正在捕获http标头属性

Hi我在C#中实现了以下代码，用于捕获标头属性。出于某种原因，我只得到名字的数据，其余字段显示为null。我知道它们有值，但由于某种原因，它们显示为null。

// Load ServerVariable collection into NameValueCollection object.
            System.Collections.Specialized.NameValueCollection headerdetails = Request.Headers;
            List<string> requiredHeaders = new List<string>();
            requiredHeaders.Add("FirstName");
            requiredHeaders.Add("MiddleName");
            requiredHeaders.Add("LastName");
            requiredHeaders.Add("email");

            // Get names of all keys into a string array. 
            String[] arr1 = headerdetails.AllKeys;
            for (int i = 0; i < arr1.Length; i++)
            {
                if (requiredHeaders.Contains(arr1[i]))
                {
                    if (arr1[i] == "FirstName")
                    {
                        String[] arr2 = headerdetails.GetValues(arr1[i]);
                        for (int values = 0; values < arr2.Length; values++)
                        {
                            string firstname = Server.HtmlEncode(arr2[values]);
                            Session["firstName"] = firstname;
                        }
                    }
                    if (arr1[i] == "MiddleName")
                    {
                        String[] arr2 = headerdetails.GetValues(arr1[i]);
                        for (int values = 0; values < arr2.Length; values++)
                        {
                            string middlename = Server.HtmlEncode(arr2[values]);
                            Session["middleName"] = middlename;
                        }
                    }
                    if (arr1[i] == "LastName")
                    {
                        String[] arr2 = headerdetails.GetValues(arr1[i]);
                        for (int values = 0; values < arr2.Length; values++)
                        {
                            string lastname = Server.HtmlEncode(arr2[values]);
                            Session["lastName"] = lastname;
                        }
                    }
                    if (arr1[i] == "email")
                    {
                        String[] arr2 = headerdetails.GetValues(arr1[i]);
                        for (int values = 0; values < arr2.Length; values++)
                        {
                            string email = Server.HtmlEncode(arr2[values]);
                            Session["emailID"] = email;
                        }
                    }