CODEWITHSUNDEEP
linq-to-objects
Jarvis Bot
Jarvis Bot

Reputation: 491

Extension method for UPDATE in Linq to Objects

In the following scenario, I am querying a List object and for the matching predicate I want to update some values:

var updatedList = MyList
                 .Where (c => c.listItem1 != "someValue")  
                 .Update (m => {m.someProperty = false;});

The only issue is there is no Update extension method. How to go about this?

My objective is update only those items in my list which match the condition leaving the other items intact.

Upvotes: 1

Views: 7849

Answers (3)

omatase
omatase

Reputation: 1721

Or you could use an extension method that comes with the .Net framework:

var updatedList = MyList
                 .Where (c => c.listItem1 != "someValue")  
                 .ForEach(m => m.someProperty = false);

Upvotes: 4

Rob
Rob

Reputation: 1328

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var people = new List<Person> {
                new Person{Name="aaa", Salary=15000, isHip=false}
                ,new Person{Name="aaa", Salary=15000, isHip=false}
                ,new Person{Name="bbb", Salary=20000, isHip=false}
                ,new Person{Name="ccc", Salary=25000, isHip=false}
                ,new Person{Name="ddd", Salary=30000, isHip=false}
                ,new Person{Name="eee", Salary=35000, isHip=false}
            };


            people.Where(p => p.Salary < 25000).Update(p => p.isHip = true);

            foreach (var p in people)
            {
                Console.WriteLine("{0} - {1}", p.Name, p.isHip);
            }


        }
    }

    class Person
    {

        public string Name { get; set; }
        public double Salary { get; set; }
        public bool isHip { get; set; }
    }


    public static class LinqUpdates
    {

        public static void Update<T>(this IEnumerable<T> source, Action<T> action)
        {
            foreach (var item in source)
                action(item);
        }

    }


}

Upvotes: 8

Bryan Watts
Bryan Watts

Reputation: 45465

foreach(var item in MyList.Where(c => c.listItem1 != "someValue"))
{
    item.someProperty = false;
}

Upvotes: 1

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