Why does order change when I sort elements by property that is the same in the every element?
This is my example:
public class MyClass
{
private int _id;
public int Id
{
get { return _id; }
set { _id = value; }
}
private string _name;
public string Name
{
get { return _name; }
set { _name = value; }
}
public override string ToString()
{
return "Id = " + _id.ToString() + "\tName = " + _name.ToString();
}
}
public class SortByName : IComparer<MyClass>
{
int IComparer<MyClass>.Compare(MyClass x, MyClass y)
{
return x.Name.CompareTo(y.Name);
}
}
....
List<MyClass> list = new List<MyClass>();
MyClass obj = new MyClass();
obj.Id = 1;
obj.Name = "A";
list.Add(obj);
obj = new MyClass();
obj.Id = 2;
obj.Name = "A";
list.Add(obj);
obj = new MyClass();
obj.Id = 3;
obj.Name = "A";
list.Add(obj);
Console.WriteLine("List before sort");
foreach (MyClass o in list)
Console.WriteLine(o.ToString());
SortByName byName = new SortByName();
list.Sort(byName);
Console.WriteLine("\nList after first sort");
foreach (MyClass o in list)
Console.WriteLine(o.ToString());
list.Sort(byName);
Console.WriteLine("\nList after second sort");
foreach (MyClass o in list)
Console.WriteLine(o.ToString());
Console.Read();
.....
After first sort order is changed, after second sort order is original.
What do I have to do to avoid this strange behavior? I don`t want change order if I sort by property that is the same in every element. I also don`t want sort to times because I have a large list and it can cause blink on the screen.