我使用以下代码实现了这一点:
protected void Application_BeginRequest(Object sender, EventArgs e)
        {
            var ClientSourceIP = Context.Request.Headers["CLIENT_SRC_IP"];
            var HTTPClientSourceIP = Context.Request.Headers["HTTP_CLIENT_SRC_IP"];
            var isValidClientSourceIP = ClientSourceIP == null || 
                Regex.IsMatch(ClientSourceIP, ConfigurationManager.AppSettings["ValidClientSourceIP"]);
            var isValidHTTPClientSourceIP = HTTPClientSourceIP == null || 
                Regex.IsMatch(HTTPClientSourceIP, ConfigurationManager.AppSettings["ValidHTTPClientSourceIP"]);
            if (
                (Context.Request.Path.Contains("elmah.axd") || Context.Request.Path.Contains("elvue.aspx")) &&
                ((isValidClientSourceIP && isValidHTTPClientSourceIP) == false)
            )
            {
                this.Context.Response.StatusCode = 403;
                return;
            }
        }