XmlWriter.WriteStartDocument Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
When overridden in a derived class, writes the XML declaration with the version "1.0".
Namespace: System.Xml
Assembly: System.Xml (in System.Xml.dll)
Syntax
'Declaration
Public MustOverride Sub WriteStartDocument
public abstract void WriteStartDocument()
Exceptions
| Exception | Condition |
|---|---|
| InvalidOperationException | This is not the first write method called after the constructor. |
Remarks
The encoding level of the document is determined by how the writer is implemented. When WriteStartDocument is called the writer validates that what you are writing is a well-formed XML document. For example, it checks that the XML declaration is the first node, that one and only one root-level element exists, and so on. If this method is not called, the writer assumes an XML fragment is being written and applies no root level rules.
If WriteStartDocument has been called and then the WriteProcessingInstruction method is used to create another XML declaration, an exception will be thrown.
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
XNA Framework
Supported in: Xbox 360, Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
See Also