C#自定义控件下拉菜单

新手，还在学校奋斗中，头一回分享代码， 在网上看到一些例子有了灵感，用按钮加ListBox的OwnerDrawFixed绘制做了一个可以实现收缩的菜单控件，不足之处望大佬们指点

  1 using System;
  2 using System.Collections.Generic;
  3 using System.ComponentModel;
  4 using System.Data;
  5 using System.Drawing;
  6 using System.Linq;
  7 using System.Text;
  8 using System.Threading.Tasks;
  9 using System.Windows.Forms;
 10 
 11 namespace WindowsFormsApplication1
 12 {
 13     public partial class Form1 : Form
 14     {
 15         private Color SetColor = Color.AliceBlue;
 16 
 17         int a, b, c = 0;
 18         public Form1()
 19         {
 20             InitializeComponent();
 21         }
 22 
 23         private void Form1_Load(object sender, EventArgs e)
 24         {
 25             LoadList();
 26         }   
 27 
 28         private void LoadList()
 29         {
 30             button1.BringToFront();
 31             button1.Dock = DockStyle.Top;
 32             listBox1.BringToFront();
 33             listBox1.Dock = DockStyle.Top;
 34             button2.BringToFront();
 35             button2.Dock = DockStyle.Top;
 36             listBox2.BringToFront();
 37             listBox2.Dock = DockStyle.Top;
 38             button3.BringToFront();
 39             button3.Dock = DockStyle.Top;
 40             listBox3.BringToFront();
 41             listBox3.Dock = DockStyle.Top;
 42             listBox1.Visible = false;
 43             listBox2.Visible = false;
 44             listBox3.Visible = false;
 45         }
 46 
 47 
 48         private void button1_Click(object sender, EventArgs e)
 49         {
 50             if (a == 0)
 51             {
 52                 listBox1.Visible = true;
 53                 a = 1;
 54             }
 55             else
 56             {
 57                 a = 0;
 58                 listBox1.Visible = false;
 59             }
 60         }
 61 
 62 
 63         
 64         private void button2_Click(object sender, EventArgs e)
 65         {
 66             if (b == 0)
 67             {
 68                 listBox2.Visible = true;
 69                 b = 1;
 70             }
 71             else
 72             {
 73                 listBox2.Visible = false;
 74                 b = 0;
 75             }
 76         }
 77 
 78         private void button3_Click(object sender, EventArgs e)
 79         {
 80             if (c == 0)
 81             {
 82                 listBox3.Visible = true;
 83                 c = 1;
 84             }
 85             else
 86             {
 87                 listBox3.Visible = false;
 88                 c = 0;
 89             }
 90         }
 91 
 92         private void listBox1_DrawItem(object sender, DrawItemEventArgs e)
 93         {
 94             ListBox lb = sender as ListBox;
 95             e.DrawBackground();
 96             Brush myBrush = Brushes.Black;
 97             if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
 98             {
 99                 myBrush = new SolidBrush(SetColor);
100                 e.Graphics.FillRectangle(myBrush, e.Bounds);
101             }
　　　　　　　　　 //可针对每一列数据更改背景色
102             switch (e.Index)
103             {
104                 case 0:
105                     myBrush = Brushes.Red;
106                     break;
107                 case 1:
108                     myBrush = Brushes.Orange;
109                     break;
110                 case 2:
111                     myBrush = Brushes.Purple;
112                     break;
113                 case 3:
114                     myBrush = Brushes.Aquamarine;
115                     break;
116                 case 4:
117                     myBrush = Brushes.BlueViolet;
118                     break;
119             }
120             StringFormat strFormat = new StringFormat();
121             strFormat.Alignment = StringAlignment.Center;
122             strFormat.LineAlignment = StringAlignment.Center;
123             e.DrawFocusRectangle();
124             e.Graphics.DrawString(lb.Items[e.Index].ToString(), e.Font, myBrush, e.Bounds, strFormat);
125         }
126 
127         
128     }
129 }
130  效果图

类似效果用ListView做更简单，但我个人感觉ListBox效果更好。
欢迎各位大佬指点交流。。。       

 

 

转载于:https://www.cnblogs.com/nsjh/p/7147389.html