C# how to access form property from another form

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1.00/5 (3 votes)

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using vsstudio (c#)..
given the sample code below is my form property(form1), i want to use it to my (form2).. please help.. TIA..

What I have tried:

public void frmproperty()
       {
           this.CenterToScreen();
           this.Text = "frmlogin";
           this.MaximizeBox = false;
           this.MinimizeBox = false;
       }

Posted 14-Apr-17 4:08am

akosisugar

Updated 14-Apr-17 4:28am

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2 solutions

Solution 1

This is not a Property (of course it belongs to the form) - this is a Method.
If you want to access something on Form1 from Form2 you should create a reference to Form1.

For example :http://stackoverflow.com/questions/20286176/how-to-call-function-from-another-form

Posted 14-Apr-17 4:24am

Ralf Meier

Updated 14-Apr-17 4:27am

v3

Comments

akosisugar 14-Apr-17 10:29am

yes sir.. a method called 'frmproperty'. i call this method in form2 in form_load event.. but it didnt work..

Ralf Meier 14-Apr-17 10:31am

See the Link I have posted an also the Links in then 2nd Solution from OG ...

akosisugar 14-Apr-17 10:36am

private void frmmain_Load(object sender, EventArgs e)
{
Form1 f = new Form1();

f.frmproperty();
}

code in my form2

Ralf Meier 14-Apr-17 10:41am

OK ... and now ? What happens ? Is this what you want to get ?

akosisugar 14-Apr-17 10:45am

the form1 property did not copied in form2

Ralf Meier 14-Apr-17 11:32am

The method from Form1 could not be copied to Form2.
You have the following possibilities :
- You could get (if it is a Property) it's result.
- You could it's result if it is not void.
And
- You could execute it if it is a method ...

But ...
what are you trying to achieve ?

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OriginalGriff · Accepted Answer · 2017-04-14T04:28:00

frmproperty is a method, and it's public - so all you need is the form instance in order to call it. And there's the rub - how do you get the form instance? should you get the form instance? Difficult to tell, without knowing more about how your forms are related.
There are three different scenarios:
1) Form1 creates and opens the Form2 instance (Form1 is the "parent", Form2 is the "child")
2) Form2 creates and opens the Form1 instance (Form2 is the "parent", Form1 is the "child")
3) Form3 creates and opens both Form1 and Form2. (Form3 is the "parent", Form1 and Form2 are the "children")

How this should be handles depends on which scenario your software is using, because "children" should not know that "parents" even exist, let alone what class they are and thus what properties and methods they contain.
See one of these:
Transferring information between two forms, Part 1: Parent to Child[^]
Transferring information between two forms, Part 2: Child to Parent[^]
Transferring information between two forms, Part 3: Child to Child[^]
They mostly deal with properties, but it's exactly the same for methods.

Quote:
so this means my idea is impossible to work?

Basically, yes - in the form you are trying to do it, anyway.
You're trying to do something that isn't right. There are ways to do what you want:
1) Create a static method (or an extension method) for the Form class and pass it the Form instance you want to "adjust" - this will only work if the method sticks to standard Form properties and methods, it can't do anything specific to a derived class.

C#

public static class GeneralMethods
   {
   public static void Adjust(Form f)
      {
      f.CenterToScreen();
      f.Text = "frmlogin";
      f.MaximizeBox = false;
      f.MinimizeBox = false;
      }
   }
...
   GeneralMethods.Adjust(this);

2) Create a base class for all your forms that contains the method, and derive your forms from that. The base method is available directly in all derived forms without any reference to the base class.

C#

public class MyForm : From
   {
   public void Adjust()
      {
      CenterToScreen();
      Text = "frmlogin";
      MaximizeBox = false;
      MinimizeBox = false;
      }
   }
...
public class Form1 : MyForm
   {
   ...
      Adjust();
   ...
   }
public class Form2 : MyForm
   {
   ...
      Adjust();
   ...
   }

In reality, MyForm would be an abstract form, but that gives problems with the Visual studio designer, so for the moment, just leave it at that!