Opc.Ua.ContentFilter.GetBuiltInType C# (CSharp) Method

        private static BuiltInType GetBuiltInType(object value)
		{
            if (value == null)
            {
                return BuiltInType.Null;
            }
                
            // return the type of the element for array values.
            Type systemType = value.GetType();

            if (value is Array)
            {
                systemType = systemType.GetElementType();
            }            

			if (systemType == typeof(bool))            { return BuiltInType.Boolean;         }
			if (systemType == typeof(sbyte))           { return BuiltInType.SByte;           }
			if (systemType == typeof(byte))            { return BuiltInType.Byte;            }
			if (systemType == typeof(short))           { return BuiltInType.Int16;           }
			if (systemType == typeof(ushort))          { return BuiltInType.UInt16;          }
			if (systemType == typeof(int))             { return BuiltInType.Int32;           }
			if (systemType == typeof(uint))            { return BuiltInType.UInt32;          }
			if (systemType == typeof(long))            { return BuiltInType.Int64;           }
			if (systemType == typeof(ulong))           { return BuiltInType.UInt64;          }
			if (systemType == typeof(float))           { return BuiltInType.Float;           }
			if (systemType == typeof(double))          { return BuiltInType.Double;          }
			if (systemType == typeof(string))          { return BuiltInType.String;          }
			if (systemType == typeof(DateTime))        { return BuiltInType.DateTime;        }
			if (systemType == typeof(Guid))            { return BuiltInType.Guid;            }
			if (systemType == typeof(Uuid))            { return BuiltInType.Guid;            }
			if (systemType == typeof(byte[]))          { return BuiltInType.ByteString;      }
			if (systemType == typeof(XmlElement))      { return BuiltInType.XmlElement;      }
			if (systemType == typeof(NodeId))          { return BuiltInType.NodeId;          }
			if (systemType == typeof(ExpandedNodeId))  { return BuiltInType.ExpandedNodeId;  }
			if (systemType == typeof(StatusCode))      { return BuiltInType.StatusCode;      } 
		    if (systemType == typeof(DiagnosticInfo))  { return BuiltInType.DiagnosticInfo;  }
		    if (systemType == typeof(QualifiedName))   { return BuiltInType.QualifiedName;   }
		    if (systemType == typeof(LocalizedText))   { return BuiltInType.LocalizedText;   }
			if (systemType == typeof(ExtensionObject)) { return BuiltInType.ExtensionObject; }
			if (systemType == typeof(DataValue))       { return BuiltInType.DataValue;       }
			if (systemType == typeof(Variant))         { return BuiltInType.Variant;         }
			if (systemType == typeof(object))          { return BuiltInType.Variant;         }

            if (systemType.GetTypeInfo().IsEnum)
            {
                return BuiltInType.Enumeration;
            }

            // not a recognized type.
            return BuiltInType.Null;
	    }