Готовый слой Contracts.

BlacksmithWorkshop/BlacksmithWorkshopContracts/BindingModels/MessageInfoBindingModel.cs

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+using BlacksmithWorkshopDataModels.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BlacksmithWorkshopContracts.BindingModels
+{
+	public class MessageInfoBindingModel : IMessageInfoModel
+	{
+		public string MessageId { get; set; } = string.Empty;
+
+		public int? ClientId { get; set; }
+
+		public string SenderName { get; set; } = string.Empty;
+
+		public DateTime DateDelivery { get; set; } = DateTime.Now;
+
+		public string Subject { get; set; } = string.Empty;
+
+		public string Body { get; set; } = string.Empty;
+	}
+}

BlacksmithWorkshop/BlacksmithWorkshopContracts/BusinessLogicsContracts/IMessageInfoLogic.cs

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+using BlacksmithWorkshopContracts.BindingModels;
+using BlacksmithWorkshopContracts.SearchModels;
+using BlacksmithWorkshopContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BlacksmithWorkshopContracts.BusinessLogicsContracts
+{
+	public interface IMessageInfoLogic
+	{
+		List<MessageInfoViewModel>? ReadList(MessageInfoSearchModel? model);
+
+		bool Create(MessageInfoBindingModel model);
+	}
+}

BlacksmithWorkshop/BlacksmithWorkshopContracts/SearchModels/MessageInfoSearchModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BlacksmithWorkshopContracts.SearchModels
+{
+	public class MessageInfoSearchModel
+	{
+		public string? MessageId { get; set; }
+
+		public int? ClientId { get; set; }
+
+		public string? SenderName { get; set; }
+
+		public DateTime? DateDelivery { get; set; }
+	}
+}

BlacksmithWorkshop/BlacksmithWorkshopContracts/StoragesContracts/IMessageInfoStorage.cs

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+using BlacksmithWorkshopContracts.BindingModels;
+using BlacksmithWorkshopContracts.SearchModels;
+using BlacksmithWorkshopContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BlacksmithWorkshopContracts.StoragesContracts
+{
+	public interface IMessageInfoStorage
+	{
+		List<MessageInfoViewModel> GetFullList();
+
+		List<MessageInfoViewModel> GetFilteredList(MessageInfoSearchModel model);
+
+		MessageInfoViewModel? GetElement(MessageInfoSearchModel model);
+
+		MessageInfoViewModel? Insert(MessageInfoBindingModel model);
+	}
+}

BlacksmithWorkshop/BlacksmithWorkshopContracts/ViewModels/MessageInfoViewModel.cs

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+using BlacksmithWorkshopDataModels.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BlacksmithWorkshopContracts.ViewModels
+{
+	public class MessageInfoViewModel : IMessageInfoModel
+	{
+		public string MessageId { get; set; } = string.Empty;
+
+		public int? ClientId { get; set; }
+
+		public string SenderName { get; set; } = string.Empty;
+
+		public DateTime DateDelivery { get; set; } = DateTime.Now;
+
+		public string Subject { get; set; } = string.Empty;
+
+		public string Body { get; set; } = string.Empty;
+	}
+}

BlacksmithWorkshop/BlacksmithWorkshopDataModels/Models/IMessageInfoModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BlacksmithWorkshopDataModels.Models
+{
+	public interface IMessageInfoModel
+	{
+		string MessageId { get; }
+
+		int? ClientId { get; }
+
+		string SenderName { get; }
+
+		DateTime DateDelivery { get; }
+
+		string Subject { get; }
+
+		string Body { get; }
+	}
+}