太怪了，我只是新建了一个禁用滚轮的Combobox控件，为何窗体中所有控件的滚轮操作都失效了
是否还少了一个什么判断：
这是从网上找来的代码：
namespace DataTools
{
public class comboNoWheel: System.Windows.Forms.ComboBox,IMessageFilter
{
public comboNoWheel()
{
Application.AddMessageFilter(this);
}

public bool PreFilterMessage(ref Message m)
{
if(m.Msg == 0x020A)namespace DataTools
{
public class comboNoWheel: System.Windows.Forms.ComboBox,IMessageFilter
{
public comboNoWheel()
{
Application.AddMessageFilter(this);
}

public bool PreFilterMessage(ref Message m)
{
if(m.Msg == 0x020A) //感觉 是这里少了个判断不知道加什么
return true;
return false;
}
}
}

return true;
return false;
}
}
}

[解决办法]
Application.AddMessageFilter(this);

这一行会往全局的消息泵中添加过滤器，自然对整个窗体都管用。
[解决办法]
一个重写事件的方法

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public bool isWheel = false;
        public string strComB = null; 
 
 
        public Form1()
        {
            InitializeComponent();
 
            this.comboBox1.MouseWheel += new MouseEventHandler(comboBox1_MouseWheel);
            this.comboBox1.TextChanged += new EventHandler(comboBox1_TextChanged);
            this.comboBox1.MouseDown += new MouseEventHandler(comboBox1_MouseDown);
        }
 
        void comboBox1_MouseDown(object sender, MouseEventArgs e)
        {
            // throw new NotImplementedException();
            isWheel = false;
        }
 
        void comboBox1_TextChanged(object sender, EventArgs e)
        {
            // throw new NotImplementedException();
            if (isWheel)
            {
                comboBox1.Text = strComB;
            }
        }
 
 
        void comboBox1_MouseWheel(object sender, MouseEventArgs e)
        {
            // throw new NotImplementedException();
            strComB = comboBox1.Text;
            isWheel = true;
        }
    }
}