wpf OnPropertyChanged 和 XAML
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OnPropertyChanged and XAML
提问by 3ka5_cat
I'm trying to specify data variable for my TextBlock at xaml:
我正在尝试在 xaml 中为我的 TextBlock 指定数据变量：
<TextBlock Name="Test11" Text="{Binding Path=Test}"></TextBlock>
I'm using OnPropertyChanged for it:
我正在使用 OnPropertyChanged：
public partial class MainWindow : Window, INotifyPropertyChanged
private string _test;
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
public string Test
{
get
{
return _test;
}
set
{
_test = value;
OnPropertyChanged("Test");
}
}
And trying to set value at MainWindow constructor:
并尝试在 MainWindow 构造函数中设置值：
public MainWindow()
{
InitializeComponent();
Test = "teeest";
}
But Textblock.Text wasn't updated... What I'm doing wrong?
但是 Textblock.Text 没有更新......我做错了什么？
回答by SynerCoder
You need to set the datacontext so the UI knows where to get the data for the binding.
您需要设置数据上下文，以便 UI 知道从何处获取绑定数据。
public MainWindow()
{
InitializeComponent();
this.DataContext = this;
Test = "teeest";
}
回答by Klaus78
In the Window constructor after
在 Window 构造函数之后
InitializeComponents()
初始化组件()
put
放
this.DataContext = this;
this.DataContext = this;
