XamlDirective.LookupIsUnknown Method
Definition
Important
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Returns whether this XamlDirective represents a member that is not resolvable by the backing system that is used for type and member resolution.
protected:
override bool LookupIsUnknown();protected override sealed bool LookupIsUnknown();override this.LookupIsUnknown : unit -> boolProtected Overrides NotOverridable Function LookupIsUnknown () As Booleantrue if this XamlDirective represents a non-resolvable member; otherwise, false.
The XamlDirective implementation only calls base and does nothing more. The base implementation returns the results in this order: the results are based on internal reflection; or the results are based on checking for a null value of the UnderlyingMember. The XamlDirective implementation seals this virtual member; therefore, all XamlDirective types and all predefined XAML directives must use this behavior.
Applies to
| Product | Versions |
|---|---|
| .NET Framework | 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| Windows Desktop | 3.0, 3.1, 5, 6, 7, 8, 9, 10 |
