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I.10.5 Exceptions

The CLI supports an exception handling model, which is introduced in §I.12.4.2. CLS-compliant frameworks can define and throw externally visible exceptions, but there are restrictions on the type of objects thrown:

CLS Rule 40:

Objects that are thrown shall be of type System.Exception or a type inheriting from it. Nonetheless, CLS-compliant methods are not required to block the propagation of other types of exceptions.

[Note:

CLS (consumer): Need not support throwing or catching of objects that are not of the specified type.

CLS (extender): Must support throwing of objects of type System.Exception or a type inheriting from it. Need not support the throwing of objects having other types.

CLS (framework): Shall not publicly expose thrown objects that are not of type System.Exception or a type inheriting from it. end note]