diff --git a/src/xtd.core/include/xtd/collections/generic/params.h b/src/xtd.core/include/xtd/collections/generic/params.h
index f9d0748938f..df8d8be4000 100644
--- a/src/xtd.core/include/xtd/collections/generic/params.h
+++ b/src/xtd.core/include/xtd/collections/generic/params.h
@@ -68,10 +68,8 @@ namespace xtd {
         /// @}
         
         /// @cond
-        params(const params&) noexcept = default;
-        params(params&&) noexcept = default;
-        params(const base_type& il) noexcept : items_(il) {}
-        params(base_type&& il) noexcept : items_(il) {}
+        params(base_type items) noexcept : items_(items) {}
+        params& operator =(base_type items) noexcept {items_ = items; return *this;}
         /// @endcond
         
         /// @name Public Properties
@@ -81,21 +79,21 @@ namespace xtd {
         /// @return A pointer to the first element in the params.
         /// @remarks If the params is empty, the values of begin() and end() are unspecified, but will be identical.
         constexpr iterator begin() const noexcept {return items_.begin();}
-
+        
         /// @brief Returns pointer to the underlying array serving as element storage.
         /// @return Pointer to the underlying element storage. For non-empty containers, the returned pointer compares equal to the address of the first element.
         /// @remarks The pointer is such that range [xtd::collections::generic::list::data(), xtd::collections::generic::list::data() + xtd::collections::generic::list::size()) is always a valid range, even if the container is empty (xtd::collections::generic::list::data() is not dereferenceable in that case).
-        virtual const_pointer data() const noexcept {return reinterpret_cast<const_pointer>(begin());}
-
+        const_pointer data() const noexcept {return reinterpret_cast<const_pointer>(begin());}
+        
         /// @brief Returns a pointer to one past the last element in the params, i.e. begin() + size().
         /// @return A pointer to one past the last element in the params.
         /// @remarks If the params is empty, the values of begin() and end() are unspecified, but will be identical.
         constexpr iterator end() const noexcept {return items_.end();}
-
+        
         /// @brief Returns the underlying base type items.
         /// @return The underlying base type items.
-        virtual const base_type& items() const noexcept {return items_;}
-
+        const base_type& items() const noexcept {return items_;}
+        
         /// @brief Returns the number of elements in the params, i.e. `std::distance(begin(), end())`.
         /// @return The number of elements in the params.
         constexpr size_type size() const noexcept {return items_.size();}
@@ -113,14 +111,19 @@ namespace xtd {
         /// @brief Returns a reference to the underlying base type.
         /// @return Reference to the underlying base type.
         operator const base_type&() const noexcept {return items_;}
-        /// @brief Returns a reference to the underlying base type.
-        /// @return Reference to the underlying base type.
-        operator base_type&() noexcept {return items_;}
         /// @}
         
       private:
         base_type items_;
       };
+      
+      /// @cond
+      // C++17 deduction
+      // {
+      template<typename type_t>
+      params(std::initializer_list<type_t>) -> params<type_t>;
+      // }
+      /// @endcond
     }
   }
 }