WPF开发时光之痕日记本（二）—— MVVM基类

当我们用MVVM的时候要实现INotifyPropertyChanged,每次都要实现这个接口比较麻烦，所以基类的作用就体现出来了。代码如下：

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public class ViewModelBase : INotifyPropertyChanged, IDisposable {     public event PropertyChangedEventHandler PropertyChanged;     public bool IsInDesignMode;     /// <summary> 显示名称 </summary>      public virtual string DisplayName { get; protected set; }       #region 构造       public ViewModelBase()     {       }     #endregion       private void OnPropertyChanged(string propertyName)     {         if (this.PropertyChanged != null)         {             this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));         }     }     private static string GetProperyName(string methodName)     {         if (methodName.StartsWith("get_") || methodName.StartsWith("set_") ||             methodName.StartsWith("put_"))         {             return methodName.Substring(4);         }         throw new Exception(methodName + " not a method of Property");     }       protected void SetProperty<T>(ref T name, T value)     {         if (object.Equals(name, value)) return;         name = value;         string propertyName = GetProperyName(new System.Diagnostics.StackTrace(true).GetFrame(1).GetMethod().Name);         this.OnPropertyChanged(propertyName);     }       #region IDisposable Members     public void Dispose()     {         this.OnDispose();     }     /// <summary>      /// 若支持IDisposable，请重写此方法，当被调用Dispose时会执行此方法。      /// </summary>      protected virtual void OnDispose()     {     }     #endregion } public class CommandBase : System.Windows.Input.ICommand {     private Action<Object> _doWork;     private readonly Func<object, bool> _canExecute;       /// <summary>      /// 实例化一个CommandBase对象      /// </summary>      /// <param name="doWork">委托一个有object类型参数的命令执行函数</param>      /// <param name="canExecute">委托一个有object类型参数的命令是否能被执行的函数（可选）</param>      /// <exception cref="ArgumentNullException">参数command不可以为null引用</exception>      public CommandBase(Action<object> doWork, Func<object, bool> canExecute = null)     {         if (doWork == null)             throw new ArgumentNullException("doWork");           _canExecute = canExecute;         _doWork = doWork;     }     public bool CanExecute(Object parameter)     {         return true;     }     public void Execute(Object parameter)     {         if (this._doWork != null)             this._doWork(parameter);     }     public event EventHandler CanExecuteChanged     {         add { }         remove { }     } }

　　使用方式如下，例：

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public class TestViewModel : ViewModelBase    {        public TestViewModel()        {            this.LoadCommand = new CommandBase((Object parameter) => Loading());        }        #region 属性                 private string _name;          /// <summary> 是否可用 </summary>        public string IsEnable        {            get { return _name; }            set            {                base.SetProperty<string>(ref this._name, value);            }        }        #endregion          #region 命令          /// <summary>        /// 窗口加载命令        /// </summary>        public ICommand LoadCommand { get; set; }        #endregion          #region 方法          /// <summary>        /// 初始化方法        /// </summary>        public void Loading()        {          }        #endregion    }

　　看了例子后，是不是感觉很简单呢？详细的测试代码会再后续的文章中提供给大家参考。