C (thirty) C combobox listview TreeView

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comboBox Drop down list box properties

Items： Drop down list box options

DropDownStyle： Control the appearance and function of the combo box

Simple： Single style

DropDown： Default style （ You can enter ）

DropDownList： It looks the same as the default style , But it is not allowed to enter .

ListView List view properties

Activeation：

Standard： Standard events that occur when icons are double clicked consecutively

Oneclick： Events that occur on a single machine

Twoclick： There is no need to double-click continuously , Two single machines

Largeimagelist： Store large icon collections

Smallimagelist： Store a collection of small icons

View： Display style

Tile： tile

List： list

LargeIcon： Large icon

SmallIcon： Small icons

Details： detailed

Columns： Columns displayed in the details view

ListView List view events

ItemActive： Occurs when an item is activated .

columnClick： Occurs when a column header is clicked .

treeView Tree view properties ：

nodes： Control

imageindex： Selected image

selectimageindex： The selected picture

SelectNode： Selected node

As shown in the figure below ：

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-nORX28aQ-1656122785106)(https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/dadc087da6d34099ad4c4bc62d92406e~tplv-k3u1fbpfcp-zoom-1.image “1555492312851584.png”)]

The test uses all the code

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 _0416Day
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            int num = comboBox1.SelectedIndex;
            if( num == 0)
            {
                label1.ForeColor = Color.LightPink;
            }
            else if(num == 1)
            {
                label1.ForeColor = Color.BlueViolet;
            }
            else if(num == 2)
            {
                label1.ForeColor = Color.Blue;
            }
            else if (num == 3)
            {
                label1.ForeColor = Color.Coral;
            }
 
        }
 
        /**
         *  Tile button 
         */
        private void button1_Click(object sender, EventArgs e)
        {
            listView.View = View.Tile;
        }
 
        /**
         *  List button 
         */
        private void button2_Click(object sender, EventArgs e)
        {
            listView.View = View.List;
        }
 
        /**
         *  Large icon button 
         */
        private void button3_Click(object sender, EventArgs e)
        {
            listView.View = View.LargeIcon;
        }
 
        /**
         *  Small icon button 
         */
        private void button4_Click(object sender, EventArgs e)
        {
            listView.View = View.SmallIcon;
        }
 
        /**
         *  Detailed button 
         */
        private void button5_Click(object sender, EventArgs e)
        {
            listView.View = View.Details;
        }
 
        private void listView_ItemActivate(object sender, EventArgs e)
        {
            //  Get the corresponding document path 
            string mydoc = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
            string mymusic = Environment.GetFolderPath(Environment.SpecialFolder.MyMusic);
            switch(listView.SelectedIndices[0])
            {
                case 0:System.Diagnostics.Process.Start("calc");break;
                case 1: System.Diagnostics.Process.Start(mydoc); break;
                case 2: System.Diagnostics.Process.Start("IExplore"); break;
                case 3: System.Diagnostics.Process.Start(mymusic); break;
                case 4: System.Diagnostics.Process.Start("notepad"); break;
            }
        }
 
        private void listView_ColumnClick(object sender, ColumnClickEventArgs e)
        {
            if (listView.Sorting == SortOrder.None)
            {
                listView.Sorting = SortOrder.Ascending;
            }
            else if (listView.Sorting == SortOrder.Ascending)
            {
                listView.Sorting = SortOrder.Descending;
            }
            else
            {
                listView.Sorting = SortOrder.Ascending;
            }
        }
 
        private void treeView_AfterSelect(object sender, TreeViewEventArgs e)
        {
            //  Get the corresponding document path 
            string mydoc = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
            string mymusic = Environment.GetFolderPath(Environment.SpecialFolder.MyMusic);
            switch (e.Node.Text)
            {
                case " Calculator ": System.Diagnostics.Process.Start("calc"); break;
                case " My computer ": System.Diagnostics.Process.Start(mydoc); break;
                case " my IE": System.Diagnostics.Process.Start("IExplore"); break;
                case " My music ": System.Diagnostics.Process.Start(mymusic); break;
                case " My notebook ": System.Diagnostics.Process.Start("notepad"); break;
            }
        }
 
        /**
         *  Select Add node in the project 
         */
        private void button7_Click(object sender, EventArgs e)
        {
            TreeNode cyaa = new TreeNode("cyaa");
            cyaa.ImageIndex = 0;
            cyaa.SelectedImageIndex = 0;
            treeView.SelectedNode.Nodes.Add(cyaa);
        }
 
        /**
         *  Add root and child nodes 
         */
        private void button6_Click(object sender, EventArgs e)
        {
            TreeNode cy1 = new TreeNode("cy1");
            cy1.ImageIndex = 0;
            cy1.SelectedImageIndex = 0;
            treeView.Nodes.Add(cy1);
 
            TreeNode cy1a = new TreeNode("cy1a");
            cy1a.ImageIndex = 1;
            cy1a.SelectedImageIndex = 1;
            cy1.Nodes.Add(cy1a);
 
        }
    }
}

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