Provides base definitions for classes that consume XAML input and produce XAML node streams.
Assembly: System.Xaml (in System.Xaml.dll)
Thetype exposes the following members.
|IsDisposed||Gets whether Dispose has been called.|
|IsEof||When implemented in a derived class, gets a value that reports whether the reader position is at end-of-file.|
|Member||When implemented in a derived class, gets the current member at the reader position, if the reader position is on a StartMember.|
|Namespace||When implemented in a derived class, gets the XAML namespace information from the current node.|
|NodeType||When implemented in a derived class, gets the type of the current node.|
|SchemaContext||When implemented in a derived class, gets an object that provides XAML schema context information for the information set.|
|Type||When implemented in a derived class, gets the XamlType of the current node.|
|Value||When implemented in a derived class, gets the value of the current node.|
|Close||Closes the XAML node stream.|
|Dispose||Releases the unmanaged resources used by the , and optionally, releases the managed resources.|
|Equals(Object)||Determines whether the specified object is equal to the current object. (Inherited from Object.)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)|
|GetHashCode||Serves as the default hash function. (Inherited from Object.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|Read||When implemented in a derived class, provides the next XAML node from the source, if a node is available.|
|ReadSubtree||Returns a that is based on the current , where the returned is used to iterate through a subtree of the XAML node structure.|
|Skip||Skips the current node and advances the reader position to the next node.|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
is an abstract class and does not provide implementations or definitions that have a working result for all members. Members that do have an implementation in are noted in the remarks for that member. Specifically, has several abstract members that must be implemented, and several virtual members.
Of the virtual members, ReadSubtree and Skip each provide a default implementation that is appropriate for most cases. However, the ReadSubtree and Skip default implementations rely on other expected behavior of the implementing XAML reader; in particular, they rely on the Read override. Dispose is also a virtual member that has a working default implementation.
The following two classes are the most relevant and practical derived classes in .NET Framework XAML Services and the System.Xaml assembly:
XamlObjectReader, which reads an object graph, such as the active object graph of an application at run time.
differs from XML Document Object Model (DOM) and XmlReader design principles because does not have a Create method to return underlying default XAML reader implementations. You must instead instantiate specific derived XAML reader classes by calling their constructors or other class-specific helper APIs.
For the most part, you call API in the context of specific XAML reader classes that derive from . However, in one particular case, you access API on a practical XAML reader instance that is not public and not derived from XamlObjectReader or XamlXmlReader. This case is when you call ReadSubtree, which returns a instance. In the default implementation, the that is returned by this API is an internal class.
The obtained for subtree reading has valid actions for APIs such as Read and NodeType, and those actions are based on the parent reader class. This design enables the internal class to track the frame level where the subtree was entered. The acting subtree makes sure that if the current node position is moved beyond the bounds of the subtree, the specific subtree reader reports end-of-file or a null reference (Nothing in Visual Basic) at the current node.
Notes about subtree reader usage are included on certain APIs.