XmlTextReader::ReadContentAsBase64 Method (array<Byte>^, Int32, Int32)
Reads the content and returns the Base64 decoded binary bytes.
Assembly: System.Xml (in System.Xml.dll)
public: virtual int ReadContentAsBase64( array<unsigned char>^ buffer, int index, int count ) override
Parameters
- buffer
-
Type:
array<System::Byte>^
The buffer into which to copy the resulting text. This value cannot be null.
- 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.
| Exception | Condition |
|---|---|
| ArgumentNullException | The buffer value is null. |
| 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. |
Note |
|---|
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.
Note |
|---|
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.
Available since 2.0
XmlReader
ReadContentAsBase64
XmlNodeType
XmlTextReader Class
System.Xml Namespace
