Page History: Converting Between Hex and Integer

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Page Revision: Fri, Oct 09, 2009, 1:21 PM

The following C# code demonstrates how to convert a hexadecimal color value to its three decimal components. The key to the conversion is the Convert.ToInt32(s, 16) function call. (The second parameter is the base to convert from.)

private void ConvertToRgb()
{
    try
    {
        string hex = "000000" + uxHexTextBox.Text ;
        hex = hex.Substring(hex.Length - 6, 6);
        string result = "RGB(";

        for (int i = 0; i <= 4; i += 2)
        {
            string s = hex.Substring(i, 2);
            result += Convert.ToInt32(s, 16).ToString();
            if (i < 4)
                result += ", ";
        }
        result += ")";
        uxRgbTextBox.Text = result;
        Clipboard.SetText(result);
        uxHexTextBox.SelectAll();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, Application.ProductName);
    }
}