Creates a Source from a Files contents. Emitted elements are chunkSize sized ByteString elements, except the final element, which will be up to chunkSize in size. You can configure the default dispatcher for this Source by changing the "akka.stream.blocking-io-dispatcher" or set it for a given Source by using ActorAttributes. It materializes a TaskTResult of IOResult containing the number of bytes read from the source file upon completion, and a possible exception if IO operation was not completed successfully.

public static Source<ByteString, Task<IOResult>> FromFile(
	FileInfo f,
	int chunkSize = 8192
)

static member FromFile : 
        f : FileInfo * 
        ?chunkSize : int 
(* Defaults:
        let _chunkSize = defaultArg chunkSize 8192
*)
-> Source<ByteString, Task<IOResult>>