How to asynchronously read files

Asynchronously reads files, triggers an event after reading is complete, and notifies the main thread. The main thread and the reading thread are independent of each other.

Using System;
Using System. Collections. Generic;
Using System. Text;
Using System. IO;
Using System. Diagnostics;
Using System. Threading;

Namespace ExToDB. FileTransfer
{
/// <Summary>
/// Read files Asynchronously
/// </Summary>
Public class AsyncProcessor
{
Private Stream inputStream;

Public Stream InputStream
{
Get {return inputStream ;}
Set {inputStream = value ;}
}

// The size of each read Block
Private int bufferSize = 2048;

Public event ReturnEndEvent IsReturnEvent;

Protected void OnIsReturnEvent ()
{
If (IsReturnEvent! = Null)
IsReturnEvent (this, new ReturnEndReadEventargs (true ));
}

Public int BufferSize
{
Get {return bufferSize ;}
Set {bufferSize = value ;}
}

// Supports the cache of received data
Private byte [] buffer;

Public AsyncProcessor (string fileName)
{
Buffer = new byte [bufferSize];

// Open the file and specify the parameter to true to support asynchronous operations
InputStream = new FileStream (fileName, FileMode. Open, FileAccess. Read, FileShare. Read, bufferSize, true );
}

/// <Summary>
/// Start reading
/// </Sum