C # dynamic Lambda Expressions

With a string of powerful Nuget package can be easily analyzed and executed Lambda expressions format: System.Linq.Dynamic.Core

github: https://github.com/StefH/System.Linq.Dynamic.Core

 

 

// anonymous class

// anonymous class 
var a = new {Age = 1 , Name = " little sister"};

Type aType = a.GetType();

var dataParameter = Expression.Parameter (aType, "data"); // define data => data type and

var expar = DynamicExpressionParser.ParseLambda (new [] {dataParameter}, typeof (bool), "data.Age> 5 && data.Name == \" little brother \ ""); // field name may be written in lower case (Age == age) it is very convenient 

// Perform Lambda expressions
 var result = cancelExpr.Compile().DynamicInvoke(a);
//  outPut:  false;
// equivalent to: var result = a.Age> 5 && a.Name == "little brother";



    

　　

    public class Teach
    {
        public string Name { get; set; }

        public int Age { get; set; }

        public string AddressInfo { get; set; }

    }

　　

        var list = new List<Teach>();


        for (int i = 0; i< 10; i++)
        {
             var tearch = new Teach
             {
                 Name = "小" + i,
                 Age = i
             };

        list.Add(tearch);

        }

    Type type = typeof(Teach);

    var dataParameter = Expression.Parameter(type, "data");
    var expr = DynamicExpressionParser.ParseLambda(new[] { dataParameter }, typeof(bool), "data.Age > 5 && data.Name == \"小6\"");
    // or
    var expr1 = DynamicExpressionParser.ParseLambda<Teach, bool>(ParsingConfig.Default, true, "age > 5 && name == \"小6\"");
    var res = list.Where(t => (bool)expr.Compile().DynamicInvoke(t)).ToList();
    var res2 = list.Where(expr1.Compile()).ToList();