Question

I have a class.

public class abc
{
    public int i = 0;
    public string a = "";
}

=======================================

Now, I am inserting some records in list of type abc class

List<abc> c = new System.Collections.Generic.List<abc>();
abc a = new abc();
a.a = "1";
a.i = 1;
c.Add(a);

a = new abc();
a.a = "1";
a.i = 2;
c.Add(a);

===========================================

Creating a list variable and adding some filtered records.

List<abc> temp = new System.Collections.Generic.List<abc>();

temp.AddRange(c.Where(i => i.i == 1));

===============================================

Query = by executing the below lines of code will change the c variable as well.

I know both points to same memory location. Is there any way to fix this code?

foreach (abc d in temp)
{
    d.i = 10;
}

Answer 1

Create clones of your objects whenever you need to. For example, if i and a were properties — which they should totally be! — you could have written

temp.AddRange(c.Where(i => i.i == 1).Select(o => new abc { a = o.a, i = o.i}));