获取随机按钮

Question

我有按钮1-2-3 ... 12，我想随机得到其中4个（不重复），然后给他们一个单一的颜色，例如红色。我怎样才能做到这一点？

public Form1() 
    { 
     InitializeComponent(); 

     Button[] LeftArr = new Button[12] { button1, button2, button3, button4, button5, button6, button7, button8, button9, button10, button11, button12 }; 

     int i = 0; 
     for (i = 0; i <= LeftArr.Length; i++) 
     { 
      Random rnd = new Random(); 
      Button ShipHere = rnd.Next(button1, button12); 

      // this is where i'm stuck 
     } 

Answer 1

首先，您要确保在循环的每次迭代中都不要创建新的Random对象。否则，你将最终重复。

Random rnd = new Random(); 

List<Button> randomButtons = new List<Button>(4); 

for (int i = 0;i < 4;++i) 
{ 
    Button chosenButton; 

    // Keep looping until we get a button we haven't already picked 
    do 
    { 
     chosenButton = LeftArr[rnd.Next(0, LeftArr.Length)]; 
    } while (randomButtons.Contains(chosenButton)); 

    randomButtons.Add(chosenButton); 
} 

foreach (Button button in randomButtons) 
    button.BackColor = Color.Red;