从类从DynamicObject继承继承
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19-09-2019 - |
题
我用C#4.0的动态对象模型试验。
我创建名为“块”,从DynamicObject继承抽象类。它覆盖TryGetMember和TrySetMember。
此外我已经创建了一个名为“刷”可用类,从“块”继承。我希望它是可用的动态。
但是,当我从它创建一个动态的对象,并试图访问一个运行时绑定的成员,它的皮毛我的异常告诉我,成员不存在。父类的抽象的重写TryGetMember或TrySetMember方法并不获取调用。
是可以预料的这种行为?
谢谢!
解决方案
您还没有发布任何代码,因此它很难说,但这里是肯定工作的样品。它的东西,我今天读的修改版本。希望它帮助
namespace DynamicStuff
{
public class Program
{
static void Main(string[] args)
{
dynamic brush = new Brush();
brush.Handle = "Wooden";
brush.Colour = "Red";
Console.WriteLine(brush.Handle + " " + brush.Colour);
Console.WriteLine(
"Number of dynamic properties:" + brush.Count);
}
}
public class Brush : Block
{
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
Console.Out.WriteLine("About To call TryGetMember base");
object res = null;
bool retVal = base.TryGetMember(binder, out res);
result = res;
return retVal;
}
public override bool TrySetMember(System.Dynamic.SetMemberBinder binder, object value)
{
Console.Out.WriteLine("About to call TrySetMember base");
return base.TrySetMember(binder, value);
}
}
public abstract class Block : DynamicObject
{
private Dictionary<string, object> d = new Dictionary<string, object>();
public int Count
{
get
{
return d.Count;
}
}
public override bool TryGetMember(
GetMemberBinder binder, out object result)
{
Console.Out.WriteLine("In TryGetMember in block");
string name = binder.Name.ToLower();
return d.TryGetValue(name, out result);
}
public override bool TrySetMember(
SetMemberBinder binder, object value)
{
Console.Out.WriteLine("In TrySetMember in block");
d[binder.Name.ToLower()] = value;
return true;
}
}
}
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