利用C#特性优化AMF反序列化类

public delegate T AmfReadType<out T>(AMF0Reader instance,bool withType = false);

private static readonly Dictionary<byte, Delegate> ReadMap = new Dictionary<byte, Delegate>();

static AMF0Reader()
{
var type = typeof(AMF0Reader);
var amfReadTypeOf = typeof(AmfReadType<>);
foreach (var method in type.GetMethods())
{
var attribute = method.GetCustomAttribute<AmfReadTypeAttribute>();
if (attribute == null) continue;
ReadMap[attribute.Type] = Delegate.CreateDelegate(amfReadTypeOf.MakeGenericType(method.ReturnType), method);
}
}

public T Read<T>() => ((AmfReadType<T>)ReadMap[ReadByte()])(this);