我正在尝试做一个简单的绑定,但我遇到了一些问题。我有一个文本块和一个按钮。文本块绑定到名为“word”的属性。当您按下按钮时,单词的值会发生变化,我想自动更新文本块。这是一个典型的例子,请解释一下我做错了什么:
namespace WpfApplication5
{
public partial class MainWindow : Window, INotifyPropertyChanged
{
private string _word;
public string word
{
get { return _word; }
set
{
_word= value;
RaisePropertyChanged(word);
}
}
private void change_Click(object sender, RoutedEventArgs e)
{
word= "I've changed!";
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
#endregion
}
}
我的XAML带有绑定:
<Window x:Class="WpfApplication5.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<TextBlock HorizontalAlignment="Left" Margin="210,152,0,0" TextWrapping="Wrap" Text="{Binding word}" VerticalAlignment="Top"/>
<Button x:Name="change" Content="Change" HorizontalAlignment="Left" Margin="189,235,0,0" VerticalAlignment="Top" Width="75" Click="change_Click"/>
</Grid>
</Window>
答案 0 :(得分:2)
您正在为名为PropertyChanged
的媒体资源举办I've changed!
个活动,因为您已将属性word
的值传递给RaisePropertyChanged
。您需要传递属性的名称:
RaisePropertyChanged("word");
此答案假定数据上下文设置正确。如果没有,你也需要解决这个问题:
DataContext = this;