一个简单的公式计算库
本库用于满足项目中数值公式计算需求
var formulaEvaluator = new FormulaEvaluator(
typeof(MyMath), // 设置可以在公式中使用的静态方法
new DefaultValueStrategy() // 设置变量值null时策略
);
var context = new FormulaEvaluatingContext
{
VariableProvider = new MyVariableProvider() // 设置变量值来源
};
double result = await formulaEvaluator.EvalAsync("1+${Foo}", context);1 // 整形
1.234 // 浮点数
100% // 百分数
${变量}
(1+(2-3))*4/5
Math.Abs(${变量})
具体语法参见ANTLR文件
FormulaEvaluator为线程安全的，可以在多个线程中使用
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