[C#]簡單自繪帶圖片的 ComboBox

先看看效果：

先構造一個子項的類：

[csharp] 
using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Drawing;// 
 
namespace ComboBox_Draw 
{ 
    //自定義組合框項 
    class MyItem 
    { 
        //項文本內容 
        private String Text; 
        
        //項圖片 
        public Image Img; 
 
        //構造函數 
        public MyItem(String text, Image img) 
        { 
            Text = text; 
            Img = img; 
        } 
 
        //重寫ToString函數，返回項文本 
        public override string ToString() 
        { 
            return Text; 
        }  www.2cto.com
    } 
} 
 

然後看重寫DrawItem事件：

[csharp] 
private void ComboBox1_DrawItem(object sender, DrawItemEventArgs e) 
        { 
            //鼠標選中在這個項上 
            if ((e.State & DrawItemState.Selected) != 0) 
            { 
                //漸變畫刷 
                LinearGradientBrush brush = new LinearGradientBrush(e.Bounds, Color.FromArgb(255, 251, 237), 
                                                 Color.FromArgb(255, 236, 181), LinearGradientMode.Vertical); 
                //填充區域 
                Rectangle borderRect = new Rectangle(3, e.Bounds.Y, e.Bounds.Width - 5, e.Bounds.Height - 2); 
 
                e.Graphics.FillRectangle(brush, borderRect); 
 
                //畫邊框 
                Pen pen = new Pen(Color.FromArgb(229, 195, 101)); 
                e.Graphics.DrawRectangle(pen, borderRect); 
            } 
            else 
            { 
                SolidBrush brush = new SolidBrush(Color.FromArgb(255, 255, 255)); 
                e.Graphics.FillRectangle(brush, e.Bounds); 
            } 
 
            //獲得項圖片,繪制圖片 
            MyItem item = (MyItem)comboBox1.Items[e.Index]; 
            Image img = item.Img; 
            
            //圖片繪制的區域 
            Rectangle imgRect = new Rectangle(6, e.Bounds.Y + 3, 45,45); 
            e.Graphics.DrawImage(img, imgRect); 
             
            //文本內容顯示區域 
            Rectangle textRect = 
                    new Rectangle(imgRect.Right + 2, imgRect.Y, e.Bounds.Width - imgRect.Width, e.Bounds.Height - 2); 
             
            //獲得項文本內容,繪制文本 
            String itemText = comboBox1.Items[e.Index].ToString(); 
 
            //文本格式垂直居中 
            StringFormat strFormat = new StringFormat(); 
            strFormat.LineAlignment = StringAlignment.Center; 
            e.Graphics.DrawString(itemText, new Font("微軟雅黑", 12), Brushes.Black, textRect, strFormat); 
        } 
 

最後是窗體Load事件：最後是窗體Load事件：

[csharp] 
private void Form1_Load(object sender, EventArgs e) 
{ 
    //添加項 
    comboBox1.Items.Add(new MyItem("000000", Image.FromFile(Application.StartupPath + "\\0.gif"))); 
    comboBox1.Items.Add(new MyItem("111111", Image.FromFile(Application.StartupPath + "\\1.gif"))); 
    comboBox1.Items.Add(new MyItem("222222", Image.FromFile(Application.StartupPath + "\\2.gif"))); 
    comboBox1.Items.Add(new MyItem("333333", Image.FromFile(Application.StartupPath + "\\3.gif"))); 
 
    //默認選中項索引 
    comboBox1.SelectedIndex = 0; 
 
    //自繪組合框需要設置的一些屬性 
    comboBox1.DrawMode = DrawMode.OwnerDrawFixed; 
    comboBox1.DropDownStyle = ComboBoxStyle.DropDownList; 
    comboBox1.ItemHeight = 50; 
    comboBox1.Width = 200; 
 
    //添加DrawItem事件處理函數 
    comboBox1.DrawItem += ComboBox1_DrawItem; 
 
} 
作者：isaced