// C# Eval Expression

// Doc: https://eval-expression.net/linq-dynamic

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// @nuget: Z.Expressions.Eval

​

/*

## LINQ SumDynamic Method

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The LINQ SumDynamic returns the sum of a sequence of numeric values. You can use a dynamic string expression to select a specific column.

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In this example, we will create a list of product and sum the length of all product name characters.

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See more: https://eval-expression.net/linq-dynamic

*/

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using System;

using System.Collections.Generic;

using System.Linq;

using Z.Expressions;

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public class Program

{

    public static void Main()

    {

        var product1 = new Product() { Name = "C# Eval Expression", Url = "https://eval-expression.net/", Type = "Paid" };

        var product2 = new Product() { Name = "Dapper Plus", Url = "https://dapper-plus.net/", Type = "Paid" };

        var product3 = new Product() { Name = "Entity Framework Extensions", Url = "https://entityframework-extensions.net/", Type = "Paid" };

        var list = new List<Product>() { product1, product2, product3 };

        var sum = list.SumDynamic<Product, int>("x => x.Name.Length");

        Console.Write("Nb characters for all products: {0}", sum);

    }

    public class Product

    {

        public string Name { get; set; }

        public string Url { get; set; }

        public string Type { get; set; }

    }

}

​

​