Pass value from Class to Form control

Question

3.00/5 (2 votes)

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This is driving me nuts!

Form1.cs = Press btnClass and it starts Class1.cs

C#

public partial class Form1 : Form
{
    private readonly Class1 cls = new Class1();

C#

private void btnClass_Click(object sender, EventArgs e)
{
    Thread clsThread = new Thread(StartClass1);
    clsThread.Start();
}
private void StartClass1()
{
    // Class1.cs
    cls.BeginClass();
}

Class1.cs = stuff happens then updates label.Text located in Form1

I've tried using delegates and it works, but the problem I need those delegates to send the value from Class1 to Form1 label. :doh:

C#

class Class1
{
    public void BeginClass()
    {
        // Needs to pass value back to label created in Form1
        // ClassDone(); - start events
    }
    public event ClassDoneEventHandler ClassDoneEvent;
    private void ClassDone()
    {
        ClassDoneEvent(new ClassDoneEventArgs());
    }
    # region ClassDone
    public delegate void ClassDoneEventHandler(ClassDoneEventArgs e);
    public class ClassDoneEventArgs : EventArgs
    {
    }
    # endregion
}

Any Help Appreciated!! ;)

Posted 18-Feb-11 9:39am

Bobbydoo8

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Comments

Sergey Alexandrovich Kryukov 18-Feb-11 16:44pm

Please don't name it "BeginClass". You cannot begin a class, you can start a thread.
I appreciate you created a wrapper for the thread, so many fail to get benefits of it. Rename Class1 one to "ThreadWrapper", BegingClass to "Start".
Don't consider naming as annoyance, names are very important.
--SA

3 solutions

Solution 3

Genius John Simmons,

You have no idea how much time you just saved me. Here's the code all put together.

C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;

Form1.cs

C#

namespace PassData
{
    public partial class Form1 : Form
    {
        private readonly Class1 cls = new Class1();
        public Form1()
        {
            InitializeComponent();
            cls.ClassDoneEvent += new PassData.Class1.ClassDoneEventHandler(class1_ClassDoneEvent);
        }
        private void class1_ClassDoneEvent(PassData.Class1.ClassDoneEventArgs e)
        {
            //e.Value will be SomeValue
            label1.Invoke(new UpdateLabelTextDelegate(UpdateLabelText), e.Value.ToString());
        }
        private delegate void UpdateLabelTextDelegate(string text);
        private void UpdateLabelText(string text)
        {
            // Actual Label updated with text.
            label1.Text = text;
        }
        private void btnClose_Click(object sender, EventArgs e)
        {
            Close();
        }
        private void btnClass_Click(object sender, EventArgs e)
        {
            Thread clsThread = new Thread(StartClass1);
            clsThread.Start();
        }
        private void StartClass1()
        {
            // Class1.cs
            cls.BeginClass();
        }
    }
}

Class1.cs

C#

namespace PassData
{
    class Class1
    {
        public void BeginClass()
        {
            ClassDone();
        }
        public event ClassDoneEventHandler ClassDoneEvent;
        private void ClassDone()
        {
            ClassDoneEvent(new ClassDoneEventArgs());
        }
        public delegate void ClassDoneEventHandler(ClassDoneEventArgs e);
        public class ClassDoneEventArgs : EventArgs
        {
            public string Value
            {
                get
                {
                    // The value to be passed to Form1.cs
                    return "SomeValue";
                }
            }
        }
    }
}

apaka, appreciate the response as well, going to have to look into that.

Posted 18-Feb-11 10:33am

Bobbydoo8

Updated 18-Feb-11 10:36am

v2

Solution 2

dotnetperls.com/backgroundworker Try using this.

Posted 18-Feb-11 9:59am

apaka

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#realJSOP · Accepted Answer · 2011-02-18T09:57:00

You can put the values into the ClassDoneEventArgs object

C#

public class ClassDoneEventArgs : EventArgs    
{    
    public object Value { get; set; }
    public ClassDoneEventArgs(object value)
    {
        this.Value = value;
    }
}

And the when you call your event poster, do this:

C#

private void OnMyEvent()
{
   MyEvent(this, new ClassDoneEventArgs(myValue));
}