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Calling Method in another class

Posted on 2011-09-05
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Last Modified: 2012-05-12
AppendTextBox1 is defined in my Form1 class. How can I call it from another class to append text to my TextBox1?

using System;

namespace Program
{
  class MyClass
  {
    public MyClass()
    {
      AppendTextBox1("Hello World from MyClass" + Environment.NewLine);
    }
  }
}

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using System;
using System.Windows.Forms;

namespace Program
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }

    // This delegate enables asynchronous calls for setting
    // the text property on the textBox1 control.
    delegate void AppendTextBox1Delegate(string text);


    /* Call this method to append text to textBox1 */
    public void AppendTextBox1(string text)
    {
      if (this.textBox1.InvokeRequired)
      {
        AppendTextBox1Delegate d = new AppendTextBox1Delegate(AppendTextBox1);
        this.textBox1.Invoke(d, new object[] { text });
      }
      else
      {
        this.textBox1.AppendText(text);
      }
    }


    private void button1_Click(object sender, EventArgs e)
    {
      AppendTextBox1("Hello World from button1_Click" + Environment.NewLine);
      MyClass m = new MyClass();   //test
    }
  }
}

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0
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Question by:deleyd
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1 Comment
 
LVL 63

Accepted Solution

by:
Fernando Soto earned 2000 total points
ID: 36484918
Hi deleyd;

Make the following change to Form1

MyClass m = new MyClass(this);   //test

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Then make the following changes to MyClass.

private Form1 parentForm = null;

public MyClass(Form1 pForm1  )
{
    parentForm = pForm1;
    parentForm.AppendTextBox1( "Hello World from MyClass" + Environment.NewLine );
}

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MyClass needs a reference to the class it is calling. So to be able to call functions in Form1 from MyClass, MyClass needs a reference to Form1. One way to do that is to have the constructor of MyClass to receive a reference to a form it will be communicating with.

Fernando
0

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