Program.cs文件中

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

Controller中

private readonly IHttpContextAccessor httpContextAccessor;
public XXXXXXXController(IHttpContextAccessor _httpContextAccessor)
{
  httpContextAccessor = _httpContextAccessor;
}

Controller中需要使用的地方

        [HttpGet]
        [Route("XXXXXXXXXXX")]
        public voild XXXXXXXXX()
        {
            //获取用户ip地址
            var ip= httpContextAccessor.HttpContext.Connection.RemoteIpAddress.ToString();
        }