NullReferenceException이 (가) 해제되었습니다

Question

테이블 개체를 만들었습니다.

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; 

namespace GameMachineWF 
{ 
    public partial class Form1 : Form 
    { 
     Label firstClicked = null; 
     Label secoundClicked = null; 
     int rows; 
     int cols; 
     Random random = new Random(); 
     TableLayoutPanel table; 

    List<String> icons = new List<string>() 
{ 
"!", "!" , "N", "N", "Y", "Y", "k", "k", 
"," , ",", "b", "b", "w","w", "v", "v" 
}; 

    public Form1(int rows, int cols) 
    { 
     InitializeComponent(); 

     LoadGame(rows, cols); 
    } 

    public void LoadGame(int rows, int cols) 
    { 
     TableLayoutPanel table = new TableLayoutPanel(); 
     table.Dock = DockStyle.Fill; 
     table.ColumnCount = cols; 
     table.RowCount = rows; 
     table.BackColor = Color.CornflowerBlue; 

     for (int i = 0; i < rows; i++) 
     { 
      for (int j = 0; j < cols; j++) 
      { 
       Label label = new Label(); 
       label.Dock = DockStyle.Fill; 
       label.Name = "label" + i + "" + j; 
       label.Text = "c"; 
       label.Click += this.label_Click; 

       label.Size = new Size(100, 100); 
       label.Font = new Font("Webdings", this.Font.Size); 

       label.BorderStyle = BorderStyle.Fixed3D; 

       table.Controls.Add(label, i, j); 
       table.AutoSize = true; 
      } 
     } 

     this.Controls.Add(table); 

     this.Size = new Size(rows * 100 + 50, cols * 100 + 50); 

     foreach (Control control in table.Controls) 
     { 
      Label iconLabel = control as Label; 

      if (iconLabel != null) 
      { 
       int randomNumber = random.Next(icons.Count); 
       iconLabel.Text = icons[randomNumber]; 
       iconLabel.ForeColor = iconLabel.BackColor; 
       icons.RemoveAt(randomNumber); 
      } 
     } 
    } 

    private void tableLayoutPanel1_Paint(object sender, PaintEventArgs e) 
    { 
    } 

    private void label_Click(object sender, EventArgs e) 
    { 
     if (timer1.Enabled == true) 
      return; 

     Label clicklabel = sender as Label; 

     if (clicklabel != null) 
     { 
      if (clicklabel.ForeColor == Color.Black) 
      { 
       return; 
      } 

      if (firstClicked == null) 
      { 
       firstClicked = clicklabel; 
       firstClicked.ForeColor = Color.Black; 
       return; 
      } 
     } 

     secoundClicked = clicklabel; 
     secoundClicked.ForeColor = Color.Black; 
     formWinner(); 

     if (firstClicked.Text == secoundClicked.Text) 
     { 
      firstClicked = null; 
      secoundClicked = null; 
      return; 
     } 

     timer1.Start(); 
    } 

    private void timer1_Tick(object sender, EventArgs e) 
    { 
     timer1.Stop(); 
     firstClicked.ForeColor = firstClicked.BackColor; 
     secoundClicked.ForeColor = secoundClicked.BackColor; 
     firstClicked = null; 
     secoundClicked = null; 
    } 

    private void formWinner() 
    { 
     foreach (Control controls in table.Controls) 
     { 
      Label lblWin = controls as Label; 

      if (lblWin != null) 
      { 
       if (lblWin.ForeColor == lblWin.BackColor) 
       { 
        return; 
       } 
      } 
     } 

     MessageBox.Show("You won. Congratulations"); 
     Close(); 
    } 
} 

양식이 이벤트에서 인수를 가져옵니다 :

private void x4ToolStripMenuItem_Click(object sender, EventArgs e) 
{ 
     Form1 f1 = new Form1(4, 4); 
     f1.ShowDialog(); 
} 

NullReferenceException이이 FormWinner() 메소드에서 tablecontrols 요소에 unhalted 된 코드를 참조하십시오.

위 코드는 내가 일하고있는 쌍 게임을위한 게임으로, C#의 Microsoft Pair Game Tutorial에서 영감을 받았습니다.

Answer 1

방금 ​​클릭 이벤트 처리기를 LoadGame() 안에있는 라벨에 연결하는 것을 잊었습니까?

label.Click += this.label_Click;