C#的动态对象的属性实现比较简单，如果要实现动态语言那种动态方法就比较困难，因为对于dynamic对象，扩展方法,匿名方法都是不能用直接的，这里还是利用对象和委托来模拟这种动态方法的实现，看起来有点javascript的对象味道：
1) 定义一个委托，参数个数可变，参数都是object类型：这里的委托多有个dynamic参数，代表调用这个委托的动态对象本身。
public delegate object MyDelegate(dynamic Sender, params object[] PMs);
2) 定义一个委托转载对象，因为dynamic对象不能直接用匿名方法，这里用对象去承载：
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);
}
}
3) 定义一个动态对象：
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);
}
}
