閱讀導航

常用類屬性設置、獲取方式

二次封裝 INotifyPropertyChanged

Demo 展示、源碼下載

1. 常用類屬性設置、獲取方式

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 }

這種方式總感覺有點啰嗦，如果 Name 屬性名修改，字符串 "Name" 還要手動修改，就算 Ctrl+H 替換也容易出錯，如果使用下面這種方式，是不是感覺更清爽一點？

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

2. 二次封裝INotifyPropertyChanged

封裝的基類PropertyNotifyObject出處我忘了，15年網上找的，源碼如下：

using System; using System.Collections.Generic; using System.ComponentModel; using System.Linq.Expressions; using System.Windows; using System.Windows.Threading;namespace MVVMTest {#region 封裝WPF屬性public class MyCommMetoh{//得到屬性的名稱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("發送UI屬性變化事件異常,屬性名稱: {0}, 異常詳細信息: {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 根據屬性名得到屬性值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、源碼下載

源碼下載：MVVMTest

展示效果：

除非注明，文章均由?Dotnet9?整理發布，歡迎轉載。
轉載請注明本文地址：https://dotnet9.com/8572.html

---

時間如流水，只能流去不流回！

這段時間在家，除了睡覺，也不要忘了學習。

總結

以上是生活随笔為你收集整理的简化MVVM属性设置和修改 - .NET CORE(C#) WPF开发的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。