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CSharp · Console

/Program.cs

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

public class Program
{
	public void Main()
    {		      
		var John="test";
		IList<Item> items = new List<Item>();
		items.Add(new Item
		{
			 tag = "{Ann}",
			 value = "Anny"
		});
		
		items.Add(new Item
		{
			 tag = "{"+John+"}",
			 value = "Johnny"
		});	
		
		items.Where(o => o.tag == "{"+John+"}").ToList().ForEach(item =>{
		item.value = "jane";
		});
		
		items.ToList().ForEach(item => {
			Console.WriteLine(item.tag+"="+item.value);
		});
    }	
	
		
}

public class Item{
	public string tag {get;set;}
	public string value {get;set;}

}