WriteDocTypeAsync Method
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XmlWriter.WriteDocTypeAsync Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Asynchronously writes the DOCTYPE declaration with the specified name and optional attributes.

Namespace:  System.Xml
Assembly:  System.Xml (in System.Xml.dll)

public virtual Task WriteDocTypeAsync(
	string name,
	string pubid,
	string sysid,
	string subset
)

Parameters

name
Type: System.String
The name of the DOCTYPE. This must be non-empty.
pubid
Type: System.String
If non-null it also writes PUBLIC "pubid" "sysid" where pubid and sysid are replaced with the value of the given arguments.
sysid
Type: System.String
If pubid is null and sysid is non-null it writes SYSTEM "sysid" where sysid is replaced with the value of this argument.
subset
Type: System.String
If non-null it writes [subset] where subset is replaced with the value of this argument.

Return Value

Type: System.Threading.Tasks.Task
The task that represents the asynchronous WriteDocType operation.

ExceptionCondition
InvalidOperationException

An XmlWriter method was called before a previous asynchronous operation finished. In this case, InvalidOperationException is thrown with the message “An asynchronous operation is already in progress.”

InvalidOperationException

An XmlWriter asynchronous method was called without setting the Async flag to true. In this case, InvalidOperationException is thrown with the message “Set XmlWriterSettings.Async to true if you want to use Async Methods.”

This is the asynchronous version of WriteDocType(String, String, String, String), with the same functionality. To use this method, you must set the Async flag to true.

Windows Phone OS

Supported in: 8.1, 8.0

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