教學小例子:簡易的webSevrer

Console.WriteLine("http服務開始監聽......");

server.Start;

while (true)
{
var inStr = Console.ReadLine;

Debug.Assert(inStr != null, "inStr != null");
if (inStr.Equals("STOP", StringComparison.OrdinalIgnoreCase))
{
break;
}
Console.WriteLine("輸入 stop 可停止服務！");
}
}
}

public class SimpleWebServer : IDisposable
{

private readonly HttpListener _httpListener;

private readonly string _baseFolder;

public SimpleWebServer(string uriPrefix, string baseFloder)
{
_httpListener = new HttpListener;
_httpListener.Prefixes.Add(uriPrefix);
_baseFolder = baseFloder;
}

public async void Start
{
_httpListener.Start;

while (true)
{
try
{
var context = await _httpListener.GetContextAsync;
#pragma warning disable 4014
Task.Factory.StartNew( =>{
PrcessRequestAsync(context);
});

}
catch (HttpListenerException exception)
{
Console.WriteLine(exception);
break;
}
catch (InvalidOperationException exception)
{
Console.WriteLine(exception);

break;
}
}
}

private async void PrcessRequestAsync(HttpListenerContext context)
{
try
{
string filename = Path.GetFileName(context.Request.RawUrl);

// ReSharper disable once AssignNullToNotNullAttribute
string path = Path.Combine(_baseFolder, filename);

byte msg = new byte[0];
if (File.Exists(path))
{
if (context.Request.HttpMethod == "GET")
{
context.Response.StatusCode = (int) HttpStatusCode.OK;
msg = File.ReadAllBytes(path);
}
else if (context.Request.HttpMethod=="POST")
{
context.Response.StatusCode = (int)HttpStatusCode.Created;

}
else
{
context.Response.StatusCode = (int) HttpStatusCode.HttpVersionNotSupported;
}

}
else
{
Console.WriteLine($"資源不存在:{path}");

context.Response.StatusCode = (int) HttpStatusCode.NotFound;

msg = Encoding.Default.GetBytes(" ...你網址打錯了... ");
}

context.Response.ContentLength64 = msg.Length;

using (Stream s = context.Response.OutputStream)
{
await s.WriteAsync(msg, 0, msg.Length);

}
}
catch (Exception exception)
{
Console.WriteLine($"請求發生了錯誤:{exception}");
}
}