WPF中的数据绑定1——使用依赖属性

MVVM学习中，数据绑定的三种方法：

1、依赖属性

2、属性名+Changed事件

3、INotifyPropertyChanged接口

这里先介绍第一种方法，使用依赖属性进行数据绑定。

Model层：创建一个InfoModel类；

View Model层：创建一个MainViewModel类；

View层：使用MainWindow窗体；

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.ComponentModel;

namespace MVVMStudy.Model
{
    public  class InfoModel:DependencyObject
    {
        public string DPName
        {
            get { return (string)GetValue(DPNameProperty); }
            set { SetValue(DPNameProperty, value); }
        }

        // Using a DependencyProperty as the backing store for DPName.  This enables animation, styling, binding, etc...
        public static readonly System.Windows.DependencyProperty DPNameProperty =
            DependencyProperty.Register("DPName", typeof(string), typeof(InfoModel), new PropertyMetadata(default(string)));

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MVVMStudy.Model;

namespace MVVMStudy.ViewModel
{
    public  class MainViewModel
    {
        
        public InfoModel InfoModel { get; set; }

        public MainViewModel()
        {
            InfoModel = new InfoModel { DPName = "数据绑定" };
        }
    }
}

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;
using MVVMStudy.ViewModel;

namespace MVVMStudy
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {

        MainViewModel model = new MainViewModel();
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = model;
            
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            //this.model.InfoModel.DPName = "change data";
            MessageBox.Show(this.model.InfoModel.DPName);
        }
    }
}

<Window x:Class="MVVMStudy.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:MVVMStudy"
        xmlns:vm="clr-namespace:MVVMStudy.ViewModel"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="400">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <StackPanel>
            <TextBox Text="{Binding InfoModel.DPName,UpdateSourceTrigger=PropertyChanged ,Mode=TwoWay}" FontSize="20"/>
            <TextBox Text="" FontSize="20"/>
            <Button Content="button" Click="Button_Click"/>
        </StackPanel>
    </Grid>
</Window>

技术总结：

1、InfoModel必须继承DependencyObject，必须引用using System.Windows;