我正在尝试为C＃中的作业设计钢琴。我创建了一个MusicKey类来存储音乐键（以及BlackMusicKey类）。我在面板“ panel1”中填充如下音乐键：
this.panel1.Controls.Add(bmk);
在音乐键构造器中，我为每个音乐键设置位置和大小，并确保将“可见性”设置为true。但是，当我运行该表单时，它是完全空白的。
有什么我想念的吗？我非常确定音乐键的可见性没有问题，因此在使面板可见方面确实缺少一些东西。
任何帮助将不胜感激，谢谢！
注意：我还尝试使用panel1.Show()仍然无法正常工作。
所有相关代码都可以在下面找到：
MusicKeyClass：
class MusKey : System.Windows.Forms.Button
{
private int musicNote; //determines the pitch mapped to number
public MusKey(int iNote, int x, int y) : base()
{
musicNote = iNote;
this.Location = new System.Drawing.Point(x, y);
this.Size = new System.Drawing.Size(20, 80);
this.Visible = true;
}
public int getMusicNote()
{
return musicNote;
}
}
Form1类：
public partial class Form1 : Form
{
int count = 0;
int xLoc = 50;
int yLoc = 30;
int[] whitePitch = { 1, 3, 5, 6, 8, 10, 12, 13, 15, 17, 18, 20, 22, 24 };
Panel panel1 = new Panel();
System.Windows.Forms.Timer timer1 = new System.Windows.Forms.Timer();
Button button1 = new Button();
private void Form1_Load(object sender, EventArgs e)
{
this.Paint += new PaintEventHandler(function);
MusKey mk;
BlackMusKey bmk;
for (int k = 0; k < 14; k++)
{
int pitch = whitePitch[k];
int ixPos = k * 20;
mk = new MusKey(pitch, ixPos, yLoc);
mk.MouseDown += new MouseEventHandler(this.button1_MouseDown);
mk.MouseUp += new MouseEventHandler(this.button1_MouseUp);
this.panel1.Controls.Add(mk);
}
int xOffs = 20;
int[] blackPitch = { 2, 4, 7, 9, 11, 14, 16, 19, 21, 23 };
int[] xPos = { 10, 30, 70, 110, 150, 170, 210, 230, 250 };
const int yPosBlack = 50;
for (int k = 0; k < 10; k++)
{
int pitch = blackPitch[k];
int ixPos = xPos[k];
bmk = new BlackMusKey(pitch, ixPos, yPosBlack);
bmk.MouseDown += new System.Windows.Forms.MouseEventHandler(this.button1_MouseDown); //create event MouseDown
bmk.MouseUp += new System.Windows.Forms.MouseEventHandler(this.button1_MouseUp); //create event MouseUp
this.panel1.Controls.Add(bmk);
this.panel1.Controls[this.panel1.Controls.Count - 1].BringToFront();
}
}
SoundPlayer sp = new SoundPlayer();
int count1;
private void button1_MouseDown(object sender, MouseEventArgs e)
{
foreach (MusKey mk in this.panel1.Controls)
{
if (sender == mk)
{ //true for the specific key pressed on the Music Keyboard
if (e.Button == MouseButtons.Left)
{
timer1.Enabled = true; //variable of the Timer component
count = 0; //incremented by the timer1_Tick event handler
timer1.Start();
sp.SoundLocation = (mk.getMusicNote() + ".wav"); //might need to convert ToString() ??
sp.Play();
}
}
}
}
private void timer1_Tick(object sender, EventArgs e)
{
count = count++;
}
private void button1_MouseUp(object sender, MouseEventArgs e)
{
foreach (MusKey mk in this.panel1.Controls)
{
if (sender == mk) //true for the specific key pressed on the Music Keyboard
{
if (e.Button == MouseButtons.Left)
{
timer1.Enabled = false;
sp.Stop();
string bNoteShape = null;
int duration = 0;
if (count >= 16)
{
bNoteShape = "SemiBreve";
duration = 16;
}
if (count >= 8 && count <= 15)
{
bNoteShape = "DotMinim";
duration = (8 + 15) / 2;
}
if (count >= 4 && count <= 7)
{
bNoteShape = "Crotchet";
duration = (4 + 7) / 2;
}
if (count >= 2 && count <= 3)
{
bNoteShape = "Quaver";
duration = (2 + 3) / 2;
}
if (count >= 1)
{
bNoteShape = "Semi-Quaver";
duration = 1;
}
MusicNote mn = new MusicNote(mk.getMusicNote(), duration, bNoteShape); //music note construction
// mn.Location = new Point(xLoc, yLoc);
//this.panel2.Controls.Add(this.mn); //adding MusicNote component to MusicStaff (panel2) collection
xLoc = xLoc + 15;
}
}
}
}
private void function(object sender, PaintEventArgs e)
{
panel1.Show();
panel1.Visible = true;
panel1.BackColor = Color.Blue;
panel1.Size = new Size(5, 5);
panel1.Location = new Point(3, 3);
this.Controls.Add(panel1);
this.Controls.Add(button1);
}
private void Form1_Load_1(object sender, EventArgs e)
{
}
}
Form 1 [designer]类：
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.SuspendLayout();
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 20F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(800, 450);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load_1);
this.ResumeLayout(false);
}
#endregion
}
音符类
class MusicNote
{
public int notepitch;
public String noteshape;
public int noteduration;
enum accid { sharp, flat, sole };
bool dragging = false;
System.Timers.Timer timer1 = new System.Timers.Timer();
public MusicNote(int iNotepitch, int iDuration, String iBnoteShape)
{
notepitch = iNotepitch;
noteduration = iDuration;
noteshape = iBnoteShape;
}
bool timeron = false;
bool changenote = false;
public static int start = 0;
//public void click(object sender, MouseEventArgs e) { }
//public void RightPress(object sender, MouseEventArgs e) { }
}
}
黑色音乐键类
class BlackMusKey : MusKey
{
public BlackMusKey(int iNote, int x, int y) : base(iNote, x, y)
{
this.BackColor = Color.Black;
this.Size = new System.Drawing.Size(20, 60);
}
}
程序类
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
答案 0 :(得分：0)
根据Form1类代码，缺少构造函数。请使用InitializeComponent()方法调用添加适当的构造函数。可以将其添加到类正文中的任何位置。
代码段：
public partial class Form1 : Form
{
[...] //your objects declarations
public Form1()
{
InitializeComponent();
}
[...] //rest of your code
}
请接受正确的答案。