WpfDataUi.DataUiGrid.GetOrInstantiateAndAddMemberCategory C# (CSharp) Méthode

        private MemberCategory GetOrInstantiateAndAddMemberCategory(string categoryName)
        {
            MemberCategory memberCategory = Categories.FirstOrDefault(item => item.Name == categoryName);
            if (memberCategory == null)
            {
                memberCategory = new MemberCategory(categoryName);
                Categories.Add(memberCategory);
            }
            return memberCategory;
        }