示例#1
0
        internal bool TryGetMemberValue(Type type, object obj, string name, out JsValue value)
        {
            object result;

            // dictionaries.
            if (typeof(IDictionary).IsAssignableFrom(type)) {
                IDictionary dictionary = (IDictionary)obj;
                if (dictionary.Contains(name)) {
                    result = dictionary[name];
                    value = _convert.ToJsValue(result);
                } else {
                    value = JsValue.Null;
                }
                return true;
            }

            BindingFlags flags;
            if (type == obj) {
                flags = BindingFlags.Public | BindingFlags.Static;
            } else {
                flags = BindingFlags.Public | BindingFlags.Instance;
            }

            // First of all try with a public property (the most common case).
            PropertyInfo pi = type.GetProperty(name, flags);
            if (pi != null) {
                result = pi.GetValue(obj, null);
                value = _convert.ToJsValue(result);
                return true;
            }

            // try field.
            FieldInfo fi = type.GetField(name, flags);
            if (fi != null) {
                result = fi.GetValue(obj);
                value = _convert.ToJsValue(result);
                return true;
            }

            // Then with an instance method: the problem is that we don't have a list of
            // parameter types so we just check if any method with the given name exists
            // and then keep alive a "weak delegate", i.e., just a name and the target.
            // The real method will be resolved during the invokation itself.
            BindingFlags mFlags = flags | BindingFlags.FlattenHierarchy;

            // TODO: This is probably slooow.
            if (type.GetMethods(mFlags).Any(x => x.Name == name)) {
                if (type == obj) {
                    result = new WeakDelegate(type, name);
                } else {
                    result = new WeakDelegate(obj, name);
                }
                value = _convert.ToJsValue(result);
                return true;
            }

            value = JsValue.Null;
            return false;
        }