RAD Studio VCL Reference
EVariantInvalidNullOpError Class

EVariantInvalidNullOpError is the exception class for invalid Null variant operations.

EVariantInvalidNullOpError = class(EVariantInvalidOpError);
class EVariantInvalidNullOpError : public EVariantInvalidOpError;

EVariantInvalidNullOpError is raised when a variant operation fails because the operation is not valid for Null variants. To raise this exception programmatically, call VarInvalidNullOp.

Note: Do not raise EVariantInvalidNullOpError unless NullEqualityRule or NullMagnitudeRule is ncrError, and a corresponding operation has been attempted.

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