本类适用于比较2个字符的相似度，代码如下：

using System;using System.Collections.Generic;using System.Text;public class StringCompute{ #region 私有变量 /// <summary> /// 字符串1 /// </summary> private char[] _ArrChar1; /// <summary> /// 字符串2 /// </summary> private char[] _ArrChar2; /// <summary> /// 统计结果 /// </summary> private Result _Result; /// <summary> /// 开始时间 /// </summary> private DateTime _BeginTime; /// <summary> /// 结束时间 /// </summary> private DateTime _EndTime; /// <summary> /// 计算次数 /// </summary> private int _ComputeTimes; /// <summary> /// 算法矩阵 /// </summary> private int[,] _Matrix; /// <summary> /// 矩阵列数 /// </summary> private int _Column; /// <summary> /// 矩阵行数 /// </summary> private int _Row; #endregion #region 属性 public Result ComputeResult { get { return _Result; } } #endregion #region 构造函数 public StringCompute(string str1, string str2) { this.StringComputeInit(str1, str2); } public StringCompute() { } #endregion #region 算法实现 /// <summary> /// 初始化算法基本信息 /// </summary> /// <param name="str1">字符串1</param> /// <param name="str2">字符串2</param> private void StringComputeInit(string str1, string str2) { _ArrChar1 = str1.ToCharArray(); _ArrChar2 = str2.ToCharArray(); _Result = new Result(); _ComputeTimes = 0; _Row = _ArrChar1.Length + 1; _Column = _ArrChar2.Length + 1; _Matrix = new int[_Row, _Column]; } /// <summary> /// 计算相似度 /// </summary> public void Compute() { //开始时间 _BeginTime = DateTime.Now; //初始化矩阵的第一行和第一列 this.InitMatrix(); int intCost = 0; for (int i = 1; i < _Row; i++) { for (int j = 1; j < _Column; j++) { if (_ArrChar1[i - 1] == _ArrChar2[j - 1]) { intCost = 0; } else { intCost = 1; } //关键步骤，计算当前位置值为左边+1、上面+1、左上角+intCost中的最小值 //循环遍历到最后_Matrix[_Row - 1, _Column - 1]即为两个字符串的距离 _Matrix[i, j] = this.Minimum(_Matrix[i - 1, j] + 1, _Matrix[i, j - 1] + 1, _Matrix[i - 1, j - 1] + intCost); _ComputeTimes++; } } //结束时间 _EndTime = DateTime.Now; //相似率 移动次数小于最长的字符串长度的20%算同一题 int intLength = _Row > _Column ? _Row : _Column; _Result.Rate = (1 - (decimal)_Matrix[_Row - 1, _Column - 1] / intLength); _Result.UseTime = (_EndTime - _BeginTime).ToString(); _Result.ComputeTimes = _ComputeTimes.ToString(); _Result.Difference = _Matrix[_Row - 1, _Column - 1]; } /// <summary> /// 计算相似度（不记录比较时间） /// </summary> public void SpeedyCompute() { //开始时间 //_BeginTime = DateTime.Now; //初始化矩阵的第一行和第一列 this.InitMatrix(); int intCost = 0; for (int i = 1; i < _Row; i++) { for (int j = 1; j < _Column; j++) { if (_ArrChar1[i - 1] == _ArrChar2[j - 1]) { intCost = 0; } else { intCost = 1; } //关键步骤，计算当前位置值为左边+1、上面+1、左上角+intCost中的最小值 //循环遍历到最后_Matrix[_Row - 1, _Column - 1]即为两个字符串的距离 _Matrix[i, j] = this.Minimum(_Matrix[i - 1, j] + 1, _Matrix[i, j - 1] + 1, _Matrix[i - 1, j - 1] + intCost); _ComputeTimes++; } } //结束时间 //_EndTime = DateTime.Now; //相似率 移动次数小于最长的字符串长度的20%算同一题 int intLength = _Row > _Column ? _Row : _Column; _Result.Rate = (1 - (decimal)_Matrix[_Row - 1, _Column - 1] / intLength); // _Result.UseTime = (_EndTime - _BeginTime).ToString(); _Result.ComputeTimes = _ComputeTimes.ToString(); _Result.Difference = _Matrix[_Row - 1, _Column - 1]; } /// <summary> /// 计算相似度 /// </summary> /// <param name="str1">字符串1</param> /// <param name="str2">字符串2</param> public void Compute(string str1, string str2) { this.StringComputeInit(str1, str2); this.Compute(); } /// <summary> /// 计算相似度 /// </summary> /// <param name="str1">字符串1</param> /// <param name="str2">字符串2</param> public void SpeedyCompute(string str1, string str2) { this.StringComputeInit(str1, str2); this.SpeedyCompute(); } /// <summary> /// 初始化矩阵的第一行和第一列 /// </summary> private void InitMatrix() { for (int i = 0; i < _Column; i++) { _Matrix[0, i] = i; } for (int i = 0; i < _Row; i++) { _Matrix[i, 0] = i; } } /// <summary> /// 取三个数中的最小值 /// </summary> /// <param name="First"></param> /// <param name="Second"></param> /// <param name="Third"></param> /// <returns></returns> private int Minimum(int First, int Second, int Third) { int intMin = First; if (Second < intMin) { intMin = Second; } if (Third < intMin) { intMin = Third; } return intMin; } #endregion}/// <summary>/// 计算结果/// </summary>public struct Result{ /// <summary> /// 相似度 /// </summary> public decimal Rate; /// <summary> /// 对比次数 /// </summary> public string ComputeTimes; /// <summary> /// 使用时间 /// </summary> public string UseTime; /// <summary> /// 差异 /// </summary> public int Difference;}

调用方法：

// 方式一StringCompute stringcompute1 = new StringCompute();stringcompute1.SpeedyCompute("对比字符一", "对比字符二"); // 计算相似度， 不记录比较时间decimal rate = stringcompute1.ComputeResult.Rate; // 相似度百分之几，完全匹配相似度为1// 方式二StringCompute stringcompute2 = new StringCompute();stringcompute2.Compute(); // 计算相似度， 记录比较时间string usetime = stringcompute2.ComputeResult.UseTime; // 对比使用时间