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'<typename>' cannot be used as an attribute because it has 'MustOverride' methods that have not been overridden

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Classes with MustOverride methods cannot be used as attributes.

MustOverride members of attribute classes can only be used from derived classes that override such members.

Error ID: BC31507

To correct this error

  1. Remove the MustOverride modifier from attribute class members.

  2. Implement MustOverride members in a derived class, and use that class as an attribute.

See Also

Reference

AttributeUsageAttribute

Other Resources

Custom Attributes in Visual Basic