EasyExpression 1.0.4

EasyExpression

依赖

• .netstandard 2.0

支持的功能

• 逻辑运算
• 算术运算
• 条件运算
• 函数嵌入
• 优先级解构
• 外部传入实参

函数扩展

在EasyExpression.FormulaAction下可以实现更多函数

逻辑运算

0d 表示 false 1d 表示 true

示例

• 逻辑表达式

 var expStr = "3 * (1 + 2) < != 5 || !(8 / (4 - 2) > [SUM](1,2,3))";
 // 解析表达式树
 var exp = new Expression(expStr);
 // 把表达式中的数据加载到表达式对应的节点
 exp.LoadArgument();
 // 按表达式树逐级执行结果
 var value = exp.Excute();

  var expStr = "a * (b + c) > d & [Contains](srcText,text)";
  var dic = new Dictionary<string, string>
  {
      { "a","3"},
      { "b","1"},
      { "c","2"},
      { "d","4"},
      { "srcText","abc"},
      { "text","bc"},
  };
  var exp = new Expression(expStr);
  exp.LoadArgument(dic);
  var value = exp.Excute();

• 算术表达式

var expStr = "3 * (1 + 2) + 5 - (30 / (4 - 2) % [SUM](1,2,3))";
var exp = new Expression(expStr);
exp.LoadArgument();
var value = exp.Excute();

• 外部传入实参

 var expStr = "a * (b + c) + 5 - (30 / (d - 2) % [SUM](1,2,3))";
 var dic = new Dictionary<string,string>
 {
    { "a","3"},
    { "b","1"},
    { "c","2"},
    { "d","4"},
 };
 var exp = new Expression(expStr);
 // 外部实参注入到表达式树中
 exp.LoadArgument(dic);
 var value = exp.Excute();