Modify a form's control properties from a class

[carlossan]

Hello,

If I have a class that does some calculations and I want to show the result of those calculations on a form's textbox, how can I do that ?

I have tried writing the following on the class, but it doesn't work:

form1.textbox1.text = showData(initialValues);

Where show data is one of the class' methods and it returns a string.

form1 also shows some other data that doesn't have anything to do with the method showData. showData is invoked by pressing a button on form1.

Thanks.

Regards,

Carlos

 

[chiph]

Take a look at my replies here: thread732-1163547

Chip H.


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[carlossan]

Hi Chip H.,

I looked at your replies but I am not sure how can I apply them to the problem I'm having. Let me try to express myself better:

I have a form called Form1 with a single control: a textBox called textBox1.

I added a class to that project called Class1. The code for Class1 is:

using System;
using System.Collections.Generic;
using System.Text;

namespace useFormsControlsFromAnotherForm
{
class Class1
{
public void ChangeText()
{
Form1.TextBox1.Text = "Hi There";
}

}
}

I can't change the text of TextBox1 using the ChangeText method.

Regards,

Carlos

 

[JurkMonkey]

Hi Carlos,

You have run into a situation where you need to communicate between instances of forms and objects to change their properties.

If this is a small project, then the simple solution would be to "Register" your form with your class.

namespace useFormsControlsFromAnotherForm
{
class Class1
{
private Form1 registeredForm;

public void RegisterMyForm(Form1 frm)
{
registeredForm = frm;
}


public void ChangeText()
{
registeredForm.textbox1.Text = "Hi There";
}

}
}

Your textbox will have to be public in order to do this. Instead of a public textbox, you might just want to make a public method SetText1Text(string text)

public void SetText1Text(string text)
{
this.textbox1.Text = text;
}

This is usually the preferred method.


If this is a larger project, you will want to familiarize yourself with the Model - View - Controller design pattern. This will let you set properties of many objects through one common place (the controller)

Happy Googling!