WPF MVVM INotifyPropertyChanged

最新推荐文章于 2025-04-10 13:37:38 发布

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最新推荐文章于 2025-04-10 13:37:38 发布

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文章标签： windows c#

本文链接：https://blog.youkuaiyun.com/u010549750/article/details/105244665

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本文详细介绍WPF MVVM(Model-View-ViewModel)模式的应用，包括界面属性绑定、INotifyPropertyChanged刷新机制，以及通过实例演示如何使用UserControl和ViewModelBase类实现数据与视图的双向绑定。

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本文介绍 wpf MVVM(Model-View- ViewModel ) 模式，以及界面绑定属性， INotifyPropertyChanged的刷新功能，附加知识点类的继承，UserControl的使用。

使用开发工具 vs2019

1.创建wpf项目

2.项目名称 MvvmDemo

3.创建UserControl

在PersonUserControl中加入控件

1>xaml文件

2> .cs文件

using System;
using System.Collections.Generic;
using System.Text;
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 MvvmDemo
{
/// <summary>
/// PersonUserControl.xaml 的交互逻辑
/// </summary>
public partial class PersonUserControl : UserControl
{
private PersonViewModel m_personViewModel;
public PersonUserControl()
{
InitializeComponent();
m_personViewModel = base.DataContext as PersonViewModel;
}

private void UpdateBtn_Click(object sender, RoutedEventArgs e)
{
try
{
m_personViewModel.Name = "李四";
m_personViewModel.Age = 25;
}
catch(Exception error)
{
Console.WriteLine(error.Message);
}
}
}
}

4.添加Person类

using System;
using System.Collections.Generic;
using System.Text;

namespace MvvmDemo
{
class Person
{
private string m_name;
private int m_age;
public string Name
{
get
{
return m_name;
}
set
{
m_name = value;
}
}
public int Age
{
get
{
return m_age;
}
set
{
m_age = value;
}
}
}
}

5. 添加ViewModelBase类继承INotifyPropertyChanged，实现刷新功能

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Text;

namespace MvvmDemo
{
class ViewModelBase:INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;

public void NotifyPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}

6.添加 PersonViewModel类继承ViewModelBase

using System;
using System.Collections.Generic;
using System.Text;

namespace MvvmDemo
{
class PersonViewModel:ViewModelBase
{
private Person m_person;
public PersonViewModel ()
{
m_person = new Person() { Name = "张三",Age=12};
}
public String Name
{
get
{
return m_person.Name;
}
set
{
m_person.Name = value;
NotifyPropertyChanged("Name"); //监测Name是否变化
}
}
public int Age
{
get
{
return m_person.Age;
}
set
{
m_person.Age = value;
NotifyPropertyChanged("Age") ; //监测Age是否变化
}
}
}
}

7.将PersonUserControl 添加到MainWindow.xaml