string ip = Request.Headers["X-Forwarded-For"].FirstOrDefault();
if (string.IsNullOrEmpty(ip))
ip = Request.HttpContext.Connection.RemoteIpAddress.ToString();
获取用户IP或IP访问地址,上面的可简化成
string ip=Request.Headers["X-Forwarded-For"].FirstOrDefault() ?? Request.HttpContext.Connection.RemoteIpAddress.ToString();
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