add pagination for repository and response message

Source/BSN.Commons.PresentationInfrastructure/BSN.Commons.PresentationInfrastructure.csproj

@@ -17,6 +17,7 @@
 
  <ItemGroup>
  <PackageReference Include="System.ComponentModel.Annotations" Version="4.7.0" />
+ <PackageReference Include="System.Text.Json" Version="7.0.2" />
  </ItemGroup>
 
 </Project>

Source/BSN.Commons.PresentationInfrastructure/Converters/JsonForceDefaultConverter.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace BSN.Commons.Converters
+{
+ public class JsonForceDefaultConverter<T> : JsonConverter<T>
+ {
+ public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+ {
+ return JsonSerializer.Deserialize<T>(ref reader);
+ }
+
+ public override void Write(Utf8JsonWriter writer, T value, JsonSerializerOptions options)
+ {
+ JsonSerializer.Serialize(writer, value);
+ }
+ }
+}

Source/BSN.Commons.PresentationInfrastructure/Responses/GenericResponseBase.cs

@@ -0,0 +1,9 @@
+namespace BSN.Commons.Responses
+{
+ public class GenericResponseBase<T> : Response where T : class
+ {
+ public T Data { get; set; }
+
+ public GenericResponseBase() { }
+ }
+}

Source/BSN.Commons.PresentationInfrastructure/Responses/GenericResponseBaseWithPagination.cs

@@ -0,0 +1,7 @@
+namespace BSN.Commons.Responses
+{
+ public class GenericResponseBaseWithPagination<T> : GenericResponseBase<T> where T : class
+ {
+ public PaginationMetadata Meta { get; set; }
+ }
+}

Source/BSN.Commons.PresentationInfrastructure/Responses/PaginationMetadata.cs

@@ -0,0 +1,13 @@
+namespace BSN.Commons.Responses
+{
+ public class PaginationMetadata
+ {
+ public uint Page { get; set; }
+
+ public uint PageCount { get; set; }
+
+ public uint PageSize { get; set; }
+
+ public uint RecordCount { get; set; }
+ }
+}

Source/BSN.Commons.PresentationInfrastructure/Responses/Response.cs

@@ -0,0 +1,19 @@
+using BSN.Commons.Converters;
+using BSN.Commons.PresentationInfrastructure;
+using System.Text.Json.Serialization;
+
+namespace BSN.Commons.Responses
+{
+ /// <summary>
+ /// During serialization and deserialization operations, enumeration values are always converted to and from strings.
+ /// This is possible through registering the 'JsonStringEnumConverter' in our DI infrastructure. There is once exception,
+ /// namely the 'StatusCode' property of the 'ResponseBase' class which should keep it's default numeral value when being converted.
+ /// </summary>
+ public class Response : ResponseBase
+ {
+ public new bool IsSuccess => (int)StatusCode >= 200 && (int)StatusCode <= 299;
+
+ [JsonConverter(typeof(JsonForceDefaultConverter<ResponseStatusCode>))]
+ public new ResponseStatusCode StatusCode { get; set; }
+ }
+}

Source/BSN.Commons/Dto/PagedEntityCollection.cs

@@ -0,0 +1,36 @@
+using System.Collections.Generic;
+
+namespace BSN.Commons.Dto
+{
+ /// <summary>
+ /// Stores the paginated data for the given entity type.
+ /// </summary>
+ /// <typeparam name="T">Type of Entity for which pagination is being implemented.</typeparam>
+ public class PagedEntityCollection<T>
+ {
+ /// <summary>
+ /// Current page number
+ /// </summary>
+ public uint CurrentPage { get; set; }
+
+ /// <summary>
+ /// Total number of pages
+ /// </summary>
+ public uint PageCount { get; set; }
+
+ /// <summary>
+ /// Number of records per page
+ /// </summary>
+ public uint PageSize { get; set; }
+
+ /// <summary>
+ /// Total number of records that exist for the query
+ /// </summary>
+ public uint RecordCount { get; set; }
+
+ /// <summary>
+ /// IEnumerable of the paginated data
+ /// </summary>
+ public IEnumerable<T> Results { get; set; }
+ }
+}

Source/BSN.Commons/Extensions/IQueryableExtensions.cs

@@ -0,0 +1,30 @@
+using BSN.Commons.Dto;
+using System;
+using System.Linq;
+
+namespace BSN.Commons.Extensions
+{
+ public static partial class IQueryableExtensions
+ {
+ public static PagedEntityCollection<T> Paginate<T>(this IQueryable<T> query, uint pageNumber, uint pageSize)
+ {
+ if (pageNumber == 0)
+ throw new ArgumentException("Must be greater than zero.", nameof(pageNumber));
+
+ if (pageSize == 0)
+ throw new ArgumentException("Must be greater than zero.", nameof(pageSize));
+
+ var result = new PagedEntityCollection<T>
+ {
+ CurrentPage = pageNumber,
+ PageSize = pageSize,
+ RecordCount = (uint)query.Count(),
+ Results = query.Skip((int)((pageNumber - 1) * pageSize)).Take((int)pageSize).ToList()
+ };
+
+ result.PageCount = (uint)Math.Ceiling((double)result.RecordCount / pageSize);
+
+ return result;
+ }
+ }
+}