判断两个字符相似度 #region 判断两个字符相似度//公式：l = q/(q+r+s);PRivate string Similarity(string a, string b){
string a1 = "";string b1 = "";
//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.ToString("P", provider);}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.ToString("P", provider);
}
}#endregion
装载http://blog.sina.com.cn/s/blog_5f254b8a0100t4hy.html
参考文章：http://www.360doc.com/content/09/0201/10/96202_2430832.shtml