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Gets the sign state of the field.
[Browsable(false)] public SignState SignState { get; }
<Browsable(False)> Public ReadOnly Property SignState As SignState
A SignState enum value indicates the sign.
None means do not show the sign, because now value is null. Positive means the state of the value is positive, we should show the positive sign. Negative means the state of the value is negative, we should show the negative sign.