[AttributeUsage(AttributeTargets.Delegate | AttributeTargets.Enum | AttributeTargets.Struct | AttributeTargets.Class, Inherited=false), ComVisible(true)]

public sealed class SerializableAttribute : Attribute

{ // Methods

[TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] public SerializableAttribute();

internal static Attribute GetCustomAttribute(RuntimeType type);

internal static bool IsDefined(RuntimeType type);

}

internal static bool IsDefined(RuntimeType type) { return type.IsSerializable; }

反编译之后的SerializableAttribute定义

里面有IsDefined属性 来标记 是否可序列化  希望能帮到你