C#动态对象(dynamic)详解(实现方法和属性的动态)

public delegate object MyDelegate(dynamic Sender, params object[] PMs);

public class DelegateObj  {    private MyDelegate _delegate;    public MyDelegate CallMethod    {      get { return _delegate; }    }    private DelegateObj(MyDelegate D)    {      _delegate = D;    }    /// <summary>    /// 构造委托对象，让它看起来有点javascript定义的味道.    /// </summary>    /// <param name="D"></param>    /// <returns></returns>    public static DelegateObj Function(MyDelegate D)    {      return new DelegateObj(D);    }  }

public class DynObj : DynamicObject  {    //保存对象动态定义的属性值    private Dictionary<string, object> _values;    public DynObj()    {      _values = new Dictionary<string, object>();    }    /// <summary>    /// 获取属性值    /// </summary>    /// <param name="propertyName"></param>    /// <returns></returns>    public object GetPropertyValue(string propertyName)    {      if (_values.ContainsKey(propertyName) == true)      {        return _values[propertyName];      }      return null;    }    /// <summary>    /// 设置属性值    /// </summary>    /// <param name="propertyName"></param>    /// <param name="value"></param>    public void SetPropertyValue(string propertyName,object value)    {      if (_values.ContainsKey(propertyName) == true)      {        _values[propertyName] = value;      }      else      {        _values.Add(propertyName, value);      }    }    /// <summary>    /// 实现动态对象属性成员访问的方法，得到返回指定属性的值    /// </summary>    /// <param name="binder"></param>    /// <param name="result"></param>    /// <returns></returns>    public override bool TryGetMember(GetMemberBinder binder, out object result)    {      result = GetPropertyValue(binder.Name);      return result == null ? false : true;    }    /// <summary>    /// 实现动态对象属性值设置的方法。    /// </summary>    /// <param name="binder"></param>    /// <param name="value"></param>    /// <returns></returns>    public override bool TrySetMember(SetMemberBinder binder, object value)    {      SetPropertyValue(binder.Name, value);      return true;    }    /// <summary>    /// 动态对象动态方法调用时执行的实际代码    /// </summary>    /// <param name="binder"></param>    /// <param name="args"></param>    /// <param name="result"></param>    /// <returns></returns>    public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)    {      var theDelegateObj = GetPropertyValue(binder.Name) as DelegateObj;      if (theDelegateObj == null || theDelegateObj.CallMethod == null)      {        result = null;        return false;      }      result = theDelegateObj.CallMethod(this,args);      return true;    }    public override bool TryInvoke(InvokeBinder binder, object[] args, out object result)    {      return base.TryInvoke(binder, args, out result);    }  }

dynamic theObj = new DynObj();      theObj.aaa = "this is a test";//动态属性      //动态方法，这里不能没法定义参数，调用的时候可以是任意多参数，具体参数类型和含义就只能自己去小心处理了.      theObj.show = DelegateObj.Function((s, pms) =>      {        if (pms != null && pms.Length > 0)        {          MessageBox.Show(pms[0].ToString() + ":" + s.aaa);        }        else        {          MessageBox.Show(s.aaa);        }        return null;      }      );      theObj.show("hello");