init

Creating a new project for something

HighScore.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Lab1
+{
+    internal class HighScore
+    {
+        public string Name { get; set; }
+        public int Trials { get; set; }
+    }
+}

Lab1.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Lab1.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.2.32602.215
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lab1", "Lab1.csproj", "{32FE7F03-E9ED-411A-9046-4E691EF040BA}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{32FE7F03-E9ED-411A-9046-4E691EF040BA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{32FE7F03-E9ED-411A-9046-4E691EF040BA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{32FE7F03-E9ED-411A-9046-4E691EF040BA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{32FE7F03-E9ED-411A-9046-4E691EF040BA}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {326F17E7-2CD2-4C6A-8484-8D0952D2FECE}
+	EndGlobalSection
+EndGlobal

Program.cs

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+using Lab1;
+using System.Text.Json;
+
+var rand = new Random();
+var value = rand.Next(1, 101);
+
+int guess;
+int trials = 0;
+do
+{
+    Console.Write("Wprowadź wartość: ");
+    guess = Convert.ToInt32(Console.ReadLine());
+
+    if (guess > value)
+        Console.WriteLine("Za dużo!");
+    else if (guess < value)
+        Console.WriteLine("Za mało!");
+
+    trials++;
+}
+while (guess != value);
+
+Console.WriteLine($"Wygrana w {trials} próbie!");
+Console.Write("Podaj swoje imię: ");
+var name = Console.ReadLine();
+
+var hs = new HighScore { Name = name, Trials = trials };
+
+List<HighScore> highScores = null;
+const string FileName = "highscores.json";
+if (File.Exists(FileName))
+    highScores = JsonSerializer.Deserialize<List<HighScore>>(File.ReadAllText(FileName));
+
+if (highScores == null)
+    highScores = new List<HighScore>();
+
+highScores.Add(hs);
+File.WriteAllText(FileName, JsonSerializer.Serialize(highScores));
+
+foreach (var item in highScores.OrderBy(x => x.Trials))
+{
+    Console.WriteLine($"{item.Name} -- {item.Trials} prób");
+}

highscores.json

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+[{"Name":"Test","Trials":11}]