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Good day

I made my textboxes reaadonly and I want to change the forecolor of the text inside of the textboxes.

I have written the following code, but it is not changing the forecolor of the text inside of the textbox to grey.

txtVersion.ForeColor = Color.Gray;


How can I change the forecolor of the text, when the textbox is made readonly?

Thanx
Posted
Updated 23-Mar-20 10:56am
v3

There is something odd about the ForeColor property of a read only System.Windows.Form.TextBox which I haven't seen documented, although I haven't looked very hard.

I've noticed that a foreground colour change only takes effect after the background colour has been changed once. After that any subsequent foreground changes take place immediately.

My little test app:
C#
using System;
using System.Drawing;
using System.Windows.Forms;

// Requires a form with 2 text boxes and 2 buttons

public partial class Form1 : Form {
  private readonly Color[] rainbow = new Color[] {
    Color.Red,
    Color.Orange,
    Color.Yellow,
    Color.Green,
    Color.Blue,
    Color.Indigo,
    Color.Violet
  };

  private Int32 foreIdx, backIdx;

  public Form1() {
    InitializeComponent();
    backIdx = rainbow.Length - 1;
    NormalTextBox.Text = "Standard text box";
    ReadOnlyTextBox.Text = "Read only text box";
  }

  private void ForeColBtn_Click(object sender, EventArgs e) {
    NormalTextBox.ForeColor = rainbow[foreIdx];
    ReadOnlyTextBox.ForeColor = rainbow[foreIdx];
    foreIdx = ++foreIdx % rainbow.Length;
  }

  private void BackColBtn_Click(object sender, EventArgs e) {
    NormalTextBox.BackColor = rainbow[backIdx];
    ReadOnlyTextBox.BackColor = rainbow[backIdx];
    backIdx = ++backIdx % rainbow.Length;
  }
}


Have fun,

Alan.
   
v2
Comments
Member 11391309 25-Mar-15 0:24am
   
dsf
You can't, without a lot of work.

When you set the textbox to readonly, the foreground and background colours are overridden and ignored in favour of the system disabled colors - and it is a BAAAAD idea to change them.

The easiest way to do it would be to create your own control, derived from TextBox and handle ReadOnly yourself - disable text entry via the KeyPress event and set the color yourself.
   
What I have done is, instead of using Readonly , I use Enabled.
   
Setting the BackColor property to any color before you set the ReadOnly property of a textbox to true solves the problem:

C#
private void setTextBoxReadOnly(TextBox txtBoxToChange)
{
    txtBoxToChange.BackColor = Color.Gray;
    txtBoxToChange.ForeColor = Color.Red;
    txtBoxToChange.ReadOnly = true;
}

private void setTextBoxNormal(TextBox txtBoxToChange)
{
    txtBoxToChange.BackColor = Color.White;
    txtBoxToChange.ForeColor = Color.Black;
    txtBoxToChange.ReadOnly = false;
}

private void btnNormal_Click(object sender, EventArgs e)
{
    setTextBoxNormal(textBox1);
}

private void btnSetReadOnly_Click(object sender, EventArgs e)
{
    setTextBoxReadOnly(textBox1);
}


Alternatively, use this reusable static method.

C#
private static void ChangeReadOnlyTextBoxColor (
            TextBox ptxtChangeThis ,
            Color pclrNewForeColor )
        {
            Color clrBackColorOriginal = ptxtChangeThis.BackColor;
            ptxtChangeThis.BackColor = Color.Black;
            Application.DoEvents ( );
            ptxtChangeThis.BackColor = clrBackColorOriginal;
            Application.DoEvents ( );
            ptxtChangeThis.ForeColor = pclrNewForeColor;
            Application.DoEvents ( );
        }   // ChangeReadOnlyTextBoxColor
   
v3
You might try setting your Textbox enabled to false instead. You can still cange things how you want.
   

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