XamlMember.IsUnknown Property
Important
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Gets a value that indicates whether the member is not resolvable by the backing system that is used for type and member resolution.
public:
property bool IsUnknown { bool get(); };public bool IsUnknown { get; }member this.IsUnknown : boolPublic ReadOnly Property IsUnknown As Booleantrue if the member is not resolvable; false if the member is resolvable.
A XamlMember that is constructed with the XamlMember(String, XamlType, Boolean) signature returns true for IsUnknown.
For a load path that involves XamlObjectWriter, a XamlMember with true for IsUnknown cannot be written into an object graph. Under the default implementations in .NET Framework XAML Services APIs, the XamlObjectWriter.WriteStartMember call throws a XamlObjectWriterException when the relevant XamlMember reports true for IsUnknown.
You should not construct a XamlMember that has a value of true for IsUnknown unless your implementation can handle the exceptions from XamlObjectWriter, or you have other ways to adjust the XamlObjectWriter behavior.
Calling IsUnknown invokes LookupIsUnknown or a specific override of that method.
| Produkt | Verzie |
|---|---|
| .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 |
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