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Introduction

While digging into Silverlight 2 Beta 2 I have noticed that there is no Password Box available. It will be in a finall version but till then we have to figure out some other way to do it. This solution is quick and maybe even a little bit dirty but it works what makes it valuable enough to be posted :)

Using the code

Just attach the tbPassword_TextChanged method (from the attached example) to your password text box (simple Silverlight Text Box).

          
string _currentText = "";

void tbPassword_TextChanged(object sender, TextChangedEventArgs e)

{

    TextBox __textBox = sender as TextBox;

    if (__textBox != null)

    {

        string __currentText = __textBox.Text;

        if (__currentText.Length < _currentText.Length)

            _currentText = _currentText.Substring(0, __currentText.Length);

        if (__currentText != "")

        {

            for (int i = 0; i < __currentText.Length; i++)

            {

                if (__currentText[i] != '\u25CF')

                {
            
                    string __temp = __currentText.Remove(i, 1);

                    __textBox.Text = __temp.Insert(i, "\u25CF");

                    _currentText = _currentText.Insert(_currentText.Length, __currentText[i].ToString());

 

                }

            }

        }

    }

}

In the _currentText you will find text from the password box.

Points of Interest

I am working on quite big RIA Silverlight application. Lacking this basic password box made my stomach aches. Hopefully in final release of Silverlight we wont have such issues anymore.

History

While creating this small sample I was inspired by Michael Sync post. Unfortunatly, Silverlight 2 beta 2 sample source code did not work properly that is why I decided to write simplier solution (IMHO).

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Maciej Gren

I started work with .Net in year 2005. During my studies I was a team leader of project which scored 4th place on Polish Imagine Cup Finals where we delivered WPF application with https WCF services. Meanwhile I have worked on Windows Mobile Applications with Windows CE 5.0. I have learned how to create Windows CE Images using Platform Builder and I gained high skills in Compact Framework 2.0. After one year of developing using this framework I have switched to ASP.Net. Currently I am using Monorail Framework together with Active Record and Extjs library (for presentation layer). I am a Team Leader in GOYELLO where we delivered quite successful projects. My aim is to develop good quality applications but not forgetting about reality. Always there are some drawbacks on each solution. The case is to find the proper balance Smile

Occupation:	Team Leader
Company:	GOYELLO
Location:	Poland

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Some changes for given code [modified]

introsas

8:24 19 Sep '08

Here is my updated code


public class PasswordBox : TextBox
{
    #region Private Member Variables

    private string _text = string.Empty;
    private char _passwordChar = '\u25CF';

    #endregion

    #region Constructor

    /// <summary>
    /// Default Class Constructor
    /// </summary>
    public PasswordBox()
    {
        this.TextChanged += new TextChangedEventHandler(TextBox_TextChanged);
    }


    #endregion


    #region Private Methods


    private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
    {
        TextBox myTxtBox = sender as TextBox;

        if (myTxtBox != null)
        {
            string currentText = myTxtBox.Text;
            int selStart = myTxtBox.SelectionStart;

            if (currentText.Length < _text.Length)
            {
                // Remove deleted chars
                _text = _text.Remove(selStart, _text.Length - currentText.Length);
            }
            if (currentText != "")
            {
                for (int i = 0; i < currentText.Length; i++)
                {
                    if (currentText[i] != _passwordChar)
                    {
                        // Unattach event handler
                        myTxtBox.TextChanged -= new TextChangedEventHandler(TextBox_TextChanged);
                        myTxtBox.Text = myTxtBox.Text.Remove(i, 1).Insert(i, _passwordChar.ToString());
                        myTxtBox.TextChanged += new TextChangedEventHandler(TextBox_TextChanged);
                        // Replace or insert char
                        _text = myTxtBox.Text.Length == _text.Length ?
                                _text.Remove(i, 1).Insert(i, currentText[i].ToString()) :
                                _text.Insert(i, currentText[i].ToString());
                    }
                }
            }
            myTxtBox.SelectionStart = selStart;
        }
    }

    #endregion
    #region Properties

    public new string Text
    {
        get { return _text; }
    }

    #endregion
}