Control in a List does not equate to the original control

Question

So I have a list(panelList) that I created and I inserted 10 Panel controls (which are already created on the aspx design page).. However, when I try and check if panelList[0] is the same panel as Panel1(which is the first panel I added in panelList), I get returned FALSE... any idea why? Here is my code

 static List<Panel> panelList = new List<Panel>();
 protected void Page_Load(object sender, EventArgs e)
 {
 if (!IsPostBack) 
        {
            panelList.Add(Panel1);
            panelList.Add(Panel2);
            panelList.Add(Panel3);
            panelList.Add(Panel4);
            panelList.Add(Panel5);
            panelList.Add(Panel6);
            panelList.Add(Panel7);
            panelList.Add(Panel8);
            panelList.Add(Panel9);
            panelList.Add(Panel10);
         } 
  }  

   protected void AddQuestionButton_Click(object sender, EventArgs e)
      {    
       Debug.WriteLine(panelList[0].Equals(Panel1));
      // here i get returned false in the debug output
      }

Anything you did with Panel1 inbetween adding to the list and checking if it equals? — Gertjan Brouwer, Dec 30 '19 at 12:28
`Panel1` is got from aspx layout: it means after post back (clicking AddQuestionButton) control is restored from form data and it is not the same objects as was added to static list. `Equals` behavior might be implemented with different way for not the same object reference. — Oleg Bondarenko, Dec 30 '19 at 12:40
@GertjanBrouwer nope, i only went through a loop and made all the panels invisible.. — Sandro Ramirez, Dec 30 '19 at 12:46
is there anyway i can make the equals comparison turn to true @OlegBondarenko — Sandro Ramirez, Dec 30 '19 at 12:47
@SandroRamirez you could compare `Id` property they are unique for each aspx controls. — Oleg Bondarenko, Dec 30 '19 at 13:19

score 1 · Answer 1 · answered Dec 30 '19 at 12:55

1

You should consider How to compare 2 object in c#, There are some ways to achieve this

Implement IEquatable<T>
Serialize both objects then compare them as string result

BTW, this link is helpful for you.

answered Dec 30 '19 at 12:55

Nguyễn Văn Phong

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Control in a List does not equate to the original control

1 Answers1