
Silverlight Beta2中,没有提供密码输入框控件,估计在正式版里应该提供吧。Chris PIEtschmann自己写了一个,原文地址是:
http://pietschsoft.com/post/2008/03/PasswordTextBox-for-Silverlight-2-Beta-1.aspx
创建一个PasswordTextBox.cs类,代码如下:
/// copyright 2008 Chris PIEtschmann ( http://pIEtschsoft.com )/// This work is licensed under a Creative Commons Attribution 3.0 United States license
/// http://creativecommons.org/licenses/by/3.0/us/
///
/// This is a Password TextBox built for use with Silverlight 2 Beta 1
/// The reason this was built, is because the standard TextBox in
/// Silverlight 2 Beta 1 does not have Password support.
/// Original link: http://pIEtschsoft.com/post/2008/03/PasswordTextBox-for-Silverlight-2-Beta-1.aspx
///
using System.windows.Controls;
namespace SilverlightPasswordTextBox
{
public partial class PasswordTextBox : TextBox
{
public PasswordTextBox()
{
this .TextChanged += new TextChangedEventHandler(PasswordTextBox_TextChanged);
this .KeyDown += new System.windows.input.KeyEventHandler(PasswordTextBox_KeyDown);
}
#region Event Handlers
public voID PasswordTextBox_TextChanged( object sender, TextChangedEventArgs e)
{
if ( base .Text.Length >= _Text.Length)
_Text += base .Text.Substring(_Text.Length);
displayMaskedCharacters();
}
public voID PasswordTextBox_KeyDown( object sender, System.windows.input.KeyEventArgs e)
{
int cursorposition = this .SelectionStart;
int selectionLength = this .SelectionLength;
// Handle Delete and Backspace Keys Appropriately
if (e.Key == System.windows.input.Key.Back
|| e.Key == System.windows.input.Key.Delete)
{
if (cursorposition < _Text.Length)
_Text = _Text.Remove(cursorposition, (selectionLength > 0 ? selectionLength : 1 ));
}
base .Text = _Text;
this .Select((cursorposition > _Text.Length ? _Text.Length : cursorposition), 0 );
displayMaskedCharacters();
}
#endregion
#region Private Methods
private voID displayMaskedCharacters()
{
int cursorposition = this .SelectionStart;
// This changes the Text property of the base TextBox class to display all Asterisks in the control
base .Text = new string (_PasswordChar, _Text.Length);
this .Select((cursorposition > _Text.Length ? _Text.Length : cursorposition), 0 );
}
#endregion
#region PropertIEs
private string _Text = string .Empty;
/// <summary>
/// The text associated with the control.
/// </summary>
public new string Text
{
get { return _Text; }
set
{
_Text = value;
displayMaskedCharacters();
}
}
private char _PasswordChar = ' * ' ;
/// <summary>
/// Indicates the character to display for password input.
/// </summary>
public char PasswordChar
{
get { return _PasswordChar; }
set { _PasswordChar = value; }
}
#endregion
}
}
使用方法:
< UserControl x:Class ="SilverlightApplication1.Page"xmlns ="http://schemas.microsoft.com/clIEnt/2007"
xmlns:x ="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:myctl ="clr-namespace:SilverlightApplication1;assembly=SilverlightApplication1" WIDth ="600" Height ="480" >
< GrID x:name ="LayoutRoot" Background ="White" >
< Canvas Canvas.top ="20" >
< myctl:PasswordTextBox x:name ="UserPassword" WIDth ="200" Height ="30" Canvas.top ="40" Canvas.left ="20" ></ myctl:PasswordTextBox >
</ Canvas >
</ GrID >
</ UserControl >
注意:要先加入名称空间,具体的值是:
clr-namespace:名称空间全名;assembly=程序集名称
通过使用,发现两个问题:
1,<myctl:PasswordTextBox PasswordChar="" />设置会报错
2,Text="初始值"仍旧是明文
原帖地址:http://blog.csdn.net/net_lover/archive/2008/04/06/2254267.aspx 感谢孟宪会老师
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