关于老赵微博得一道题的解法

给出一种解决方案如下：
 internal class ConvertTool{static Random mRad = new Random();const int ConvertMinLength = 4;private static char[] SplitChars = new[] { ' ', ',', '.', '!' };/// 
/// 转换/// 
/// /// public static string ConverText(string textString){int textLength = textString.Length;var firstSplitCharIndex = textString.IndexOfAny(SplitChars);if (firstSplitCharIndex < ConvertMinLength){return textString;}StringBuilder stringBuilder = new StringBuilder(textString);int startRandomIndex = 1;const int randomStep = 2;var splitCharIndex = firstSplitCharIndex;while (splitCharIndex != -1 && splitCharIndex < textLength){ConvertWordToRandom(stringBuilder, startRandomIndex, splitCharIndex - randomStep);startRandomIndex = splitCharIndex + randomStep;splitCharIndex = textString.IndexOfAny(SplitChars, splitCharIndex + 1);Console.WriteLine("splitCharIndex-{0},startRandomIndex-{1}", splitCharIndex, startRandomIndex);}return stringBuilder.ToString();}/// 
/// 打乱某个单词/// 
/// /// /// static void ConvertWordToRandom(StringBuilder sb, int startIndex, int endIndex){if (startIndex >= endIndex){return;}var sourceIndex = startIndex;var validateLength = endIndex - startIndex;while (validateLength > 1){var targetIndex = mRad.Next(validateLength) + sourceIndex;SwitchToChar(sb, sourceIndex, targetIndex);sourceIndex++;validateLength = endIndex - sourceIndex;}}/// 
/// 替换指定两个位置的字符/// 
/// /// /// private static void SwitchToChar(StringBuilder sb, int sourceIndex, int targetIndex){if (sourceIndex == targetIndex || sourceIndex < 0 || sourceIndex >= sb.Length || targetIndex < 0 || targetIndex >= sb.Length){return;}char tempChar = sb[targetIndex];sb[targetIndex] = sb[sourceIndex];sb[sourceIndex] = tempChar;}}

转载于:https://www.cnblogs.com/ccchai/archive/2012/11/05/2755715.html

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