Question

I have a list and I am trying to find a particular element and then I want to edit that element.

storage.First(item => item.dirty == true).dirty = false; 

However this doesn’t appear to work since I am guessing First is creating another list and populating it. Is there a function to do what I am I am trying to do?

Here is the data type I am using:

class BaseRegister {
  public bool dirty {set;get;}
}

List <BaseRegister> storage = new List <BaseRegister> ();

Answer 1

There must be something else wrong with your program which is confusing you. For the avoidance of doubt, here is a complete program using your data types. The output is:

---Before---
True
False
True
---After---
False
False
True

The code is:

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

namespace ConsoleApplication40 {
  internal class Program {
    private static List<BaseRegister> storage=new List<BaseRegister>();

    private static void Main(string[] args) {
      storage.Add(new BaseRegister {dirty=true});
      storage.Add(new BaseRegister {dirty=false});
      storage.Add(new BaseRegister {dirty=true});
      Dump("---Before---");
      storage.First(item => item.dirty==true).dirty=false;
      Dump("---After---");
    }

    private static void Dump(string title) {
      Debug.WriteLine(title);
      foreach(var br in storage) {
        Debug.WriteLine(br.dirty);
      }
    }

    private class BaseRegister {
      public bool dirty { set; get; }
    }
  }
}