WinForm雙向數據綁定:https://blog.csdn.net/weixin_42274148/article/details/104889310
參考:https://docs.microsoft.com/zh-cn/dotnet/framework/wpf/data/binding-declarations-overview
綁定的四個要素:
- 綁定目標對象。
- 目標屬性。
- 綁定源。
- 要使用的綁定源中值的路徑。
msdn上給了很多綁定的示例,下邊僅給出一種綁定的代碼實現:
1、工程結構;
2、xaml文件;
<Window x:Class="testBinding.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:testBinding"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800"
Loaded="Window_Loaded">
<Grid>
<Button x:Name="button" Content="Add" HorizontalAlignment="Left" Margin="340,109,0,0" VerticalAlignment="Top" Width="75" Click="button_Click"/>
<TextBox x:Name="textBox" Text="{Binding Sum}" HorizontalAlignment="Left" Height="23" Margin="149,109,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120"/>
</Grid>
</Window>
3、 Data.cs;
using System;
using System.Collections.Generic;
using System.ComponentModel; //添加命名空間
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace testBinding
{
class Data: INotifyPropertyChanged //.net定義的接口
{
private int sum;
public int Sum
{
get
{
return this.sum;
}
set
{
this.sum = value;
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs("Sum")); //觸發事件
}
}
}
public event PropertyChangedEventHandler PropertyChanged; //實現接口
}
}
4、後臺代碼;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace testBinding
{
/// <summary>
/// MainWindow.xaml 的交互邏輯
/// </summary>
public partial class MainWindow : Window
{
private Data myData = new Data();
//項目中可以把需要交互的數據放在一個單獨的類中,並將這個類與前端控件綁定,
//通常,需要在該類中實現INotifyPropertyChanged接口,纔可以實現雙向的綁定
public MainWindow()
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
myData.Sum = 0;
textBox.DataContext = myData; //綁定數據上下文
}
private void button_Click(object sender, RoutedEventArgs e) //測試代碼
{
myData.Sum++;
}
}
}
5、結尾
綁定的目的是實現前後端代碼的分離,如果不使用綁定,還可以通過直接給控件賦值,或者通過控件讀取值來實現。這樣會導致前後端代碼高度耦合,修改極度繁瑣;而通過以上方式,可以使前後端代碼的耦合被限定在Window_Loaded這個函數中,便於代碼的修改和移植;