feat: добавил дата модели роли кладовщик и контракт валидации, который и реализовал, добавил ошибку валидации

TheBank/BankContracts/DataModels/CreditProgramDataModel.cs

@@ -0,0 +1,69 @@
+using BankContracts.Exceptions;
+using BankContracts.Extensions;
+using BankContracts.Infrastructure;
+
+namespace BankContracts.DataModels;
+
+/// <summary>
+/// Дата модель кредитной программы
+/// </summary>
+/// <param name="id">уникальный Guid индентификатор</param>
+/// <param name="name">название</param>
+/// <param name="cost">сумма</param>
+/// <param name="maxCost">максимальная сумма</param>
+/// <param name="storekeeperId">уникальный Guid Индентификатор кладовщика</param>
+/// <param name="periodId">уникальный Guid Индентификатор срока</param>
+public class CreditProgramDataModel(string id, string name, decimal cost, decimal maxCost, string storekeeperId, string periodId) : IValidation
+{
+    public string Id { get; private set; } = id;
+
+    public string Name { get; private set; } = name;
+
+    public decimal Cost { get; private set; } = cost;
+    
+    public decimal MaxCost { get; private set; } = maxCost;
+
+    public string StorekeeperId { get; private set; } = storekeeperId;
+
+    public string PeriodId { get; private set; } = periodId;
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+        {
+            throw new ValidationException("Field Id is null or empty");
+        }
+        if (!Id.IsGuid())
+        {
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+        }
+        if (Name.IsEmpty())
+        {
+            throw new ValidationException("Field Name is null or empty");
+        }
+        if (Cost <= 0)
+        {
+            throw new ValidationException("Field Cost is less or equal to zero");
+        }
+        if (MaxCost <= 0)
+        {
+            throw new ValidationException("Field MaxCost is less or equal to zero");
+        }
+        if (StorekeeperId.IsEmpty())
+        {
+            throw new ValidationException("Field StorekeeperId is null or empty");
+        }
+        if (!StorekeeperId.IsGuid())
+        {
+            throw new ValidationException("The value in the field StorekeeperId is not a unique identifier");
+        }
+        if (PeriodId.IsEmpty())
+        {
+            throw new ValidationException("Field PeriodId is null or empty");
+        }
+        if (!PeriodId.IsGuid())
+        {
+            throw new ValidationException("The value in the field PeriodId is not a unique identifier");
+        }
+    }
+}