Handler for an array of controls created in code

•

What is DaniWeb IT Discussion Community?

You're currently browsing the C# section within the Software Development category of DaniWeb, a massive community of 423,497 software developers, web developers, Internet marketers, and tech gurus who are all enthusiastic about making contacts, networking, and learning from each other. In fact, there are 4,678 IT professionals currently interacting right now! Registration is free, only takes a minute and lets you enjoy all of the interactive features of the site.

Join our community!

Please support our C# advertiser: Programming Forums

Thread Tools Display Modes

Views: 461 | Replies: 2 | Solved

•

Join Date: Jun 2008

Posts: 7

Reputation: Ken-Barrie is an unknown quantity at this point

Rep Power: 0

Solved Threads: 0

Ken-Barrie Ken-Barrie is offline

Offline

Newbie Poster

Handler for an array of controls created in code

Jun 21st, 2008

I create an array of 16 text boxes, etc in code. I need to detect which one is clicked. I have created an event handler for each that points to the same handler routine for all 16

for(int box = 0; box < 16; box ++)
{
txtArray[box].Click += new System.EventHandler(txtArray_n_Click);
}

There I get stuck trying to identify which one called the handler. Been reading up on Delegates, but I'm not sure which direction to travel from here. I could spend a lot of time on that path to no profit other than my own education!

Any pointers?

•

Join Date: Feb 2008

Location: Sivakasi, Tamilnadu, India

Posts: 454

Reputation: selvaganapathy is an unknown quantity at this point

Rep Power: 1

Solved Threads: 78

selvaganapathy selvaganapathy is offline

Offline

Posting Pro in Training

Re: Handler for an array of controls created in code

Jun 21st, 2008

Hi, When create the textbox give unique name. And in Click event you receive the sender object, Typecast it to textbox and check the name you want.

Ex

 Help with Code Tags 
 C# Syntax (Toggle Plain Text) 
    TextBox[] textArray;
    public Form1()
    {
        InitializeComponent();
        textArray = new TextBox[10];
        for (int i = 0; i < 10; i++)
        {
            TextBox textBox = new TextBox();
 
            textBox.Name = "Name" + i ;
            textBox.Location = new Point(0, (i + 1) * textBox.Height);
            textArray[i] = textBox;
            textArray[i].Click += new EventHandler(ArrayOnClick);
            this.Controls.Add(textBox); 
        }
    }
    TextBox[] textArray;
    public Form1()
    {
        InitializeComponent();
        textArray = new TextBox[10];
        for (int i = 0; i < 10; i++)
        {
            TextBox textBox = new TextBox();
            
            textBox.Name = "Name" + i ;
            textBox.Location = new Point(0, (i + 1) * textBox.Height);
            textArray[i] = textBox;
            textArray[i].Click += new EventHandler(ArrayOnClick);
            this.Controls.Add(textBox); 
        }
    }

 Help with Code Tags 
 C# Syntax (Toggle Plain Text) 
private void ArrayOnClick(object sender, EventArgs e)
    {
        TextBox textBox =(TextBox) sender;
        MessageBox.Show(textBox.Name ); 
        switch ( textBox.Name ){
            case "Name0":
                //Code for Name0 TextBox
 
                break;
            case "Name1":
                //Code for Name1 TextBox
                break;
 
        }
    }
private void ArrayOnClick(object sender, EventArgs e)
    {
        TextBox textBox =(TextBox) sender;
        MessageBox.Show(textBox.Name ); 
        switch ( textBox.Name ){
            case "Name0":
                //Code for Name0 TextBox
                
                break;
            case "Name1":
                //Code for Name1 TextBox
                break;

        }
    }

KSG

•

Join Date: Jun 2008

Posts: 7

Reputation: Ken-Barrie is an unknown quantity at this point

Rep Power: 0

Solved Threads: 0

Ken-Barrie Ken-Barrie is offline

Offline

Newbie Poster

Re: Handler for an array of controls created in code

Jun 22nd, 2008

Yes. That will do nicely.

Your
textBox.Name = "Name" + i ;

becomes, for me
txtArray[i].Name = i.ToString();

[Shame on me. Why did I not think of giving them a name!]

Then I pick up your line in the handler

TextBox textBox =(TextBox) sender;

And I’m away, with a reference to which one is knocking at the door.

I was frustrated that the event handler did not pass me enough info in the Sender object or EventArgs to determine which control I was dealing with. I could determine the text in the box but not the name. IT HAD NO NAME.