Updating single Column of List without Foreach Loop

Question

I have a List

List<Myclass> li = new List<Myclass> ();

where Myclass is

public class Myclass
{
    public string ExamName { get; set; }
    public Nullable<decimal> Marks { get; set; }
    public Nullable<decimal> OutOfMarks { get; set; }
    public string GradeMarks { get; set; }
    public Nullable<decimal> markEaxmTotalOverAll { get; set; }
    public Nullable<decimal> MarksExamTotalMarksTypeWise { get; set; }
    public Nullable<decimal> MarksExamOutOfMarksTotalOverAll { get; set; }
    public Nullable<decimal> MarksExamOutOfMarksTotalMarksTypeWise { get; set; }
}

li contains almost 10000 items
i want to set markEaxmTotalOverAll value to 50 in all 10000 items
but don't want to do it with loop , Is there any way to update it , I tried this code

li.Select(s => { s.MarksExamTotalOverAll = 50; return s; }); 

but its not working

Answer 1

As the Q of LINQ says, the basic usage of LINQ is to query , not to update .

The less verbose form of foreach is the ForEach method of List<T> :

li.ForEach(z => z.MarksExamTotalOverAll = 50);

Answer 2

Try this code which runs specified task in a parallel manner

 List<Myclass> li = new List<Myclass>();
 Parallel.ForEach(li, l => l.MarksExamOutOfMarksTotalOverAll = 50);

Answer 3

使用List<T>.ForEach

li.ForEach(x=>x.MarksExamTotalOverAll = 50);