IFieldState<T>.IsUnknown(T) Method
Definition
Important
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Test to see if the field value form state has a value.
public bool IsUnknown (T state);abstract member IsUnknown : 'T -> boolPublic Function IsUnknown (state As T) As BooleanParameters
- state
- T
Form state to check.
Returns
True if value is unknown.
Remarks
For value types (numbers, bools, date time) a value is unknown only if the field is nullable and it is null. For enum based values (both simple and enumerated) they can also be nullable or the 0 enum value if not nullable. For non value types like string the test is to see if the field is actually null.