XamlXmlWriter Class

Definition

Namespace:

System.Xaml

Assembly:

System.Xaml.dll

Uses a TextWriter or XmlWriter support class to write a XAML node stream to a text or markup serialized form.

public ref class XamlXmlWriter : System::Xaml::XamlWriter

public class XamlXmlWriter : System.Xaml.XamlWriter

type XamlXmlWriter = class
    inherit XamlWriter

Public Class XamlXmlWriter
Inherits XamlWriter

Inheritance

Object

XamlWriter

XamlXmlWriter

Remarks

This class is typically used in serialization scenarios.

How to Use XamlXmlWriter

The XamlWriter API has several methods that write different types of XAML nodes. Collectively, these are referred to in documentation as the Write methods of a XamlWriter. XamlXmlWriter uses several internal state classes to determine what to do when one of its Write implementations is called. A Write call uses the states to determine whether the requested element, attribute, or value can be written, or whether an exception is thrown. For example, if you call WriteEndObject and the state of the XamlXmlWriter current node position is on a value or within a member, an exception is thrown. Typically, callers of the XamlXmlWriter API should be aware of the type of the current XAML node that is coming from the XAML reader and the XAML node stream. Based on this knowledge, callers should avoid calling Write APIs that are not relevant to the current node type.

XAML Namespaces and XamlXmlWriter

The XAML namespace writing behavior of XamlXmlWriter is complex and is not limited to explicit calls to WriteNamespace. Instead, other Write calls, such as WriteStartObject, might require that the namespace declaration be written at particular points in the node structure. The XAML writer either generates a prefix by its own logic, or uses information from the INamespacePrefixLookup service to determine a preferred prefix. Also, explicit WriteNamespace calls might defer or might return nothing if the XAML namespace declaration is already applicable and declared elsewhere.

Write Method Exceptions

Exceptions thrown by the XamlXmlWriter Write methods are typically either InvalidOperationException or XamlXmlWriterException.

An InvalidOperationException often indicates that a XAML reader passed an invalid node structure into the XAML node stream. In this case the node structure is invalid for reasons that are not related to validation of a XAML schema or a XAML schema context. Rather, the node stream is invalid in its basic form. For example, if a faulty XAML reader implementation generated a XAML node stream that contained two consecutive StartObject nodes, the attempt to call the second WriteStartObject would throw an InvalidOperationException. All XAML writers would consider such an operation to be invalid. Another example of an InvalidOperationException is when XAML namespace information is unavailable through the XAML schema context that applies to the current node stream position.

A XamlXmlWriterException indicates an exception where this particular XAML writer implementation chooses to throw an exception based on its intended functionality. A XamlXmlWriterException can indicate specific cases where a XamlXmlWriter violates its own state or settings. For example, a XamlXmlWriterException might result from attempts to write XAML namespace information into a position that the XamlXmlWriter and its serialization format do not support, or writing duplicate members when the instance's XamlXmlWriterSettings forbid it.

Constructors

XamlXmlWriter(Stream, XamlSchemaContext)	Initializes a new instance of the XamlXmlWriter class from a stream.
XamlXmlWriter(Stream, XamlSchemaContext, XamlXmlWriterSettings)	Initializes a new instance of the XamlXmlWriter class from a stream using a writer settings object.
XamlXmlWriter(TextWriter, XamlSchemaContext)	Initializes a new instance of the XamlXmlWriter class from a TextWriter basis.
XamlXmlWriter(TextWriter, XamlSchemaContext, XamlXmlWriterSettings)	Initializes a new instance of the XamlXmlWriter class from a TextWriter basis using a settings object.
XamlXmlWriter(XmlWriter, XamlSchemaContext)	Initializes a new instance of the XamlXmlWriter class from a XmlWriter basis.
XamlXmlWriter(XmlWriter, XamlSchemaContext, XamlXmlWriterSettings)	Initializes a new instance of the XamlXmlWriter class from a XmlWriter basis using a settings object.

Properties

IsDisposed	Gets whether Dispose(Boolean) has been called. (Inherited from XamlWriter)
SchemaContext	Gets the XAML schema context that this XamlXmlWriter uses for processing.
Settings	Gets the writer settings that this XamlXmlWriter uses for XAML processing.

Methods

Close()	Closes the XAML writer object. (Inherited from XamlWriter)
Dispose(Boolean)	Releases the unmanaged resources used by XamlXmlWriter and optionally releases the managed resources.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
Flush()	Calls the Flush method of the underlying XmlWriter or TextWriter, which writes anything that is currently in the buffer, and then closes the writer.
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)
ToString()	Returns a string that represents the current object. (Inherited from Object)
WriteEndMember()	Writes a XAML end member node to the underlying XmlWriter or TextWriter. Throws an exception if the current position of the XAML node stream is not within a member, or if the internal writer state does not support writing to an end member.
WriteEndObject()	Writes a XAML end object node to the underlying XmlWriter or TextWriter. Throws an exception if the current position of the XAML node stream that is being processed is incompatible with writing an end object.
WriteGetObject()	Writes an object for cases where the specified object is a default or implicit value of the property that is being written, instead of being specified as an object value in the input XAML node set.
WriteNamespace(NamespaceDeclaration)	Writes namespace information to the underlying XmlWriter or TextWriter. May throw an exception for certain states; however, may instead defer writing the namespace information until the writer and the XAML node stream that is being processed reaches a position where a XAML namespace declaration can be inserted.
WriteNode(XamlReader)	Performs switching based on node type from the XAML reader (NodeType) and calls the relevant Write method for the writer implementation. (Inherited from XamlWriter)
WriteStartMember(XamlMember)	Writes a XAML start member node to the underlying XmlWriter or TextWriter. Throws an exception if the current position of the XAML node stream is within another member, or if it is not in a scope or writer state where a start member can be written.
WriteStartObject(XamlType)	Writes a XAML start object node to the underlying XmlWriter or TextWriter. Throws an exception if the current position of the XAML node stream is not in a scope where a start object can be written, or if the writer is not in a state that can write a start object.
WriteValue(Object)	Writes a XAML value node to the underlying XmlWriter or TextWriter. Throws an exception if the current position of the XAML node stream is invalid for writing a value, or the writer is in a state where a value cannot be written.

Explicit Interface Implementations

IDisposable.Dispose()

See Dispose(). (Inherited from XamlWriter)

See also

• Save(Stream, Object)
• Understanding XAML Node Stream Structures and Concepts