鼠标滚轮事件（C＃）
我无法在主窗体中获取鼠标滚轮事件。
作为演示，我想出了一个简单的例子：
public partial class Form1 : Form { public Form1() { InitializeComponent(); this.panel1.MouseWheel += new MouseEventHandler(panel1_MouseWheel); this.panel1.MouseMove += new MouseEventHandler(panel1_MouseWheel); Form2 f2 = new Form2(); f2.Show(this); } private void panel1_MouseWheel(object sender, MouseEventArgs e) { if(e.Delta != 0) Console.Out.WriteLine(e.Delta); } } public partial class Form2 : Form { public Form2() { InitializeComponent(); this.MouseMove += new MouseEventHandler(Form2_MouseMove); this.MouseWheel += new MouseEventHandler(Form2_MouseMove); } private void Form2_MouseMove(object sender, MouseEventArgs e) { if(e.Delta != 0) Console.Out.WriteLine(e.Delta); } } 我在Form2中得到了鼠标滚轮事件，但没有Form1任何想法？
干杯，
詹姆士
我怀疑只要鼠标hover在面板上，即使面板没有焦点，OP也希望获得滚动事件。
这里解释了实现此行为的方法：
http://social.msdn.microsoft.com/forums/en-US/winforms/thread/eb922ed2-1036-41ca-bd15-49daed7b637c/
和这里：
http://social.msdn.microsoft.com/forums/en-US/winforms/thread/6bfb9287-986d-4c60-bbcc-23486e239384/
从链接论坛获取的代码片段之一：
using System; using System.ComponentModel; using System.Drawing; using System.Windows.Forms; using System.Runtime.InteropServices; namespace WindowsApplication1 { public partial class Form1 : Form, IMessageFilter { public Form1() { InitializeComponent(); Application.AddMessageFilter(this); } public bool PreFilterMessage(ref Message m) { if (m.Msg == 0x20a) { // WM_MOUSEWHEEL, find the control at screen position m.LParam Point pos = new Point(m.LParam.ToInt32() & 0xffff, m.LParam.ToInt32() >> 16); IntPtr hWnd = WindowFromPoint(pos); if (hWnd != IntPtr.Zero && hWnd != m.HWnd && Control.FromHandle(hWnd) != null) { SendMessage(hWnd, m.Msg, m.WParam, m.LParam); return true; } } return false; } // P/Invoke declarations [DllImport("user32.dll")] private static extern IntPtr WindowFromPoint(Point pt); [DllImport("user32.dll")] private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp); } }
此代码将基本拦截所有wm_mousewheel事件，并将它们重定向到鼠标当前hover的控件。 面板不再需要具有焦点来接收车轮事件。
你的问题来自于form1具有焦点，而不是panel1。 …哪个方面意味着将触发form1的事件，而不是panel1的事件。
我重新创建了你的场景，对Form1中的构造函数进行了以下更改，并validation它是否触发滚轮事件。
public Form1() { InitializeComponent(); /* --- Old code that don't work --- this.panel1.MouseWheel += new MouseEventHandler(panel1_MouseWheel); this.panel1.MouseMove += new MouseEventHandler(panel1_MouseWheel); */ this.MouseWheel += new MouseEventHandler(panel1_MouseWheel); this.MouseMove += new MouseEventHandler(panel1_MouseWheel); Form2 f2 = new Form2(); f2.Show(this); } }
添加面板MouseEnter另一个事件，并在其回调函数中获取输入焦点：
void MouseEnterEvent() { this.Panel.Focus(); }
感谢@nitrogenycs的回答，我写了一个简单的generics类来轻松解决这个问题：
using System; using System.Windows.Forms; using System.Runtime.InteropServices; using System.Drawing; namespace MyNamespace { public class MouseWheelManagedForm : Form, IMessageFilter { private bool managed; public MouseWheelManagedForm () : this (true) { } public MouseWheelManagedForm (bool start) { managed = false; if (start) ManagedMouseWheelStart(); } protected override void Dispose (bool disposing) { if (disposing) ManagedMouseWheelStop(); base.Dispose(disposing); } /************************************ * IMessageFilter implementation * *********************************/ private const int WM_MOUSEWHEEL = 0x20a; // P/Invoke declarations [DllImport("user32.dll")] private static extern IntPtr WindowFromPoint (Point pt); [DllImport("user32.dll")] private static extern IntPtr SendMessage (IntPtr hWnd, int msg, IntPtr wp, IntPtr lp); private bool IsChild (Control ctrl) { Control loopCtrl = ctrl; while (loopCtrl != null && loopCtrl != this) loopCtrl = loopCtrl.Parent; return (loopCtrl == this); } public bool PreFilterMessage (ref Message m) { if (m.Msg == WM_MOUSEWHEEL) { //Ensure the message was sent to a child of the current form if (IsChild(Control.FromHandle(m.HWnd))) { // Find the control at screen position m.LParam Point pos = new Point(m.LParam.ToInt32() & 0xffff, m.LParam.ToInt32() >> 16); //Ensure control under the mouse is valid and is not the target control //otherwise we'd be trap in a loop. IntPtr hWnd = WindowFromPoint(pos); if (hWnd != IntPtr.Zero && hWnd != m.HWnd && Control.FromHandle(hWnd) != null) { SendMessage(hWnd, m.Msg, m.WParam, m.LParam); return true; } } } return false; } /**************************************** * MouseWheelManagedForm specific methods * **************************************/ public void ManagedMouseWheelStart () { if (!managed) { managed = true; Application.AddMessageFilter(this); } } public void ManagedMouseWheelStop () { if (managed) { managed = false; Application.RemoveMessageFilter(this); } } } }
从那里，您只需要从此类inheritance您的Form而不是Form，因为您需要“管理”MouseWheel的每个表单：
using System; using System.Collections.Generic; using System.Data; using System.Linq; using System.Windows.Forms; namespace MyApp { public partial class MyForm : MyNamespace.MouseWheelManagedForm { public MyForm () { InitializeComponent(); } } }
希望这会帮助别人（比我）。
也许这对你有用吗？
public partial class Form1 : Form { public Form1() { InitializeComponent(); Form2 f2 = new Form2(); f2.MouseWheel += new MouseEventHandler(panel1_MouseWheel); f2.MouseMove += new MouseEventHandler(panel1_MouseWheel); f2.Show(this); } private void panel1_MouseWheel(object sender, MouseEventArgs e) { if(e.Delta != 0) Console.Out.WriteLine(e.Delta); } }
面板本身不具有焦点，只有放置在面板内的项目才能具有焦点。 一旦放入其中的某些东西并且该东西具有焦点，该面板将仅接收MouseWheel事件。 只需在面板上方移动并移动鼠标滚轮，即可将事件发送到表单，而不是面板。
这是两个例子之间的区别。
我认为你有点误解了我的问题。 在我的主窗体上使用下面的代码我不会得到MouseWheel事件：
public Form1() { InitializeComponent(); this.panel1.MouseWheel += new MouseEventHandler(panel1_MouseWheel); this.panel1.MouseMove += new MouseEventHandler(panel1_MouseWheel); }
但我确实得到了以下事件：
public Form1() { InitializeComponent(); this.MouseWheel += new MouseEventHandler(panel1_MouseWheel); }
如果没有Form2的混淆，我希望更清楚。 我只是试图在我的主窗体中的Panel上获取MouseWheel事件。
干杯，
詹姆士
this.MouseWheel += pictureBox1_MouseWheel; //tanımlama void pictureBox1_MouseWheel(object sender, MouseEventArgs e) { if (Convert.ToString(e.Delta) == "120") { //yukarı } else if (Convert.ToString(e.Delta) == "-120") { //aşağı } }