PuferFishContracts/PuferFishContracts/DataModels/PointsDataModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using PuferFishContracts.Infrastructure;
+using PuferFishContracts.Extensions;
+using PuferFishContracts.Exceptions;
+
+namespace PuferFishContracts.DataModels;
+
+public class PointsDataModel(string buyerId, DateTime pointsDate, double buyerPoints) : IValidation
+{
+    public string BuyerId { get; private set; } = buyerId;
+    public DateTime PointsDate { get; private set; } = pointsDate;
+    public double Points { get; private set; } = buyerPoints;
+    public void Validate()
+    {
+        if (BuyerId.IsEmpty())
+            throw new ValidationException("Field BuyerId is empty");
+        if (!BuyerId.IsGuid())
+            throw new ValidationException("The value in the field BuyerId is not a unique identifier");
+        if (Points <= 0)
+            throw new ValidationException("Field Points is less than or equal to 0");
+    }
+}

PuferFishContracts/PuferFishContracts/DataModels/SaleDataModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using PuferFishContracts.Infrastructure;
+using PuferFishContracts.Extensions;
+using PuferFishContracts.Exceptions;
+using System.Xml;
+
+namespace PuferFishContracts.DataModels;
+
+public class SaleDataModel(string id, string workerId, string? buyerId, double sum, double points, bool isCancel, List<SaleProductDataModel> products) : IValidation
+{
+    public string Id { get; private set; } = id;
+    public string WorkerId { get; private set; } = workerId;
+    public string? BuyerId { get; private set; } = buyerId;
+    public DateTime SaleDate { get; private set; } = DateTime.UtcNow;
+    public double Sum { get; private set; } = sum;
+    public double Points { get; private set; } = points;
+    public bool IsCancel { get; private set; } = isCancel;
+    public List<SaleProductDataModel> Products { get; private set; } = products;
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+        if (WorkerId.IsEmpty())
+            throw new ValidationException("Field WorkerId is empty");
+        if (!WorkerId.IsGuid())
+            throw new ValidationException("The value in the field WorkerId is not a unique identifier");
+        if (!BuyerId?.IsGuid() ?? !BuyerId?.IsEmpty() ?? false)
+            throw new ValidationException("The value in the field BuyerId is not a unique identifier");
+        if (Sum <= 0)
+            throw new ValidationException("Field Sum is less than or equal to 0");
+        if ((Products?.Count ?? 0) == 0)
+            throw new ValidationException("The sale must include products");
+    }
+}