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XmlReader.ReadContentAsBase64Async(Byte[], Int32, Int32) Method


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

 virtual System::Threading::Tasks::Task<int> ^ ReadContentAsBase64Async(cli::array <System::Byte> ^ buffer, int index, int count);
public virtual System.Threading.Tasks.Task<int> ReadContentAsBase64Async (byte[] buffer, int index, int count);
abstract member ReadContentAsBase64Async : byte[] * int * int -> System.Threading.Tasks.Task<int>
override this.ReadContentAsBase64Async : byte[] * int * int -> System.Threading.Tasks.Task<int>
Public Overridable Function ReadContentAsBase64Async (buffer As Byte(), index As Integer, count As Integer) As Task(Of Integer)



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


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


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


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.

This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as ArgumentException, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by ReadContentAsBase64(Byte[], Int32, Int32).

Applies to

See also