c# - 如何交换字符串变量中的两个字符？

Question

我有一个字符串变量。我想交换字符串单词中的两个字符。我想随机交换两个彼此靠近的字符。

这是我所做的:我已经这样做了，但在某些方面我得到了错误。

string word = txtWord.Text;
Random rand = new Random();
int randomNumber= rand.Next(0, word.Length);
string swappedWord = SwapCharacters(lastWord, randomNumber, randomNumber + 1);

private string SwapCharacters(string value, int position1, int position2)
{
    char[] array = value.ToCharArray(); // Convert a string to a char array
    char temp = array[position1]; // Get temporary copy of character
    array[position1] = array[position2]; // Assign element
    array[position2] = temp; // Assign element
    return new string(array); // Return string
}

Answer 1

使用 StringBuilder:

//如果要替换

StringBuilder sb = new StringBuilder(theString);
    sb[index] = newChar;
    theString = sb.ToString();

//交换

 string input = "AXBYCZ"; //Sample String
    StringBuilder output = new StringBuilder();

    char[] characters = input.ToCharArray();

    for (int i = 0; i < characters.Length; i++)
    {
      if (i % 2 == 0)
      {
        if((i+1) < characters.Length )
        {
          output.Append(characters[i + 1]);
        }
                   output.Append(characters[i]);
      }
    }