我一直试图避免在stackoverflow上问一些看似琐碎的问题。上次我问问题时,得到了许多负面回应,所以我想试着自己解决这个问题。所以大约一个月后,通过阅读两本书和一些视频教程,我仍然很困惑。 :)
据我的调试器显示,MainWindow.xaml.cs类的第39行被调用,但第30或31行似乎没有触发UI上的任何内容,有一次它确实触发了,但同时也给了我一个运行时错误。数周的困惑之后,我有点休息了一下,转而去做其他事情,所以我不确定我做了什么来消除运行时错误。所以,现在我请求帮助:)
更新
MainWindow.xaml.cs第45行返回异常:
“object because a different thread owns it.”
我的MIDI类:
所以,答案似乎是改变:
感谢您的所有帮助!
据我的调试器显示,MainWindow.xaml.cs类的第39行被调用,但第30或31行似乎没有触发UI上的任何内容,有一次它确实触发了,但同时也给了我一个运行时错误。数周的困惑之后,我有点休息了一下,转而去做其他事情,所以我不确定我做了什么来消除运行时错误。所以,现在我请求帮助:)
更新
MainWindow.xaml.cs第45行返回异常:
“object because a different thread owns it.”
我的MIDI类:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NAudio.Midi;
namespace StaveHelper
{
public sealed class MIDIMain
{
private static MIDIMain midiMain = null;
public static int noteOnNumber;
public static int noteOffNumber;
public MidiIn midiIn;
public bool noteOn;
private bool monitoring;
private int midiInDevice;
private MIDIMain()
{
GetMIDIInDevices();
}
public static MIDIMain GetInstance()
{
if (null == midiMain)
{
midiMain = new MIDIMain();
}
return midiMain;
}
public string[] GetMIDIInDevices()
{
//Get a list of devices
string[] returnDevices = new string[MidiIn.NumberOfDevices];
//Get the product name for each device found
for (int device = 0; device < MidiIn.NumberOfDevices; device++)
{
returnDevices[device] = MidiIn.DeviceInfo(device).ProductName;
}
return returnDevices;
}
public void StartMonitoring(int MIDIInDevice)
{
if (midiIn == null)
{
midiIn = new MidiIn(MIDIInDevice);
}
midiIn.Start();
monitoring = true;
}
public void midiIn_MessageReceived(object sender, MidiInMessageEventArgs e)
{
//int noteNumber;
// Exit if the MidiEvent is null or is the AutoSensing command code
if (e.MidiEvent != null && e.MidiEvent.CommandCode == MidiCommandCode.AutoSensing)
{
return;
}
if (e.MidiEvent.CommandCode == MidiCommandCode.NoteOn)
{
// As the Command Code is a NoteOn then we need
// to cast the MidiEvent to the NoteOnEvent
NoteOnEvent ne;
ne = (NoteOnEvent)e.MidiEvent;
noteOnNumber = ne.NoteNumber;
}
if (e.MidiEvent.CommandCode == MidiCommandCode.NoteOff)
{
NoteEvent ne;
ne = (NoteEvent)e.MidiEvent;
noteOffNumber = ne.NoteNumber;
}
}
//// send the note value to the the MainWindow for display
//public int sendNoteNum(int noteNumber)
//{
// noteOnNumber = noteNumber;
// noteOn = true;
// return noteOnNumber;
//}
}
我的 MainWindow.xaml.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using NAudio.Midi;
using System.Threading;
using System.Windows.Threading;
namespace StaveHelper
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
Config config;
MIDIMain midiMain;
public delegate void mon(object sender, MidiInMessageEventArgs e);
public MainWindow()
{
this.InitializeComponent();
// Insert code required on object creation below this point.
midiMain = MIDIMain.GetInstance();
config = new Config();
config.load_MIDIIn_Devices();
//Thread t = new Thread(monitorNotes);
midiMain.midiIn.MessageReceived += new EventHandler<MidiInMessageEventArgs>(monitorNotes);
}
public void monitorNotes(object sender, MidiInMessageEventArgs e) //LINE 39: MONITOR NOTES
{
switch ( MIDIMain.noteOnNumber)
{
case 30:
C3.Opacity = 100; //LINE 45: "The calling thread cannot access this
C3Dot.Opacity = 100; //object because a different thread owns it."
break;
case 31:
D3Dot.Opacity = 100;
break;
}
}
~MainWindow()
{
}
private void btnConfig_Click(object sender, RoutedEventArgs e)
{
config.Show();
}
}
}
所以,答案似乎是改变:
switch ( MIDIMain.noteOnNumber)
{
case 30:
C3.Opacity = 100; //LINE 45: "The calling thread cannot access this
C3Dot.Opacity = 100; //object because a different thread owns it."
break;
case 31:
D3Dot.Opacity = 100;
break;
}
}
转换为
switch ( MIDIMain.noteOnNumber)
{
case 60:
C3.Dispatcher.BeginInvoke(
System.Windows.Threading.DispatcherPriority.Normal,
new System.Windows.Threading.DispatcherOperationCallback
(delegate
{
C3.Opacity = 100;
C3Dot.Opacity = 100;
MIDIMain.noteOffNumber = -1;
return null;
}), null);
break;
case 61:
D3Dot.Dispatcher.BeginInvoke(
System.Windows.Threading.DispatcherPriority.Normal,
new System.Windows.Threading.DispatcherOperationCallback
(delegate
{
D3Dot.Opacity = 100;
D3Dot.Opacity = 100;
MIDIMain.noteOnNumber = -1;
return null;
}), null);
break;
}
感谢您的所有帮助!
MIDIMain.noteOnNumber
的值吗? - Rohit VatsmidiIn_MessageReceived()
的人,我没有看到任何事件。 - sllmidiIn
是在哪里实例化的?看起来只有在StartMonitoring()
中实例化了? - sll