判断两个字符相似度

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public static double SimilarityNoContains(string a, string b) {     string a1 = "";     string b1 = "";     if (a==b)     {         return 1;     }              //消除重复     for (int i = 0; i < a.Length; i++)     {         string emtpy = a.Substring(i, 1).ToString();         if (a1.Length == 0)         {             a1 = emtpy;         }         if (a1.IndexOf(emtpy, 0) < 0)         {             a1 += emtpy;         }     }     //消除重复     for (int i = 0; i < b.Length; i++)     {         string emtpy = b.Substring(i, 1).ToString();         if (b1.Length == 0)         {             b1 = emtpy;         }         if (b1.IndexOf(emtpy, 0) < 0)         {             b1 += emtpy;         }     }     //计算相似度     if (a1.Length >= b1.Length)     {         int q = 0;         for (int i = 0; i < b1.Length; i++)         {             for (int j = 0; j < a1.Length; j++)             {                 if (b1.Substring(i, 1).ToString() == a1.Substring(j, 1).ToString())                 {                     q += 1;                 }             }         }         System.Globalization.NumberFormatInfo provider = new System.Globalization.NumberFormatInfo();         provider.PercentDecimalDigits = 2;//小数点保留几位数.         provider.PercentPositivePattern = 1;//百分号出现在何处.         double result = (double)q / (a1.Length + b1.Length - q);//一定要用double类型.         return result;     }     else     {         int q = 0;         for (int i = 0; i < a1.Length; i++)         {             for (int j = 0; j < b1.Length; j++)             {                 if (a1.Substring(i, 1).ToString() == b1.Substring(j, 1).ToString())                 {                     q += 1;                 }             }         }         System.Globalization.NumberFormatInfo provider = new System.Globalization.NumberFormatInfo();         provider.PercentDecimalDigits = 2;//小数点保留几位数.         provider.PercentPositivePattern = 1;//百分号出现在何处.         double result = (double)q / (a1.Length + b1.Length - q);//一定要用double类型.         return result;       }     }