// C# Eval Expression

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

​

// @nuget: Z.Expressions.Eval

​

/*

## LINQ SelectManyDynamic Method

​

The LINQ SelectManyDynamic projects each element of a sequence to an IEnumerable and flattens the resulting sequences into one sequence. You can use a dynamic string expression to select a specific column.

​

In this example, we will dynamically select products from different catalog, and returns the full products list.

​

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

*/

​

using System;

using System.Collections.Generic;

using System.Linq;

using Z.Expressions;

​

public class Program

{

    public static void Main()

    {

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

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

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

        var product4 = new Product() { Name = ".NET Fiddle", Url = "https://dotnetfiddle.net/" };

        var product5 = new Product() { Name = "SQL Fiddle", Url = "https://sqlfiddle.com/" };

        var product6 = new Product() { Name = "ZZZ Code AI", Url = "https://zzzcode.ai/" };

        var catalog1 = new Catalog() { Type = "Paid", Products = new List<Product>() { product1, product2, product3 }};

        var catalog2 = new Catalog() { Type = "Free", Products = new List<Product>() { product4, product5, product6 }};

        var catalogs = new List<Catalog>() { catalog1, catalog2 };

        var products = catalogs.SelectManyDynamic("x => x.Products").ToList();

        FiddleHelper.WriteTable("1 - products:", products);

    }

    public class Catalog 

    {

        public string Type { get; set; }

        public List<Product> Products { get; set; }

    }

    public class Product

    {

        public string Name { get; set; }

        public string Url { get; set; }

    }

}

​

​