我正在尝试为WPF绑定创建一个模板,这样我就可以在将来需要使用绑定时从中提取代码。目前,绑定无论如何都不起作用。
我希望这段代码可以显示" MyString"和#34; MyInt"在UI的文本框中,并在用户更改值时正确地更改逻辑(因此检查按钮)。
但是,MyString和MyInt没有显示在文本框中,更改它们实际上也不会更改变量的值。
MainWindow.xaml.cs:
using System.Windows;
namespace WpfBindingTemplate
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.DataContext = this;
myController = new Controller();
}
Controller myController;
private void check_string(object sender, RoutedEventArgs e)
{
MessageBox.Show("MyString: " + myController.MyString);
}
private void check_int(object sender, RoutedEventArgs e)
{
MessageBox.Show("MyInt: " + myController.MyInt);
}
}
}
MainWindow.xaml:
<Window x:Class="WpfBindingTemplate.MainWindow"
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:WpfBindingTemplate"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Grid>
<TextBox Name="myTextBox" Text="{Binding Path=myController.MyString}" HorizontalAlignment="Left" Height="23" Margin="202,136,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120"/>
<Label x:Name="label" Content="String binding:" HorizontalAlignment="Left" Margin="77,133,0,0" VerticalAlignment="Top" Width="104"/>
<Button x:Name="button" Content="string check" Click="check_string" HorizontalAlignment="Left" Margin="370,136,0,0" VerticalAlignment="Top" Width="75"/>
<Label x:Name="label1" Content="int binding:" HorizontalAlignment="Left" Margin="77,188,0,0" VerticalAlignment="Top" Width="94"/>
<TextBox x:Name="textBox" Text="{Binding Path=myController.MyInt}" HorizontalAlignment="Left" Height="23" Margin="202,190,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120"/>
<Button x:Name="button1" Click="check_int" Content="int check" HorizontalAlignment="Left" Margin="370,188,0,0" VerticalAlignment="Top" Width="75"/>
</Grid>
</Window>
控制器类:
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
namespace WpfBindingTemplate
{
public class Controller : INotifyPropertyChanged
{
public Controller()
{
MyString = "test string";
MyInt = 1;
}
public int MyInt { get; set; }
private string myString;
public string MyString { get { return myString; } set { SetProperty(ref myString, value); } }
public event PropertyChangedEventHandler PropertyChanged;
private void SetProperty<T>(ref T field, T value, [CallerMemberName] string name = "")
{
if (!EqualityComparer<T>.Default.Equals(field, value))
{
field = value;
var handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
}
}
}
答案 0 :(得分:3)
对于初学者来说,绑定对字段不起作用,你需要在“Controller myController”上设置get / set;它也需要公开(在某些情况下,它也适用于内部)。