Add project

Common/Common.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Remove="Requests\**" />
+    <Compile Remove="Responses\**" />
+    <EmbeddedResource Remove="Requests\**" />
+    <EmbeddedResource Remove="Responses\**" />
+    <None Remove="Requests\**" />
+    <None Remove="Responses\**" />
+  </ItemGroup>
+
+</Project>

Common/Dtos/Common/BaseResponse.cs

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+using System.Net;
+
+namespace Common.Dtos.Common;
+
+public abstract class BaseResponse
+{
+    public bool Ok { get; set; }
+    public string? Error { get; set; }
+}

Common/Dtos/Common/PagedList.cs

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+namespace Common.Dtos.Common;
+
+public class PagedList<T>
+{
+    public PagedList(T[] items, int pageNumber, int pageSize, int totalItemsCount, int numberOfPages)
+    {
+        Items = items;
+        PageNumber = pageNumber;
+        PageSize = pageSize;
+        TotalItemsCount = totalItemsCount;
+        NumberOfPages = numberOfPages;
+    }
+
+    public static PagedList<T> Empty(int pagedNumber, int pageSize)
+        => new([], pagedNumber, pageSize, 0, 0);
+
+    public T[] Items { get; }
+    public int PageNumber { get; }
+    public int PageSize { get; }
+    public int TotalItemsCount { get; }
+    public int NumberOfPages { get; }
+}

Common/Dtos/Common/PagedRequest.cs

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+namespace Common.Dtos.Common;
+
+public abstract class PagedRequest
+{
+    public int PageNumber { get; set; }
+    public int PageSize { get; set; }
+}

Common/Dtos/Common/ValidationProblems.cs

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+namespace Common.Dtos.Common;
+
+public class ValidationProblems
+{
+    public ValidationProblems()
+    {
+        Errors = [];
+    }
+
+    public List<string> Errors { get; set; }
+}

Common/Dtos/Season/CreateSeasonRequest.cs

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+namespace Common.Dtos.Season;
+
+public class CreateSeasonRequest
+{
+    public string? Name { get; set; }
+    public DateOnly StartDate { get; set; }
+    public DateOnly EndDate { get; set; }
+}

Common/Dtos/Season/CreateSeasonResponse.cs

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+using Common.Dtos.Common;
+
+namespace Common.Dtos.Season;
+
+public class CreateSeasonResponse : BaseResponse
+{
+    public string? CreateSeasonResult { get; set; }
+}

Common/Dtos/Season/GetSeasonsRequest.cs

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+using Common.Dtos.Common;
+
+namespace Common.Dtos.Season;
+
+public class GetSeasonsRequest : PagedRequest
+{
+    public string? Name { get; set; }
+    public bool? HideObsolete { get; set; }
+}

Common/Dtos/Season/SeasonDto.cs

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+namespace Common.Dtos.Season;
+
+public class SeasonDto
+{
+    public int Id { get; set; }
+    public string? Name { get; set; }
+    public DateOnly StartDate { get; set; }
+    public DateOnly EndDate { get; set; }
+    public bool IsCurrent => StartDate <= DateOnly.FromDateTime(DateTime.Now) && EndDate >= DateOnly.FromDateTime(DateTime.Now);
+}

Common/Dtos/Specialization/CreateSpecializationRequest.cs

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+namespace Common.Dtos.Specialization;
+
+public class CreateSpecializationRequest
+{
+    public string? Name { get; set; }
+    public string? ShortName { get; set; }
+}

Common/Dtos/Specialization/CreateSpecializationResponse.cs

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+using Common.Dtos.Common;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Common.Dtos.Specialization
+{
+    public class CreateSpecializationResponse : BaseResponse
+    {
+        public string? CreateSpecializationResult { get; set; }
+    }
+}

Common/Dtos/Specialization/GetSpecializationsRequest.cs

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+using Common.Dtos.Common;
+
+namespace Common.Dtos.Specialization; 
+
+public class GetSpecializationsRequest : PagedRequest
+{
+    public string? Name { get; set; }
+}

Common/Dtos/Specialization/SpecializationDto.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Diagnostics.CodeAnalysis;
+using System.Text;
+
+namespace Common.Dtos.Specialization;
+
+public class SpecializationDto
+{
+    public int Id { get; set; }
+    public string? Name { get; set; }
+    public string? ShortName { get; set; }
+}

Common/Dtos/Student/CreateStudentRequest.cs

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+namespace Common.Dtos.Student;
+
+public class CreateStudentRequest
+{
+    public required string FirstName { get; set; }
+    public required string LastName { get; set; }
+    public required string AlbumNumber { get; set; }
+}

Common/Dtos/Student/CreateStudentResponse.cs

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+using Common.Dtos.Common;
+
+namespace Common.Dtos.Student;
+
+public class CreateStudentResponse : BaseResponse
+{
+    public string? CreateStudentResult { get; set; }
+}

Common/Dtos/Student/StudentBasicDto.cs

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+namespace Common.Dtos.Student;
+
+public class StudentBasicDto 
+{
+    public Guid Id { get; set; }
+    public string? FirstName { get; set; }
+    public string? LastName { get; set; }
+    public string? AlbumNumber { get; set; }
+    public string FullNameReverese => $"{LastName} {FirstName} ({AlbumNumber})";
+}

Common/Dtos/Subject/CreateSubjectRequest.cs

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+namespace Common.Dtos.Subject;
+
+public class CreateSubjectRequest
+{
+    public string? Name { get; set; }
+    public string? ShortName { get; set; }
+}

Common/Dtos/Subject/CreateSubjectResponse.cs

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+using Common.Dtos.Common;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Common.Dtos.Subject
+{
+    public class CreateSubjectResponse : BaseResponse
+    {
+        public string? CreateSubjectResult { get; set; }
+    }
+}

Common/Dtos/Subject/GetSubjectsRequest.cs

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+using Common.Dtos.Common;
+
+namespace Common.Dtos.Subject;
+
+public class GetSubjectsRequest : PagedRequest
+{
+    public string? Name { get; set; }
+}

Common/Dtos/Subject/SubjectDto.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Common.Dtos.Subject;
+
+public class SubjectDto
+{
+    public int Id { get; set; }
+    public string? Name { get; set; }
+    public string? ShortName { get; set; }
+}

Common/Extensions/JsonExtensions.cs

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+using System.Text.Json;
+
+namespace Common.Extensions
+{
+    public static class JsonExtensions
+    {
+        private static JsonSerializerOptions _jso = new() { PropertyNameCaseInsensitive = true, PropertyNamingPolicy = JsonNamingPolicy.CamelCase };
+        public static string ToJson<T>(this T source) => JsonSerializer.Serialize(source, _jso);
+        public static T FromJson<T>(this string source) => JsonSerializer.Deserialize<T>(source, _jso) ?? default!;
+    }
+}

Common/Extensions/StringExtensions.cs

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+using Common.Pagination;
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Text;
+
+namespace Common.Extensions;
+
+public static class StringExtensions
+{
+    public static IDictionary<string, object?> AsDictionary(this object source, 
+        BindingFlags bindingAttr = BindingFlags.FlattenHierarchy | BindingFlags.Public | BindingFlags.Instance)
+    {
+        return source.GetType().GetProperties(bindingAttr).ToDictionary
+        (
+            propInfo => propInfo.Name,
+            propInfo => propInfo.GetValue(source, null)
+        );
+    }
+}

Common/Pagination/PaginationExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Common.Pagination;
+
+public static class PaginationExtensions
+{
+    public static string ToPaginationSummary(this PaginationProperties props)
+    {
+        var before = (props.PageSize * (props.PageNumber - 1)) + 1;
+        var after = Math.Min((props.PageSize * props.PageNumber), props.TotalItems);
+        return props.TotalItems == 0 ? $"{props.Text}: brak" : $"{props.Text}: {before}-{after} z {props.TotalItems}";
+    }
+}

Common/Pagination/PaginationProperties.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Common.Pagination;
+
+public class PaginationProperties
+{
+    public PaginationProperties(string text, int pageSize)
+    {
+        Text = text;
+        PageNumber = 1;
+        PageSize = pageSize;
+    }
+
+    public int PageNumber { get; set; }
+    public int PageSize { get; set; }
+    public int TotalItems { get; set; }
+    public int NumberOfPages { get; set; }
+    public string? Text { get; set; }
+}