.Net Core 中间件

这里的中间件概念和express.js中的是一致的,

下面栗子的代码来源： Net Core中间件封装原理示例demo解析

public static class RequestIpExtensions
{
    public static IApplicationBuilder UseRequestIp(this IApplicationBuilder builder)
    {
        return builder.UseMiddleware<RequestIPMiddleware>();
    }
}

each middleware extension method is exposed on IApplicationBuilder through the Microsoft.AspNetCore.Builder namespace. 通过IApplicationBuilder接口方法引入中间件，IApplicationBuilder由Microsoft.AspNetCore.Builder命名空间提供

中间件的具体实现

public class RequestIPMiddleware
{
    private readonly RequestDelegate _next;
    private readonly ILogger _logger;

    public RequestIPMiddleware(RequestDelegate next, ILoggerFactory loggerFactory)
    {
        _next = next;
        _logger = loggerFactory.CreateLogger<RequestIPMiddleware>();
    }

    public async Task Invoke(HttpContext context)
    {
        _logger.LogInformation("User Ip: " + context.Connection.RemoteIpAddress.ToString());
        await _next.Invoke(context);
    }
}

使用中间

Startup.cs

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    ....
    app.UseRequestIp();
}