Get Parameter from POST/GET/HEADER for ASP.NET vNext

ParameterExtension.vb_cs

namespace AspNetVnextUtils
{


    public static class ParameterExtensions
    {

        private static System.Reflection.FieldInfo InitFieldInfo()
        {
            System.Type t = typeof(System.Collections.Specialized.NameObjectCollectionBase);
            System.Reflection.FieldInfo fi = t.GetField("_entriesTable", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);

            if(fi == null) // Mono
                fi = t.GetField("m_ItemsContainer", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);

            return fi;
        }

        private static System.Reflection.FieldInfo m_fi = InitFieldInfo();


        public static bool ContainsKey(this System.Collections.Specialized.NameValueCollection nvc, string key)
        {
            //System.Collections.Specialized.NameValueCollection nvc = new System.Collections.Specialized.NameValueCollection();
            //nvc.Add("hello", "world");
            //nvc.Add("test", "case");

            // The Hashtable is case-INsensitive
            System.Collections.Hashtable ent = (System.Collections.Hashtable)m_fi.GetValue(nvc);
            return ent.ContainsKey(key);
        } // End Function ContainsKey 


        //private static bool ContainsKey(System.Collections.Specialized.NameValueCollection nvc, string key)
        //{
        //    foreach (string str in nvc.AllKeys)
        //    {
        //        if (System.StringComparer.InvariantCultureIgnoreCase.Equals(str, key))
        //            return true;
        //    }

        //    return false;
        //} // End Function ContainsKey 


        public static bool ContainsParameter(System.Web.HttpContext context, string name)
        {
            return ContainsKey(context.Request.QueryString, name)
            || ContainsKey(context.Request.Form, name)
            || ContainsKey(context.Request.Headers, name)
            || ContainsKey(context.Request.ServerVariables, name)
            ;
        }


        public static string GetParameter(System.Web.HttpContext context, string name)
        {
            bool exists = false;
            return GetParameter(context, name, ref exists);
        }


        public static string GetParameter(System.Web.HttpContext context, string name, ref bool exists)
        {
            // System.Collections.Specialized.NameValueCollection nvc = new System.Collections.Specialized.NameValueCollection();

            //nvc.Add(context.Request.QueryString);
            //nvc.Add(context.Request.Form);
            //nvc.Add(context.Request.Headers);
            //nvc.Add(context.Request.ServerVariables);

            if (ContainsKey(context.Request.QueryString, name))
            {
                exists = true;
                return context.Request.QueryString[name];
            }

            if (ContainsKey(context.Request.Form, name))
            {
                exists = true;
                return context.Request.Form[name];
            }

            if (ContainsKey(context.Request.Headers, name))
            {
                exists = true;
                return context.Request.Headers[name];
            }

            if (ContainsKey(context.Request.ServerVariables, name))
            {
                exists = true;
                return context.Request.ServerVariables[name];
            }

            //foreach (var key in context.Request.QueryString.AllKeys)
            //{
            //    string[] vals = context.Request.QueryString.GetValues(key);
            //}

            //foreach (var key in context.Request.Form.AllKeys)
            //{
            //    string[] vals = context.Request.Form.GetValues(key);
            //}

            //foreach (var key in context.Request.Headers.AllKeys)
            //{
            //    string[] vals = context.Request.Headers.GetValues(key);
            //}

            //foreach (var key in context.Request.ServerVariables.AllKeys)
            //{
            //    string[] vals = context.Request.ServerVariables.GetValues(key);
            //}


            // foreach(var x in context.Request.Cookies.AllKeys) {}

            return null;
        } // End Function GetParameter


    } // End static class ParameterExtensions


} // End Namespace AspNetVnextUtils





        Public NotInheritable Class ParameterExtensions
            

            Private Shared Function InitFieldInfo() As System.Reflection.FieldInfo
                Dim t As System.Type = GetType(System.Collections.Specialized.NameObjectCollectionBase)
                Dim fi As System.Reflection.FieldInfo = t.GetField("_entriesTable", System.Reflection.BindingFlags.Instance Or System.Reflection.BindingFlags.NonPublic)

                If fi Is Nothing Then ' Mono
                    fi = t.GetField("m_ItemsContainer", System.Reflection.BindingFlags.Instance Or System.Reflection.BindingFlags.NonPublic)
                End If

                Return fi
            End Function

            Private Shared m_fi As System.Reflection.FieldInfo = InitFieldInfo()


            ' <System.Runtime.CompilerServices.Extension> _
            Public Shared Function ContainsKey(nvc As System.Collections.Specialized.NameValueCollection, key As String) As Boolean
                ' The Hashtable is case-INsensitive
                Dim ent As System.Collections.Hashtable = DirectCast(m_fi.GetValue(nvc), System.Collections.Hashtable)
                Return ent.ContainsKey(key)
            End Function ' ContainsKey


        End Class