关于我之前发布的问题，我正在创建一个c＃piano，它将显示一个键盘，当点击音乐键时，它将显示音符形状并输出音乐声。但是，我遇到了另一个问题。当我单击音乐键时，它会输出所需的图像，但是当我再次以另一个持续时间点击另一个时，相同的图像保持不变。有人可以帮我这个吗？
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Media;
using System.IO;
using System.Reflection;
using System.Diagnostics;
namespace NewPiano
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
SoundPlayer sp = new SoundPlayer();
long count;
private Control mn;
Stopwatch watch = new Stopwatch();
private void Form1_Load(object sender, System.EventArgs e)
{
MusKey mk;
BlackMusKey bmk;
int[] whitePitch = { 1, 3, 5, 6, 8, 10, 12, 13, 15, 17, 18, 20, 22, 24 };
int[] blackPitch = new int[] { 2, 4, 7, 9, 11, 14, 16, 19, 21, 23 };
int[] xPos = new int[] { 10, 30, 70, 90, 110, 150, 170, 210, 230, 250 };
for (int k = 0; k < 7; k++)
{
int iNote = whitePitch[k];
int xpos = k * 40;
mk = new MusKey(iNote, xpos + 150, 120);
mk.MouseDown += new System.Windows.Forms.MouseEventHandler(this.button1_MouseDown);
mk.MouseUp += new System.Windows.Forms.MouseEventHandler(this.button1_MouseUp);
this.panel1.Controls.Add(mk);
}
int xOffs = 20;
for (int k = 0; k < 5; k++)
{
int iNote = blackPitch[k];
int xpos = xPos[k] * 2;
bmk = new BlackMusKey(iNote, xpos + 150, 120);
bmk.MouseDown += new System.Windows.Forms.MouseEventHandler(this.button1_MouseDown);
bmk.MouseUp += new System.Windows.Forms.MouseEventHandler(this.button1_MouseUp);
this.panel1.Controls.Add(bmk);
this.panel1.Controls[this.panel1.Controls.Count - 1].BringToFront();
}
}
private void button1_MouseDown(object sender, MouseEventArgs e)
{
watch.Reset();
foreach (MusKey mk in panel1.Controls.OfType<MusKey>())
{
if (sender == mk)
{
if (e.Button == MouseButtons.Left)
{
watch.Start();
count = 0;
sp.SoundLocation = @"C:/Users/Kim/Desktop/Notes-Sound files/mapped/" + mk.musicNote + ".wav"; //change this to the location of your "mapped" folder
sp.Load();
sp.Play();
}
}
}
}
private void button1_MouseUp(object sender, MouseEventArgs e)
{
foreach (MusKey mk in panel1.Controls.OfType<MusKey>())
{
if (sender == mk)
{
if (e.Button == MouseButtons.Left)
{
watch.Stop();
count = watch.ElapsedMilliseconds;
}
sp.Stop();
int duration = 0;
string bNoteShape = null;
int pitch = 0;
if (count >=2024)
{
bNoteShape = "SemiBreve";
duration = (16 + 20) / 2;
pitch = 1;
}
else if ((count >= 1024) && (count < 2024))
{
bNoteShape = "DotMinim";
duration = (11 + 15) / 2; //average
pitch = 2;
}
else if ((count >= 768) && (count < 1024))
{
bNoteShape = "minim";
duration = (6 + 10) / 2; //average
pitch = 3;
}
else if ((count >= 512) && (count < 768))
{
bNoteShape = "Crotchet";
duration = (3 + 5) / 2; //average
pitch = 4;
}
else if ((count >= 256 && count < 512))
{
bNoteShape = "Quaver";
duration = 2; //average
pitch = 5;
}
else if ((count == 0 || count < 256))
{
bNoteShape = "SemiQuaver";
duration = 1;
pitch = 6;
}
MusicNote mn = new MusicNote(count, pitch, bNoteShape, duration);
panel1.Controls.Add(mn.drawNote());
watch.Restart();
}
}
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
System.Drawing.Graphics graphicsObj;
graphicsObj = this.panel1.CreateGraphics();
Pen myPen = new Pen(System.Drawing.Color.Black, 1);
for (int k = 0; k < 5; k++)
{
int ypos = (k * 15) + 20;
graphicsObj.DrawLine(myPen, 20, ypos, 550, ypos);
}
}
}
}
音乐笔类：
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace NewPiano
{
class MusicNote
{
public long noteID;
public int pitch = 0;
public string shape = "";
public int duration = 0;
public MusicNote() { }
public MusicNote(long count, int mpitch, string shape, int duration)
{
this.noteID = count;
this.shape = shape;
this.duration = duration;
this.pitch = mpitch;
}
public PictureBox drawNote()
{
PictureBox noteDrawing = new PictureBox();
noteDrawing.Size = new System.Drawing.Size(40, 40);
noteDrawing.Location = new System.Drawing.Point(10, 10);
noteDrawing.ImageLocation = @"C:/Users/Kim/Desktop/Notes-Images/" + shape + ".bmp";
return noteDrawing;
}
/*public void PlayAllNotesOnClick()
{
System.Media.SoundPlayer player = new System.Media.SoundPlayer();
player.SoundLocation = "C:/Users/Kim/Desktop/Notes-Sound files/mapped/" + this.pitch + ".wav";
player.Play();
System.Threading.Thread.Sleep(duration + 100);
player.Stop();
}
*/
public void onDrag(int pitch)
{
if (pitch > 150 && pitch < 155)
{
this.pitch = 1;
}
if (pitch > 100 && pitch < 154)
{
this.pitch = 2;
}
if (pitch > 75 && pitch < 99)
{
this.pitch = 5;
}
if (pitch > 50 && pitch < 74)
{
this.pitch = 6;
}
//this.pitch = pitch;
}
}
}
答案 0 :(得分：1)
每次您的MouseUp事件触发时，您都会向Panel1.Controls集合中添加一个新的PictureBox。显示第一个，但后面的所有都不显示。要么它们不适合Panel1，要么它们位于第一个下面。
请尝试以下选项：