如何以編程方式將控件添加到窗體？

Question

我試圖在面板中添加一個控件（標籤）。 請參閱代碼：

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 

namespace AddControlProgramatically 
{ 
    public partial class Form1 : Form 
    { 
     public Form1() 
     { 
      InitializeComponent(); 
     } 

     private void button1_Click(object sender, EventArgs e) 
     { 
      Label lbl = new Label(); 

      for (int x = 0; x <= 3; x++) 
      { 
       //create new label location after each loop 
       //by multiplying the new value of variable x by 5, so the new label 
       //control will not overlap each other. 
       lbl.Location = new System.Drawing.Point(52 + (x * 5), 58 + (x * 5)); 
       //create new id and text of the label 
       lbl.Name = "label_" + x.ToString(); 
       lbl.Text = "Label " + x.ToString(); 

       this.panel1.Controls.Add(lbl); 
      } 
     } 
    } 
} 

這裏的形式。我試圖完成的是以編程方式生成3個不同的控制標籤。但正如你所看到的，它只顯示最後一個。請幫助我解決這個問題。我知道我的代碼有問題（因爲它不工作）。謝謝...

Answer 1

將Label lbl = new Label();放入循環中。

，使偏移較大，改變了...

lbl.Location = new System.Drawing.Point(52 + (x * 5), 58 + (x * 5)) 

...到：

lbl.Location = new System.Drawing.Point(52 + (x * 30), 58 + (x * 30)) 

Answer 2

您需要在每次循環迭代中創建一個新標籤。現在你只能創建一個標籤。

private void button1_Click(object sender, EventArgs e) 
{ 
    for (int x = 0; x <= 3; x++) 
    { 
     Label lbl = new Label(); 

     //create new label location after each loop 
     //by multiplying the new value of variable x by 5, so the new label 
     //control will not overlap each other. 
     lbl.Location = new System.Drawing.Point(52 + (x * 5), 58 + (x * 5)); 
     //create new id and text of the label 
     lbl.Name = "label_" + x.ToString(); 
     lbl.Text = "Label " + x.ToString(); 

     this.panel1.Controls.Add(lbl); 
    } 
} 

Answer 3

你需要把你的Label lbl = new Label();循環for裏面。