Созданы реализации интерфейсов хранилищ

LawFirm/LawFirmFileImplement/Implements/BlankStorage.cs

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+using LawFirmContracts.BindingModels;
+using LawFirmContracts.SearchModels;
+using LawFirmContracts.StorageContracts;
+using LawFirmContracts.ViewModels;
+using LawFirmFileImplement.Models;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LawFirmFileImplement.Implements
+{
+    public class BlankStorage : IBlankStorage
+    {
+        private readonly DataFileSingleton source;
+
+        public BlankStorage()
+        {
+            source = DataFileSingleton.GetInstance();
+        }
+
+        public BlankViewModel? GetElement(BlankSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.BlankName) && !model.Id.HasValue)
+            {
+                return null;
+            }
+            return source.Blanks
+            .FirstOrDefault(x => (!string.IsNullOrEmpty(model.BlankName) && x.BlankName == model.BlankName) || (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
+        }
+
+        public List<BlankViewModel> GetFilteredList(BlankSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.BlankName))
+            {
+                return new();
+            }
+            return source.Blanks
+                .Where(x => x.BlankName.Contains(model.BlankName))
+                .Select(x => x.GetViewModel)
+                .ToList();
+        }
+
+        public List<BlankViewModel> GetFullList()
+        {
+            return source.Blanks.Select(x => x.GetViewModel).ToList();
+        }
+
+        public BlankViewModel? Insert(BlankBindingModel model)
+        {
+            model.Id = source.Blanks.Count > 0 ? source.Blanks.Max(x => x.Id) + 1 : 1;
+            var newBlank = Blank.Create(model);
+            if (newBlank == null)
+            {
+                return null;
+            }
+            source.Blanks.Add(newBlank);
+            source.SaveBlanks();
+            return newBlank.GetViewModel;
+        }
+
+        public BlankViewModel? Update(BlankBindingModel model)
+        {
+            var blank = source.Blanks.FirstOrDefault(x => x.Id == model.Id);
+            if (blank == null)
+            {
+                return null;
+            }
+            blank.Update(model);
+            source.SaveBlanks();
+            return blank.GetViewModel;
+        }
+        public BlankViewModel? Delete(BlankBindingModel model)
+        {
+            var blank = source.Blanks.FirstOrDefault(x => x.Id == model.Id);
+            if (blank == null)
+            {
+                return null;
+            }
+            blank.Update(model);
+            source.SaveBlanks();
+            return blank.GetViewModel;
+        }
+
+    }
+}

LawFirm/LawFirmFileImplement/Implements/DocumentStorage.cs

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+using LawFirmContracts.BindingModels;
+using LawFirmContracts.SearchModels;
+using LawFirmContracts.StorageContracts;
+using LawFirmContracts.ViewModels;
+using LawFirmFileImplement.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LawFirmFileImplement.Implements
+{
+    internal class DocumentStorage : IDocumentStorage
+    {
+        private readonly DataFileSingleton source;
+
+        public DocumentStorage()
+        {
+            source = DataFileSingleton.GetInstance();
+        }
+
+        public DocumentViewModel? GetElement(DocumentSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.DocumentName) && !model.Id.HasValue)
+            {
+                return null;
+            }
+            return source.Documents
+            .FirstOrDefault(x => (!string.IsNullOrEmpty(model.DocumentName) && x.DocumentName == model.DocumentName) || (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
+        }
+
+        public List<DocumentViewModel> GetFilteredList(DocumentSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.DocumentName))
+            {
+                return new();
+            }
+            return source.Documents
+                .Where(x => x.DocumentName.Contains(model.DocumentName))
+                .Select(x => x.GetViewModel)
+                .ToList();
+        }
+
+        public List<DocumentViewModel> GetFullList()
+        {
+            return source.Documents.Select(x => x.GetViewModel).ToList();
+        }
+
+        public DocumentViewModel? Insert(DocumentBindingModel model)
+        {
+            model.Id = source.Documents.Count > 0 ? source.Documents.Max(x => x.Id) + 1 : 1;
+            var newDoc = Document.Create(model);
+            if (newDoc == null)
+            {
+                return null;
+            }
+            source.Documents.Add(newDoc);
+            source.SaveDocuments();
+            return newDoc.GetViewModel;
+        }
+
+        public DocumentViewModel? Update(DocumentBindingModel model)
+        {
+            var document = source.Documents.FirstOrDefault(x => x.Id == model.Id);
+            if (document == null)
+            {
+                return null;
+            }
+            document.Update(model);
+            source.SaveDocuments();
+            return document.GetViewModel;
+        }
+        public DocumentViewModel? Delete(DocumentBindingModel model)
+        {
+            var document = source.Documents.FirstOrDefault(x => x.Id == model.Id);
+            if (document == null)
+            {
+                return null;
+            }
+            document.Update(model);
+            source.SaveDocuments();
+            return document.GetViewModel;
+        }
+
+    }
+}

LawFirm/LawFirmFileImplement/Implements/OrderStorage.cs

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+using LawFirmContracts.BindingModels;
+using LawFirmContracts.SearchModels;
+using LawFirmContracts.StorageContracts;
+using LawFirmContracts.ViewModels;
+using LawFirmFileImplement.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LawFirmFileImplement.Implements
+{
+    internal class OrderStorage : IOrderStorage
+    {
+        private readonly DataFileSingleton source;
+
+        public OrderStorage()
+        {
+            source = DataFileSingleton.GetInstance();
+        }
+
+        public OrderViewModel? GetElement(OrderSearchModel model)
+        {
+            if (!model.Id.HasValue)
+            {
+                return null;
+            }
+            return source.Orders
+            .FirstOrDefault(x => (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
+        }
+
+        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
+        {
+            if (!model.Id.HasValue)
+            {
+                return new();
+            }
+            return source.Orders
+                .Where(x => x.Id == model.Id)
+                .Select(x => x.GetViewModel)
+                .ToList();
+        }
+
+        public List<OrderViewModel> GetFullList()
+        {
+            return source.Orders.Select(x => x.GetViewModel).ToList();
+        }
+
+        public OrderViewModel? Insert(OrderBindingModel model)
+        {
+            model.Id = source.Orders.Count > 0 ? source.Orders.Max(x => x.Id) + 1 : 1;
+            var newOrder = Order.Create(model);
+            if (newOrder == null)
+            {
+                return null;
+            }
+            source.Orders.Add(newOrder);
+            source.SaveOrders();
+            return newOrder.GetViewModel;
+        }
+
+        public OrderViewModel? Update(OrderBindingModel model)
+        {
+            var order = source.Orders.FirstOrDefault(x => x.Id == model.Id);
+            if (order == null)
+            {
+                return null;
+            }
+            order.Update(model);
+            source.SaveOrders();
+            return order.GetViewModel;
+        }
+        public OrderViewModel? Delete(OrderBindingModel model)
+        {
+            var order = source.Orders.FirstOrDefault(x => x.Id == model.Id);
+            if (order == null)
+            {
+                return null;
+            }
+            order.Update(model);
+            source.SaveOrders();
+            return order.GetViewModel;
+        }
+
+    }
+}