Textbox array does not update in a User Control

Hello everyone,

I am attempting to build a User Control with a collection of TextBoxes. The idea is to be able to display a collection of information.

I can get a single Textbox to update, but I just can't get an array to do the same thing.

The function _aTextBox() is called from 2 buttons on my main program as follows:

private void button1_Click(object sender, EventArgs e)
{
ucTextBox1._aTextBox("Hello",0);
}
private void button2_Click(object sender, EventArgs e)
{
ucTextBox1._aTextBox("World",1);
}

Any and all suggestions welcomed . Many thanks for your time reading this.

My User Control code is below:

At the line marked with // *********************, txt[0].Text holds the correct string. However, it never displays it!!!

namespace ucTextBox
{
public partial class ucTextBox: UserControl
{
public ucTextBox()
{
InitializeComponent();
}
TextBox[] txt = new TextBox[2];
private void DisplayTextBoxes()
{
txt[0] = new TextBox();
txt[0].Location = new System.Drawing.Point(20, 48);
this.Controls.Add(txt[0]);
}
public void _aTextBox(string text)
{
DisplayTextBoxes();
txt[0].Visible = false;
txt[0].Text = text; // *********************
txt[0].Visible = true;
txt[0].Invalidate();
txt[0].Update();
txtValue.Visible = true;
txtValue.Text = text;
txt[0].ResumeLayout(true);
}
}
}

Try this

public partial class ucTextBox : UserControl
{
int index;
Point p;
public ucTextBox()
{
InitializeComponent();
}
private void ucTextBox_Load(object sender, EventArgs e)
{
p.X = 0;
p.Y = 4;
}
TextBox[] txt = new TextBox[0];
private void DisplayTextBoxes()
{
Array.Resize(ref txt, txt.Length +1);
index = txt.Length - 1;
txt[index] = new TextBox();
txt[index].Location = new System.Drawing.Point(p.X, p.Y);
p.Y = p.Y + txt[index].Height + 5;
this.Controls.Add(txt[index]);
}
public void _aTextBox(string text)
{
DisplayTextBoxes();
txt[txt.Length - 1].Visible = false;
txt[txt.Length - 1].Text = text + txt.Length.ToString(); // *********************
txt[txt.Length - 1].Visible = true;
txt[txt.Length - 1].Invalidate();
txt[txt.Length - 1].Update();
txt[txt.Length - 1].ResumeLayout(true);
}
}

If you want to arrange the text boxes into columns, you will need to count the # of text boxes you want per column then change the p.X value to start a new coulm n and reset the p.Y back to the start pos of 1st text box in column.

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

theLizard6y ago
Try this
public partial class ucTextBox : UserControl
{
    int index;
    Point p;
    public ucTextBox()
    {
      InitializeComponent();
    }

    private void ucTextBox_Load(object sender, EventArgs e)
    {
p.X = 0;
p.Y = 4;
    }
    TextBox[] txt = new TextBox[0];

    private void DisplayTextBoxes()
    {
     Array.Resize(ref txt, txt.Length +1);
      index = txt.Length - 1;

      txt[index] = new TextBox();

      txt[index].Location = new System.Drawing.Point(p.X, p.Y);

      p.Y = p.Y + txt[index].Height + 5;

      this.Controls.Add(txt[index]);
    }
    public void _aTextBox(string text)
    {
      DisplayTextBoxes();
      txt[txt.Length - 1].Visible = false;
      txt[txt.Length - 1].Text = text + txt.Length.ToString(); // *********************
      txt[txt.Length - 1].Visible = true;
      txt[txt.Length - 1].Invalidate();
      txt[txt.Length - 1].Update();
      txt[txt.Length - 1].ResumeLayout(true);
    }
}
If you want to arrange the text boxes into columns, you will need to count the # of text boxes you want per column then change the p.X value to start a new coulm n and reset the p.Y back to the start pos of 1st text box in column.
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