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WriteStartElement Method (String, String)

XmlWriter.WriteStartElement Method (String, String)

When overridden in a derived class, writes the specified start tag and associates it with the given namespace.

Namespace:  System.Xml
Assemblies:   System.Xml (in System.Xml.dll)
  System.Xml.ReaderWriter (in System.Xml.ReaderWriter.dll)

public void WriteStartElement(
	string localName,
	string ns
)

Parameters

localName
Type: System.String

The local name of the element.

ns
Type: System.String

The namespace URI to associate with the element. If this namespace is already in scope and has an associated prefix, the writer automatically writes that prefix also.

ExceptionCondition
InvalidOperationException

The writer is closed.

EncoderFallbackException

There is a character in the buffer that is a valid XML character but is not valid for the output encoding. For example, if the output encoding is ASCII, you should only use characters from the range of 0 to 127 for element and attribute names. The invalid character might be in the argument of this method or in an argument of previous methods that were writing to the buffer. Such characters are escaped by character entity references when possible (for example, in text nodes or attribute values). However, the character entity reference is not allowed in element and attribute names, comments, processing instructions, or CDATA sections.

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.”

After calling this method you can either write attributes, or create content using WriteComment, WriteString, or WriteStartElement for child elements. You can close the element with either WriteEndElement or WriteFullEndElement. For example, the following C# code:

 writer.WriteStartElement("item",null);
 writer.WriteString("some text");
 writer.WriteEndElement();

Generates the following output:

 <item>some text</item>

For the asynchronous version of this method, see WriteStartElementAsync.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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