千萬不要重複一些名字

Question

我正在使用c＃winforms。當我點擊一個按鈕時，程序會顯示列表中的2個單詞，但有時單詞會重複。如何我不給不讓的話重複

這是代碼

private void button1_Click(object sender, EventArgs e) 
{ 
    var words = new[] { "Worm", "Fast", "Death", "boat", "Sneak", "Destroction" }; 
    var wordsInRandomOrder = words.OrderBy(i => Guid.NewGuid()); 

    foreach (var word in wordsInRandomOrder) 
    { 
     textBox1.Text = word; 
     break; 
    } 

    foreach (var word in wordsInRandomOrder) 
    { 
     textBox1.Text = textBox1.Text + " " + word; 
     break; 
    } 
} 

Answer 1

選項1：

private void button1_Click(object sender, EventArgs e) 
{ 
    var words = new[] { "Worm", "Fast", "Death", "boat", "Sneak", "Destroction" }; 
    var wordsInRandomOrder = words.OrderBy(i => Guid.NewGuid()).ToList(); 
    textBox1.Text = wordsInRandomOrder[0] + " " + wordsInRandomOrder[1]; 
} 

選項2：

var words = new[] { "Worm", "Fast", "Death", "boat", "Sneak", "Destroction" }; 
Random rd = new Random(); 

int firstIndex = rd.Next(0, words.Length); 
int secondIndex = rd.Next(0, words.Length); 

while (secondIndex == firstIndex) 
{ 
    secondIndex = rd.Next(0, words.Length); 
} 

textBox1.Text = words[firstIndex] + " " + words[secondIndex]; 

Answer 2

Random rd = new Random(); 

int firstIndex = rd.Next(0, words.Length); 
int secondIndex = rd.Next(0, words.Length); 

while (secondIndex == firstIndex) 
{ 
    secondIndex = rd.Next(0, words.Length); 
} 

textBox1.Text = words[firstIndex] + " " + words[secondIndex]; 

Answer 3

一類似的方法，不會使用Guid：

private void button1_Click(object sender, EventArgs e) 
{ 
    Random r = new Random(); 
    var words = new[] { "Worm", "Fast", "Death", "boat", "Sneak", "Destroction" }; 
    var wordsInRandomOrder = words.OrderBy(i => r.Next()).ToList(); 

    textBox1.Text = String.Join(" ", wordsInRandomOrder.Take(2)); 
} 

隨着甚至如果隨機數發生器產生兩次相同的數，你從你的列表中取一個字，因爲他們只是下令這appraoch（這是相當不可能的）。如果兩件商品具有相同的訂單價值，則它們可以任意訂購，但同一件商品不能使用兩次。

Answer 4

如果realllllly想保持你使用，在第二foreach的代碼，你可以這樣做：

foreach (var word in wordsInRandomOrder) 
{ 
    if(word != textBox1.Text) 
    { 
     textBox1.Text = textBox1.Text + " " + word; 
     break; 
    } 
} 

，但更好的辦法是爲juharr寫道：

textBox1.Text = string.Join(" ", wordsInRandomOrder.Take(2)); 

如果你想走循環路線，最好加入 這兩個「foreach es」你有這樣的樣子：

foreach (string word in wordsInRandomOrder) 
{ 
    if(textBox1.Text = "") 
    { 
     textBox1.Text = word; 
    } 
    else 
    { 
     if(textBox1.Text != word) 
     { 
      textBox1.Text = textBox1.Text + " " + word; 
      break; 
     } 
    } 
}