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Editorial Team
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Asked: 2026-06-15T03:36:12+00:00

When designing custom exceptions for .NET, MSDN provides these guidelines . In particular, the

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When designing custom exceptions for .NET, MSDN provides these guidelines. In particular, the guidelines state that a custom exception:

  • should be serializable, i.e. implement ISerializable and be decorated with the [Serializable] attribute, and
  • should implement the (de)serialization constructor, i.e. protected CustomException(SerializationInfo info, StreamingContext context).

However, in a Portable Class Library neither of SerializableAttribute, ISerializable and SerializationInfo are supported.

How should I sufficiently design a custom exception in a Portable Class Library that simultaneously targets .NET Framework and one or more platforms?

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1 Answer

  1. Editorial Team

    Basically, ignore that guidance – that is for full .NET, and does not apply to portable class library projects. Indeed, if we look at (say) Silverlight (which includes WP7) we see:

    [ClassInterfaceAttribute(ClassInterfaceType.None)]
[ComVisibleAttribute(true)]
public class Exception

    Frankly, the main consumer of that requirement was remoting… and that is not in huge demand now.

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