January 9, 2019 11:35 by
PeterData binding is one of the coolest gimmicks that have ever existed in Silverlight. Binding a UI Element's property with a property in the code behind, has the ability to do any sort of trap. It's wizardry, basically. Once the properties are bound, we have to continue telling the UI if the property's estimation has been adjusted in the code. INotifyPropertyChanged is helpful for this.
You see, since it is an interface, we have to first actualize it. The procedure is not exceptionally extreme however. In the new Silverlight project, here is the code of my main page:
publicpartialclassMainPage : UserControl
{
privatestring _names;
publicstring Names
{
get
{
return _names;
}
set
{
_names = value;
}
}
public MainPage()
{
InitializeComponent();
}
privatevoid MainPage_OnLoaded(object sender, RoutedEventArgs e)
{
Names = "This is the Text";
}
}
The property "Name" I have here is bound with the textblock in XAML. Now write the following code:
<UserControlx:Class="PropertyChangedDescribed.MainPage"
xmlns=http://schemas.microsoft.com/winfx/2006/xaml/presentation
xmlns:x=http://schemas.microsoft.com/winfx/2006/xaml
xmlns:d=http://schemas.microsoft.com/expression/blend/2008
xmlns:mc=http://schemas.openxmlformats.org/markup-compatibility/2006
mc:Ignorable="d"
Loaded="MainPage_OnLoaded"
x:Name="TestingPropertyChanged"
d:DesignHeight="300"d:DesignWidth="400">
<Gridx:Name="LayoutRoot"Background="White">
<TextBlockText="{Binding Names, ElementName=TestingPropertyChanged}"/>
</Grid>
</UserControl>
As should be obvious, the textblock has its "text" property bound with our code behind's property "Name". At this moment, regardless of what you set the estimation of "Name", it will never be reflected onto the UI. Thus, what we need is, each time we change the estimation of our property "Name," the content piece has its esteem changed as well. To do this, we have to actualize the interface INotifyPropertyChanged. Here is the changed primary page's code to do as such:
publicpartialclassMainPage : UserControl, INotifyPropertyChanged
{
privatestring _names;
publicstring Names
{
get
{
return _names;
}
set
{
_names = value;
OnPropertyChanged("Names");
}
}
public MainPage()
{
InitializeComponent();
}
privatevoid MainPage_OnLoaded(object sender, RoutedEventArgs e)
{
Names = "This is the Text";
}
publicevent PropertyChangedEventHandler PropertyChanged;
privatevoid OnPropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
{
PropertyChanged(this,new PropertyChangedEventArgs(propertyName));
}
}
}
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