Looping through labels with similar name C#

Question

I want to change the background of some labels depending on what is written on a text file:

private void Form3_Load(object sender, EventArgs e)
        {
            string[] words = new string[7];
            StreamReader read = new StreamReader(path);
            while(!read.EndOfStream)
            {
                string line = read.ReadLine();
                words = line.Split(';');
                if(words[6] == "no") 
                {
                    //-----What I have to write here---
                }              
            }
            read.Close();
        }

There are over 50 labels named "lbl101","lbl102","....","lbl150"

I think its not clear what your asking. On what condition you want to wich label ? — , Mar 24 '16 at 14:56

Roman · Answer 1 · 2016-03-24T15:11:14.370

1

try it:

if(words[6] == "no") 
{
    int count = 150;
    for (int a = 1 ; a < count; a++)
    {
        Label currentLabel = (Label)this.Controls.Find("lbl"+a,true)[0];    
        //change color of currentLabel
    }
}

edited Mar 24 '16 at 15:11

answered Mar 24 '16 at 14:50

Roman

11,966
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It doesn't work, it cannot convert type System.Windows.Form.Controls[] to System.Windows.Form.Label – adrianoBP Mar 24 '16 at 15:07

score 1 · Answer 2 · edited May 23 '17 at 12:13

You can iterate all over them using OfType<T>() method on Controls collection of form like:

if(words[6] == "no") 
{
    foreach(var label in this.Controls.OfType<Label>().Where(x=>x.Name.Contains("lbl")))
    {
         label.Text = "Some Text";
    }
}

This will only work on the labels that are direct child of form, labels nested inside other user controls or nested panels will not be affected, for that you have to do it recursively.

score 1 · Accepted Answer · answered Mar 24 '16 at 15:17

There's the working solution:

private void Form3_Load(object sender, EventArgs e)
        {
            int count = 101;
            string[] words = new string[7];
            StreamReader read = new StreamReader(pathRooms);
            while(!read.EndOfStream)
            {
                string line = read.ReadLine();
                words = line.Split(';');
                if (words[6] == "no")
                {

                        Label currentLabel = (Label)this.Controls.Find("lbl" + count, true)[0];
                        currentLabel.BackColor = Color.Yellow;

                }
                count = count + 1;
            }
            read.Close();
        }

score 0 · Answer 4 · answered Mar 24 '16 at 14:52

0

Loop through the Controls collection of the form checking for Label objects. Then, amend accordingly as per the specified value.

answered Mar 24 '16 at 14:52

ManoDestra

6,325
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score 0 · Answer 5 · answered Mar 24 '16 at 15:11

1.) Create a List with all the labels.

Label lbl101 = new Label();
Label lbl102 = new Label();
...

List<Label> labels = new List<Label>()
{
    lbl101,
    lbl102
...
};

2.) If your words[] string is the name of the color you can write:

if(words[6] == "no") 
{
   System.Drawing.Color myColor = System.Drawing.ColorTranslator.FromHtml(words[..]);
   foreach(Label l in Labels)
   {
       l.BackColor = myColor;
   }
}

Looping through labels with similar name C#

5 Answers5

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