C#MVVM架构 简单实例可以运行
**C# MVVM架构简介**
MVVM（Model-View-ViewModel）是一种软件设计模式，尤其在开发WPF、UWP和Xamarin等基于.NET Framework的桌面应用或移动应用时广泛应用。该模式源自经典的MVC（Model-View-Controller）模式，但更侧重于解耦视图（View）和业务逻辑（Controller）。
在C# MVVM架构中，有三个核心组件：
1. **Model（模型）**：这部分主要负责业务逻辑和数据处理，与数据库或其他数据源交互，封装了应用程序的数据模型。
2. **View（视图）**：视图是用户界面，直接与用户交互的部分，它通常由UI元素如按钮、文本框、窗口等组成。在C#中，这可能是XAML文件，用于定义界面布局和外观。
3. **ViewModel（视图模型）**：视图模型作为模型和视图之间的桥梁，它包含了业务逻辑并提供了数据绑定到视图的属性和命令。ViewModel还实现了INotifyPropertyChanged接口，当属性值改变时，可以通知视图进行更新。
**简单实例**
一个简单的C# MVVM应用可能包含以下部分：
- **Model类**：例如，一个名为`Person`的类，包含`Name`和`Age`属性，可能还有获取或设置这些属性的方法。
```csharp
public class Person
{
public string Name { get; set; }
public int Age { get; set; }
}
```
- **ViewModel类**：如`MainViewModel`，它公开`Person`对象的属性，并可能包含操作`Person`的命令。
```csharp
public class MainViewModel : INotifyPropertyChanged
{
private Person _person;
public Person Person
{
get => _person;
set
{
if (_person != value)
{
_person = value;
OnPropertyChanged(nameof(Person));
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
// 命令示例
public RelayCommand SaveCommand { get; }
private void OnSaveExecute()
{
// 保存Person数据到数据库或执行其他业务逻辑
}
}
```
- **View**：在WPF中，XAML文件定义了用户界面，并将控件绑定到ViewModel的属性。
```xml
```
**MVVM的优势**
- **解耦**：MVVM模式将视图、视图模型和模型分离，使得各自可以独立开发和测试，提高了代码的可维护性和复用性。
- **数据绑定**：通过数据绑定，视图模型可以直接驱动视图的更新，反之亦然，降低了视图和逻辑间的耦合。
- **测试友好**：由于视图模型不依赖于具体的视图，因此可以更容易地编写单元测试。
- **扩展性**：MVVM允许添加额外的ViewModel以支持新的功能，而不会影响现有代码。
在“C# MVVM架构 简单实例可以运行”的项目中，你将找到一个运行中的MVVM应用实例，包括上述的Model、ViewModel和View组件。通过分析这个项目，你可以深入理解MVVM架构的工作原理，并学习如何在实际项目中应用这一模式。
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