C#.NET6 ASP.NET CORE MVC 获取客户端IP

重点是拿到HttpContext 对象。

先从Headers["Cdn-Src-Ip"] 中取IP，其次从Headers["X-Forwarded-For"] 取，最后从context.Connection.RemoteIpAddress 中取。

有可能遇到“::ffff:192.168.2.131” 这种IP,把"::ffff:"Replace掉。

工具类CoreMvcClientIpUtil：

namespace CommonUtils
{
    public static class CoreMvcClientIpUtil
    {
        public static string GetClientIP(HttpContext context)
        {
            var ip = context.Request.Headers["Cdn-Src-Ip"].FirstOrDefault();
            if (!string.IsNullOrEmpty(ip))
                return IpReplace(ip);

            ip = context.Request.Headers["X-Forwarded-For"].FirstOrDefault();
            if (!string.IsNullOrEmpty(ip))
                return IpReplace(ip);

            ip = context.Connection.RemoteIpAddress.ToString();

            return IpReplace(ip);
        }

        static string IpReplace(string inip)
        {
            //::ffff:
            //::ffff:192.168.2.131 这种IP处理
            if (inip.Contains("::ffff:"))
            {
                inip = inip.Replace("::ffff:", "");
            }
            return inip;
        }

    }
}

一、使用HttpContextAccessor

在Program.cs中增加一行：

//获取IP使用
builder.Services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddControllersWithViews();

//获取IP使用
builder.Services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
}
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");

app.Run();

修改Controller:

全局变量增加

private readonly IHttpContextAccessor _httpContextAccessor;

构造函数增加

_httpContextAccessor = httpContextAccessor;

Action中获取IP

var ip = CoreMvcClientIpUtil.GetClientIP(_httpContextAccessor.HttpContext);

using CommonUtils;
using CommonUtils.Extensions;
using Microsoft.AspNetCore.Mvc;

namespace AspNetCoreMvcClientIp2.Controllers
{
    public class OkController : Controller
    {
        private readonly IHttpContextAccessor _httpContextAccessor;

        public OkController(IHttpContextAccessor httpContextAccessor)
        {
            _httpContextAccessor = httpContextAccessor;
        }
        // GET: OkController
        public ActionResult Index()
        {
            var ip = CoreMvcClientIpUtil.GetClientIP(_httpContextAccessor.HttpContext);
            ViewBag.myip1 = "ip:" + ip;

            //直接实例化HttpContextAccessor
            IHttpContextAccessor ih = new HttpContextAccessor();
            string ip2 = CoreMvcClientIpUtil.GetClientIP(ih.HttpContext);
            ViewBag.myip2 = "ip2:" + ip2;

            //使用ControllerBase的HttpContext
            var ip3 = CoreMvcClientIpUtil.GetClientIP(HttpContext);
            ViewBag.myip3 = "ip3:" + ip3;

            //扩展方法
            var ip4 = HttpContext.GetClientIP();
            ViewBag.myip4 = "ip4:" + ip4;

            return View();
        }

         
    }
}

也可以直接实例化HttpContextAccessor：

IHttpContextAccessor ih = new HttpContextAccessor();
            string ip2 = CoreMvcClientIpUtil.GetClientIP(ih.HttpContext);

二、使用ControllerBase的HttpContext

//使用ControllerBase的HttpContext
            var ip3 = CoreMvcClientIpUtil.GetClientIP(HttpContext);
            ViewBag.myip3 = "ip3:" + ip3;

三、扩展HttpContext

using Microsoft.AspNetCore.Http;

namespace CommonUtils.Extensions
{
    public static class HttpContextExtension
    {
        public static string GetClientIP(this HttpContext context)
        {
            var ip = context.Request.Headers["Cdn-Src-Ip"].FirstOrDefault();
            if (!string.IsNullOrEmpty(ip))
                return IpReplace(ip);

            ip = context.Request.Headers["X-Forwarded-For"].FirstOrDefault();
            if (!string.IsNullOrEmpty(ip))
                return IpReplace(ip);

            ip = context.Connection.RemoteIpAddress.ToString();

            return IpReplace(ip);
        }

        static string IpReplace(string inip)
        {
            //::ffff:
            //::ffff:192.168.2.131 这种IP处理
            if (inip.Contains("::ffff:"))
            {
                inip = inip.Replace("::ffff:", "");
            }
            return inip;
        }
    }
}

在Controller中使用时要using CommonUtils.Extensions;

var ip4 = HttpContext.GetClientIP();
            ViewBag.myip = "ip4:" + ip4;

。