How "XamlReader.Load" handles event attributes declared in XAML?

06-15-2009 5:23 AM |

I am working on Silverlight 3beta. 

Is "XamlReader.Load" handles event attributes declared in XAML?

I came across this article at (Option3a on the page) http://blogs.windowsclient.net/rob_relyea/archive/2009/06/03/xaml-events-in-compiled-and-uncompiled-scenarios.aspx

But, it's possibility with the working is not provided. Do any one let me know on this??

I want to display XAML content on the user control dynamically, I achieved this with the help of XamlReader. But, I want to handle the events inside the XAML in the usercontrols code file.

XAML content:

<Button x:Name="OK" Click="Button_Click" ..... />

I want to handle Button_Click event in the usercontrol's code file.

please let me know on this?

Re: How "XamlReader.Load" handles event attributes declared in XAML?

06-15-2009 1:33 PM |

You can not set the event handler in markup if you are loading your XAML via the XamlReader.

Re: How "XamlReader.Load" handles event attributes declared in XAML?

06-18-2009 11:58 PM |

one way to handle event is attach eventhandler in code.

            var ele1 = XamlReader.Load(xamlstring) as FrameworkElement;
            var btn1 = ele1.FindName("OK") as Button;
            btn1.Click+=new RoutedEventHandler(btn1_Click);

Re: Re: How "XamlReader.Load" handles event attributes declared in XAML?

07-21-2009 12:15 AM |

Hi,Ashok

I met the same problem just like you described, Could you supply some sample code about how to get the event using VisualTreeHelper please?

Thanks

Re: Re: How "XamlReader.Load" handles event attributes declared in XAML?

07-22-2009 5:58 AM |

Hello Spiderman,

Find the attached code. In this, stream is xaml file as a stream

            System.IO.StreamReader reader = new System.IO.StreamReader(stream); // System.IO.Stream stream
            string str = reader.ReadToEnd();
            MessageBox.Show(str);          
            UserControl ctrl = (UserControl)System.Windows.Markup.XamlReader.Load(str);
                       
            #region Visual Tree Helper

            FrameworkElement parentt = (FrameworkElement)VisualTreeHelper.GetChild(ctrl, 0);
            int count = VisualTreeHelper.GetChildrenCount(parentt);
            for (int i = 0; i < count; i++)
            {
                FrameworkElement c = (FrameworkElement)VisualTreeHelper.GetChild(parentt, i);
                if (c is Button)
                {
                    Button b = c as Button;
                    b.Click += new RoutedEventHandler(Button_Click);
                }
                else if (c is TextBox)
                {
                    TextBox txt = c as TextBox;
                    txt.TextChanged += new TextChangedEventHandler(txt_TextChanged);
                }
            }
            #endregion

            //btn.Click += new RoutedEventHandler(Button_Click);
            if (ctrl == null)
                MessageBox.Show("ctrl is null");

            if ((LayoutRoot != null) && (ctrl != null))
                LayoutRoot.Children.Add(ctrl);

 Regards

Ashok