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GerstITS.Examples.Logic/Customers/Contracts/Customer.cs

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+using GerstITS.Examples.Logic.Shared.Search.Sorting;
+
+namespace GerstITS.Examples.Logic.Customers;
+
+public class Customer : ISortable
+{
+    #region Properties
+
+    public int Id { get; set; }
+    public string FirstName { get; set; }
+    public string LastName { get; set; }
+    public string EMail { get; set; }
+    public string DisplayName { get; set; }
+    public bool IsActive { get; set; }
+
+    #endregion
+}

GerstITS.Examples.Logic/Customers/Contracts/CustomerNote.cs

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+namespace GerstITS.Examples.Logic.Customers;
+
+public class CustomerNote
+{
+    #region Properties
+
+    public int Id { get; set; }
+    public string Text { get; set; }
+    public DateTime ValidFrom { get; set; }
+
+    #endregion
+}

GerstITS.Examples.Logic/Customers/Contracts/CustomerSearchFilter.cs

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+using GerstITS.Search;
+
+namespace GerstITS.Examples.Logic.Customers;
+
+public class CustomerSearchFilter : SearchFilterBase
+{
+    #region Properties
+
+    public string Name { get; set; }
+    public string EMail { get; set; }
+
+    #endregion
+}

GerstITS.Examples.Logic/Customers/Contracts/ICustomerProvider.cs

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+using GerstITS.Data;
+using GerstITS.Search;
+
+namespace GerstITS.Examples.Logic.Customers;
+
+public interface ICustomerProvider
+{
+    Customer GetById(int id);
+    Customer GetById(int id, bool includeInactive);
+
+    SearchResult<Customer> Search(CustomerSearchFilter filter);
+
+    Customer Create(Customer customer);
+    Customer Update(Customer customer);
+
+    bool Delete(int id);
+    bool Delete(int id, bool forceDelete);
+
+    BulkResult Import(IEnumerable<Customer> customers);
+
+    IEnumerable<CustomerNote> GetNotes(int customerId);
+    CustomerNote AddNote(int customerId, string text);
+}