CategoricalVector<T>.MissingValueRepresentation Property

public override MissingValueRepresentation MissingValueRepresentation { get; }

Public Overrides ReadOnly Property MissingValueRepresentation As MissingValueRepresentation
	Get

public:
virtual property MissingValueRepresentation MissingValueRepresentation {
	MissingValueRepresentation get () override;
}

abstract MissingValueRepresentation : MissingValueRepresentation with get
override MissingValueRepresentation : MissingValueRepresentation with get

Property Value

This property is part of the implementation contract for derived vector types.

None means the vector does not provide a missing-value representation. ByValue means missingness is represented by comparing a specific in-band stored value with MissingValue. LogicalMask means missingness is represented by a separate Boolean mask. IndexMask means missingness is represented by a separate index structure or negative-index convention.

The base implementation returns ByValue because IsMissing(Int32) compares the stored value with MissingValue. Setting MayHaveMissingValues to false disables missing-value handling for a vector instance, but does not change the representation capability reported by this property.

A derived type that overrides IsMissing(Int32) with mask-based or otherwise out-of-band semantics must override MissingValueRepresentation consistently.

Reference