Solved

Referencing Variable in For Loop

Posted on 2010-11-29
7
387 Views
Last Modified: 2013-12-17
I am almost 100% sure this is possible but I can't seem to get it to work.

I have a for loop and I am trying to use the Loop iterator to reference the value in a text box.

I have 5 text boxes that I want to grab the text out of the box when the for loop increments.  i tried it with brackets around the variable but I get and error stating 'txtUnit1Tag' does not exist in the current context.  How can I reference the text box txtUnit1Tag1 using i ?


for(int i=1; i<5; i++)
{
   value = txtUnit1Tag[i].Text;              
}

Open in new window

0
Comment
Question by:rkneal
7 Comments
 
LVL 33

Expert Comment

by:jppinto
ID: 34234941
Please try this...
for(int i=1; i<5; i++)
{
   value = FindControl("txtUnit1Tag" & i, Me).Text;              
}

Open in new window

0
 
LVL 85

Expert Comment

by:Mike Tomlinson
ID: 34234953
WebForms or WinForms?
0
 

Author Comment

by:rkneal
ID: 34235003
Windows Forms
0
Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

 

Author Comment

by:rkneal
ID: 34235043
jppinto - When i try that I get the name 'FindControl' doe snot exist in the current context, followed by Operator & cannot be applied to operands of type 'string and 'int'.
0
 
LVL 85

Accepted Solution

by:
Mike Tomlinson earned 63 total points
ID: 34235050
For WinForms, try something like:
private void button1_Click(object sender, EventArgs e)
        {
            Control[] ctls;
            for (int i = 1; i < 5; i++)
            {
                ctls = this.Controls.Find("txtUnit1Tag" + i.ToString(), true);
                if (ctls.Length > 0 && ctls[0] is TextBox)
                {
                    TextBox tb = (TextBox)ctls[0];
                    MessageBox.Show(tb.Text, tb.Name, MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
            }
        }

Open in new window

0
 
LVL 9

Assisted Solution

by:shadow77
shadow77 earned 62 total points
ID: 34236587
If you have a form named MainForm with five TextBoxes named textBox1 thru textBox5, this code will do what you want.

To create MainForm_Load, use the Properties window in the Forms Designer to add an event handler for Load (you can't just add the method; you need the triggering mechanism).  MainForm_Load may contain other code as well; this is just what you need to add.

Note that you cannot simply initialize the txtUnit[] array because the TextBoxes don't exist until after InitializeComponent() has been executed (you could also just put this code right after the call to InitializeComponent()).

You really only need the first seven lines.  Test39 just illustrates how to reference your TextBoxes.
TextBox[] txtUnit = new TextBox[5];       // an array that allows indexed access to a group of TextBoxes

    private void MainForm_Load(object sender, EventArgs e)
    {
        TextBox[] _txtUnit = { textBox1, textBox2, textBox3, textBox4, textBox5 };
        txtUnit = _txtUnit;
    }

    private void test39()
    {
        for (int i = 0; i < txtUnit.Length; ++i)
            txtUnit[i].Text = (i * i).ToString();
    }

Open in new window

0
 

Author Closing Comment

by:rkneal
ID: 34239225
Used a combination of both your suggestions to accomplish my end result.  Thanks for your assistance.
0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
This article aims to explain the working of CircularLogArchiver. This tool was designed to solve the buildup of log file in cases where systems do not support circular logging or where circular logging is not enabled
Microsoft Active Directory, the widely used IT infrastructure, is known for its high risk of credential theft. The best way to test your Active Directory’s vulnerabilities to pass-the-ticket, pass-the-hash, privilege escalation, and malware attacks …
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…

816 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now