DynamicExpresso

DynamicExpresso 

动态Expression

安装包：DynamicExpresso.Core 

Student.cs

     

        public class Student
        {
            public int Age { get; set; }
            public string Name { get; set; }

            public void Hello()
            {
                Console.WriteLine(string.Format("hello, my name is {0}, my age is {1}", Name, Age));
            }

            public static Student Instance()
            {
                return new Student() { Name = "auto", Age = 0 };
            }
        }

1、生成动态委托

static void Main(string[] args)
{List<Student> students = new List<Student>();for (int i = 0; i < 10; i++){students.Add(new Student{Age = new Random().Next(15, 80),Name = Guid.NewGuid().ToString(),});}string whereExpression = "student.Age > 18 && index >=0";//相当于 students.Where((student, index) => s.Age > 18)var interpreter = new Interpreter();Func<Student, int, bool> dynamicWhere = interpreter.ParseAsDelegate<Func<Student, int, bool>>(whereExpression, "student", "index");//index 为元素索引Expression<Func<Student, int, bool>> dynamicExpressionWhere = interpreter.ParseAsExpression<Func<Student, int, bool>>(whereExpression, "student", "index");// (student, index) => ((student.Age > 18) AndAlso (index >= 0))var value = students.Where(dynamicWhere).ToList();
}

2、调用实体成员

达到类似反射效果

static void Main(string[] args)
{var stu = new Student() { Name = "mango", Age = 30 };var target = new Interpreter().SetVariable("stu", stu);target.Reference(typeof(Student));Console.WriteLine(target.Eval("stu.Hello()"));Console.WriteLine(target.Eval("stu.Name"));Console.WriteLine(target.Eval("new Student().Hello()"));Console.WriteLine(target.Eval("Student.Instance().Hello()"));
}