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" 
XMLNS: local="CLR namespace: CefTest" 
MC: Ignorable="d" 
Title="MainWindow" Height="450" Width="800" & gt; 
 
 
 
 
 
 

 
Public class TestM: INotifyPropertyChanged 
{
Private string _tes="123123123123"; 

Public TestM () {} 

Public string TextStr 
{
The get=& gt; _tes; 
Set 
{
If (_tes!=value) 
{
_tes=value; 
RaisePropertyChanged (); 
} 
} 
} 


The public event PropertyChangedEventHandler PropertyChanged; 

Protected void RaisePropertyChanged ([CallerMemberName] string propertyName=null) 
{
PropertyChanged? Invoke (this, new PropertyChangedEventArgs (propertyName)); 
} 
}