Gets a value indicating whether the FileStream was opened asynchronously or synchronously.
Syntax
Value
true if the current System.IO.FileStream was opened asynchronously; otherwise, false.
Remarks
The IsAsync property detects whether the FileStream handle was opened asynchronously, enabling your code to use the FileStream.Handle property correctly. In Win32, IsAsync being true means the handle was opened for overlapped I/O, and thus requires different parameters to ReadFile and WriteFile.
You specify this value when you create an instance of the System.IO.FileStream class using a constructor that has an isAsync, useAsync, or options parameter. When the property is true, the stream utilizes overlapped I/O to perform file operations asynchronously. However, the FileStream.IsAsync property does not have to be true to call the FileStream.ReadAsync(Byte[], int, int, System.Threading.CancellationToken), FileStream.WriteAsync(Byte[], int, int, System.Threading.CancellationToken), or Stream.CopyToAsync(Stream) method. When the FileStream.IsAsync property is false and you call the asynchronous read and write operations, the UI thread is still not blocked, but the actual I/O operation is performed synchronously.
Requirements
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0