Parameters

buffer

The buffer to write data to.

offset

The byte offset in buffer at which to begin writing.

numBytes

The maximum number of bytes to write.

userCallback

The method to call when the asynchronous write operation is completed. This parameter is optional.

stateObject

The status of the asynchronous write.

Returns

An IAsyncResult that represents the asynchronous write, which is possibly still pending. This IAsyncResult must be passed to this stream's System.IO.Stream.EndWrite(IAsyncResult) method to ensure that the write is complete, then frees resources appropriately. This can be done either by the same code that called System.IO.Stream.BeginWrite(Byte[], int, int, AsyncCallback, object) or in a callback passed to System.IO.Stream.BeginWrite(Byte[], int, int, AsyncCallback, object).

Remarks

If a System.IO.IsolatedStorage.IsolatedStorageFileStream object is writable, writing at the end of the stream expands the stream.

The current position in the stream is updated when you issue the asynchronous read or write, not when the I/O operation completes.

You must call System.IO.Stream.EndWrite(IAsyncResult) with the IAsyncResult object that this method returns to find out how many bytes were written.

Requirements