Collapse the table of content
Expand the table of content
Expand Minimize

XmlReader::ReadContentAsBase64Async Method

.NET Framework 4.6 and 4.5

Asynchronously reads the content and returns the Base64 decoded binary bytes.

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

virtual Task<int>^ ReadContentAsBase64Async(
	array<unsigned char>^ buffer, 
	int index, 
	int count


Type: array<System::Byte>

The buffer into which to copy the resulting text. This value cannot be nullptr.

Type: System::Int32

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

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.Threading.Tasks::Task<Int32>
The number of bytes written to the buffer.


An XmlReader 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.”


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

This is the asynchronous version of ReadContentAsBase64, with the same functionality. To use this method, you must set the Async flag to true.

.NET Framework

Supported in: 4.6, 4.5

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8
Was this page helpful?
(1500 characters remaining)
Thank you for your feedback
© 2015 Microsoft