仅供参考：
#region 字符串函数计算 ////// 字符串函数运算 /// 格式1：@函数名(参数1,参数2...) /// 格式2：@函数名(参数1,参数2...)+@函数名(参数1,参数2...)-@函数名(参数1,参数2...).... /// /// ///private decimal StringToFunction(string str) { decimal result = 0; //是否带有运算符 if (Regex.IsMatch(str, @"[\+|\-|\*|\/]")) { //替换所有运算符，方便分析函数(参数) var newstr = Regex.Replace(str, @"[\+|\-|\*|\/]", "(*_*)"); //函数结果容器 List list_decimal = new List (); foreach (string hs in newstr.Split(new string[] { "(*_*)" }, StringSplitOptions.None).ToList()) { var dec = GetData(hs); list_decimal.Add(dec); } //运算符 var matches = Regex.Matches(str, @"[\+|\-|\*|\/]"); for (int de = 0; de < list_decimal.Count; de++) { if (de == 0) { result += list_decimal[de]; } else { switch (matches[de - 1].Value) { case "+": result += list_decimal[de]; break; case "-": result -= list_decimal[de]; break; case "*": result *= list_decimal[de]; break; case @"/": result /= list_decimal[de]; break; } } } } else //不带运算符 { result = GetData(str); } return result; } /// /// 数据获取 /// /// ///private decimal GetData(string str) { decimal result = 0; //解析函数 var modelFunction = GetFunction(str); switch (modelFunction.funname.ToLower()) { case "xj_je": break; case "jqy": //result = JQY(modelFunction.parameter); break; case "-jqy": //result = JQY(modelFunction.parameter); break; case "nc": result = NC(modelFunction.parameter); break; case "ye": result = YE(modelFunction.parameter); break; } return result; } #endregion /// /// 获取函数名 /// /// 字符串 ///private ModelFunction GetFunction(string str) { string funname = Regex.Replace(str, @"@|(\(.+\))", ""); List parameter = new List (); var p = Regex.Matches(str, @"\d+"); for (int i = 0; i < p.Count; i++) { parameter.Add(p[i].Value); } ModelFunction model = new ModelFunction() { funname = funname, parameter = parameter }; return model; } private class ModelFunction { /// /// 函数名称 /// public string funname { get; set; } ////// 参数 /// public Listparameter { get; set; } }