst.GetSelected(i))
                    MessageBox.Show(clst.SelectedItem.ToString());
            }
            //MessageBox.Show(clst.SelectedItem.ToString());
            //for (int i = 0; i < clst.Items.Count; i++)
            //{
            //    if (clst.GetItemChecked(i))
            //        MessageBox.Show(clst.GetItemText(clst.Items[i]));

            //}
        }
        private void Button1_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < clst.Items.Count; i++)
            {
                if (clst.GetItemChecked(i))
                {
                    clst.SetItemChecked(i, false);
                }
                else
                    clst.SetItemChecked(i, true);
            }
        }
    }

   
}