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XmlTextReader.ReadContentAsBase64 Method

Reads the content and returns the Base64 decoded binary bytes.

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

'Declaration
Public Overrides Function ReadContentAsBase64 ( _
	buffer As Byte(), _
	index As Integer, _
	count As Integer _
) As Integer

Parameters

buffer
Type: System.Byte()

The buffer into which to copy the resulting text. This value cannot be Nothing.

index
Type: System.Int32

The offset into the buffer where to start copying the result.

count
Type: System.Int32

The maximum number of bytes to copy into the buffer. The actual number of bytes copied is returned from this method.

Return Value

Type: System.Int32
The number of bytes written to the buffer.

ExceptionCondition
ArgumentNullException

The buffer value is Nothing.

InvalidOperationException

ReadContentAsBase64 is not supported in the current node.

ArgumentOutOfRangeException

The index into the buffer or index + count is larger than the allocated buffer size.

NoteNote

Starting with the .NET Framework 2.0, we recommend that you create XmlReader instances by using the XmlReader.Create method to take advantage of new functionality.

This method streams the content, decodes the Base64 content, and returns the decoded binary bytes (for example, an inline Base64-encoded GIF image) into the buffer. This method can be called successively to read large streams of embedded text. For more information, see RFC 1521, "MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Specifying and Describing the Format of Internet Message Bodies". You can obtain RFCs from the Request for Comments Web site at http://www.rfc-editor.org.

NoteNote

You should not access any of the reader properties between calls to the ReadContentAsBase64 method until the method returns the value 0.

This method has the following behavior:

  • ReadContentAsBase64 returns the value 0 when it has reached the end of the byte stream it was operating on. The reader is positioned on the first non-content node.

  • If you ask for fewer, or the exact number, of bytes than are left in the stream the reader remains in its current position.

  • ReadContentAsBase64 is not supported on the following XML node types: Element, XmlDeclaration, None, Document, DocumentType, Notation, Entity, DocumentFragment.

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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