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1. 常用类属性设置、获取方式

2. 二次封装 INotifyPropertyChanged

3. Demo 展示、源码下载

1. 常用类属性设置、获取方式

public class Student : INotifyPropertyChanged
{private string name;public string Name{get { return name; }set{if(name != value){name = value;OnPropertyChanged("Name")}}}#region INotifyPropertyChangedpublic event PropertyChangedEventHandler PropertyChanged;public void OnPropertyChanged(string propertyName){if (PropertyChanged != null){PropertyChanged(this, new PropertyChangedEventArgs(propertyName));}}#endregion
}

这种方式总感觉有点啰嗦，如果 Name 属性名修改，字符串 "Name" 还要手动修改，就算 Ctrl+H 替换也容易出错，如果使用下面这种方式，是不是感觉更清爽一点？

public class Student : PropertyNotifyObject
{public string Name    {get { return this.GetValue(cu => cu.Name); }set { this.SetValue(cu => cu.Name, value); }}
}

2. 二次封装INotifyPropertyChanged

封装的基类PropertyNotifyObject出处我忘了，15年网上找的，源码如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq.Expressions;
using System.Windows;
using System.Windows.Threading;namespace MVVMTest
{#region 封装WPF属性public class MyCommMetoh{//得到属性的名称public static string GetPropertyName<T, U>(Expression<Func<T, U>> exp){string _pName = "";if (exp.Body is MemberExpression){_pName = (exp.Body as MemberExpression).Member.Name;}else if (exp.Body is UnaryExpression){_pName = ((exp.Body as UnaryExpression).Operand as MemberExpression).Member.Name;}return _pName;}}public class NotifyPropertyBase : INotifyPropertyChanged{/// <summary>/// Returns a dispatcher for multi-threaded scenarios/// </summary>/// <returns></returns>public static Dispatcher GetDispatcher(DispatcherObject source = null){//use the application's dispatcher by defaultif (Application.Current != null) return Application.Current.Dispatcher;//fallback for WinForms environmentsif (source != null && source.Dispatcher != null) return source.Dispatcher;//ultimatively use the thread's dispatcherreturn Dispatcher.CurrentDispatcher;}#region INotifyPropertyChangedpublic void OnPropertyChanged(string propertyName){if (PropertyChanged != null){GetDispatcher().BeginInvoke((Action)delegate{try{PropertyChanged(this, new PropertyChangedEventArgs(propertyName));}catch (Exception ex){var msg = string.Format("发送UI属性变化事件异常,属性名称: {0}, 异常详细信息: {1}", propertyName, ex.ToString());}});}}public void OnPropertyChanged<T>(Expression<Func<T>> expression){if (PropertyChanged != null){var propertyName = ((MemberExpression)expression.Body).Member.Name;PropertyChanged(this, new PropertyChangedEventArgs(propertyName));}}public event PropertyChangedEventHandler PropertyChanged;#endregion}public static class NotifyPropertyBaseEx{public static void OnPropertyChanged<T, U>(this T npb, Expression<Func<T, U>> exp) where T : NotifyPropertyBase, new(){string _PropertyName = MyCommMetoh.GetPropertyName(exp);npb.OnPropertyChanged(_PropertyName);}}public class PropertyNotifyObject : NotifyPropertyBase, IDisposable{public PropertyNotifyObject(){}Dictionary<object, object> _ValueDictionary = new Dictionary<object, object>();#region 根据属性名得到属性值public T GetPropertyValue<T>(string propertyName){if (string.IsNullOrEmpty(propertyName)) throw new ArgumentException("invalid " + propertyName);object _propertyValue;if (!_ValueDictionary.TryGetValue(propertyName, out _propertyValue)){_propertyValue = default(T);_ValueDictionary.Add(propertyName, _propertyValue);}return (T)_propertyValue;}#endregionpublic void SetPropertyValue<T>(string propertyName, T value){if (!_ValueDictionary.ContainsKey(propertyName) || _ValueDictionary[propertyName] != (object)value){_ValueDictionary[propertyName] = value;OnPropertyChanged(propertyName);}}#region Disposepublic void Dispose(){DoDispose();}~PropertyNotifyObject(){DoDispose();}void DoDispose(){if (_ValueDictionary != null)_ValueDictionary.Clear();}#endregion}public static class PropertyNotifyObjectEx{public static U GetValue<T, U>(this T t, Expression<Func<T, U>> exp) where T : PropertyNotifyObject{string _pN = MyCommMetoh.GetPropertyName(exp);return t.GetPropertyValue<U>(_pN);}public static void SetValue<T, U>(this T t, Expression<Func<T, U>> exp, U value) where T : PropertyNotifyObject{string _pN = MyCommMetoh.GetPropertyName(exp);t.SetPropertyValue<U>(_pN, value);}}#endregion
}

3. Demo展示、源码下载

源码下载：MVVMTest

展示效果：

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