task

Task/Task.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31205.134
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Task", "Task\Task.csproj", "{C5ED86F8-7583-4039-A1FC-AB7C1CACF91B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{C5ED86F8-7583-4039-A1FC-AB7C1CACF91B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C5ED86F8-7583-4039-A1FC-AB7C1CACF91B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C5ED86F8-7583-4039-A1FC-AB7C1CACF91B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C5ED86F8-7583-4039-A1FC-AB7C1CACF91B}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {5A895920-F6AA-4C11-B7E4-87299C7A499F}
+	EndGlobalSection
+EndGlobal

Task/Task/Program.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+namespace HwProjTask
+{
+    class Entity1
+    {
+        public int EntityId { get; set; }
+        public string Data { get; set; }
+        public DateTime CreationTime { get; set; }
+        public int? Entity2Id { get; set; }
+        public bool Flag { get; set; }
+
+        public Entity1(int id, string data, DateTime time, int? id2, bool flag)
+        {
+            EntityId = id;
+            Data = data;
+            CreationTime = time;
+            Entity2Id = id2;
+            Flag = flag;
+        }
+    }
+
+    class Entity2
+    {
+        public int EntityId { get; set; }
+        public double Data { get; set; }
+        public DateTime CreationDate { get; set; }
+
+        public Entity2(int id, double data, DateTime time)
+        {
+            EntityId = id;
+            Data = data;
+            CreationDate = time;
+        }
+    }
+
+    class EntityAggregate
+    {
+        public int EntityId { get; set; }
+        public string Data { get; set; }
+        public DateTime CreationTime { get; set; }
+        public bool Flag { get; set; }
+
+        public Entity2 E2;
+        public EntityAggregate(Entity1 e1, Entity2 e2)
+        {
+            EntityId = e1.EntityId;
+            Data = e1.Data;
+            CreationTime = e1.CreationTime;
+            Flag = e1.Flag;
+            E2 = e2;
+        }
+    }
+
+    class Program
+    {
+        /// Задача:
+        /// Даны два массива сущностей,
+        /// Сущности из первого массива содержат идентификаторы сущностей из второго массива,
+        /// Реализовать Join, обьединяющий данные сущностей из двух массивов,
+        /// Вернуть массив EntityAggregate, содержащий обьединённые данные,
+        /// предварительно отфильтровав сущности из первого массива по entity.Flag == hasFlag
+        ///
+        /// Пример работы:
+        ///
+        /// Входные данные:
+        /// e1 = Entity1(EntityId = 1,
+        ///              Data = "123",
+        ///              Flag = false,
+        ///              Entity2Id = 2,
+        ///              CreationDate = 29.10.1999)
+        ///
+        /// e2 = Entity2(EntityId = 2,
+        ///              Data = 2.4,
+        ///              CreationDate = 30.10.1999)
+        ///
+        /// hasFlag = false
+        ///
+        /// Возвращаемое значение:
+        /// EntityAggregate(EntityId = 1,
+        ///                 Data = "123",
+        ///                 Flag = false,
+        ///                 CreationDate = 29.10.1999,
+        ///                 Entity2 = Entity2(EntityId = 2,
+        ///                                   Data = 2.4,
+        ///                                   CreationDate = 30.10.1999)
+
+        static EntityAggregate[] Join(Entity1[] e1, Entity2[] e2, bool hasFlag)
+        {
+            var entityQueue = new Queue<EntityAggregate>();
+            for (int i = 0; i < e1.Length; i++)
+            {
+                if (e1[i].Flag == hasFlag)
+                {
+                    if (e1[i].Entity2Id == null)
+                    {
+                        entityQueue.Enqueue(new EntityAggregate(e1[i], null));
+                    }
+                    else
+                    {
+                        for (int j = 0; j < e2.Length; j++)
+                        {
+                            if (e1[i].Entity2Id == e2[j].EntityId)
+                            {
+                                entityQueue.Enqueue(new EntityAggregate(e1[i], e2[j]));
+                            }
+                        }
+                    }
+                }
+            }
+            return entityQueue.ToArray();
+        }
+    }
+}

Task/Task/Task.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>