ASP.NET Core启动流程
ASP.NET Core启动流程
new WebHostBuilder()
初始化类型WebHostBuilder的属性
IServer _server
List<Action> _configures
UseHttpListener()
这是IWebHostBuilder下面的一个扩展方法
UseServer(new HttpListenerServer(urls))
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new HttpListenerServer(urls)
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HttpListener _httpListener
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string[] _urls
httpServer要监听的请求地址
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UseServer(new HttpListenerServer(urls))
- 给IServer _server赋值,值为HttpListenerServer实例
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return IWebHostBuilder
Configure(app => app.Use())
配置应用程序,中间件
给List<Action> _configures赋值,值为Action
return IWebHostBuilder
Build()
new ApplicationBuilder()
- 初始化List<Func<RequestDelegate, RequestDelegate>> _middlewares
遍历List<Action> _configures
- 赋值为空的ApplicationBuilder()
return new WebHost(_server, builder.Build())
参数分别为HTTPServer,(new ApplicationBuilder()).Build()
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builder.Build()
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_middlewares.Reverse()
反转所有的中间件
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return httpContext =>{… };
构建中间件
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RequestDelegate next = _ => { _.Response.StatusCode = 404; return Task.CompletedTask; };
定义请求处理失败的中间件(委托)
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foreach (var middleware in _middlewares)
{
next = middleware(next);
}将所有的中间件处理成委托链表
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return next(httpContext);
返回请求的处理委托链表
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StartAsync()
_server.StartAsync(_handler)
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Array.ForEach(_urls, url => _httpListener.Prefixes.Add(url));
将需要监听的http地址赋值给HTTPServer
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_httpListener.Start();
启动HTTPServer
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while (true){…}
监听HTTP请求
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var listenerContext = await _httpListener.GetContextAsync();
服务器生成HTTP请求原始上下文,包括原始request和response
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var feature = new HttpListenerFeature(listenerContext);
根据原始上下文生成HttpServerFeature,包括IHttpRequestFeature, IHttpResponseFeature
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var features = new FeatureCollection()
.Set(feature)
.Set(feature);生成(初始化)FeatureCollection(值为k-v形式)
分别设置key为IHttpRequestFeature,IHttpResponseFeature,value都是feature -
var httpContext = new HttpContext(features);
生成(初始化)ASP.NET Core的http请求上下文,包括HttpRequest,HttpResponse
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await handler(httpContext);
请求处理
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listenerContext.Response.Close();
发送响应到客户端,请求结束
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本文地址:https://blog.csdn.net/SXML123456/article/details/107550439