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BillWagnerBillWagner
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Create C# 7 exploration (#5)
* checkpoint. Roughly half way done updating this exploration. * test for CI build * Getting more of the tutorials ready. * final review * remove debugging statement in build
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‎.gitignore

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# User-specific files (MonoDevelop/Xamarin Studio)
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*.userprefs
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# VS Code folder:
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**/.vscode/
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# Mono auto generated files
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mono_crash.*
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# binlog files for dotnet-try
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**/*.binlog
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NuGet.config

‎csharp7/ExploreCsharpSeven/ExploreCsharpSeven.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>netcoreapp3.0</TargetFramework>
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<LangVersion>8.0</LangVersion>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="System.CommandLine.DragonFruit" Version="0.2.0-alpha.19174.3" />
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</ItemGroup>
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</Project>

‎csharp7/ExploreCsharpSeven/GenericConstraints.cs

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using System;
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using System.Collections.Generic;
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namespace ExploreCsharpSeven
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{
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public static class GenericConstraints
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{
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#region DeclareEnumConstraint
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public static Dictionary<int, string> EnumNamedValues<T>() where T : System.Enum
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{
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var result = new Dictionary<int, string>();
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var values = Enum.GetValues(typeof(T));
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foreach (int item in values)
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result.Add(item, Enum.GetName(typeof(T), item));
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return result;
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}
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#endregion
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#region DeclareEnum
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enum Rainbow
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{
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Red,
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Orange,
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Yellow,
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Green,
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Blue,
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Indigo,
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Violet
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}
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#endregion
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public static int TestEnumNamedValues()
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{
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#region TestMapEnumValues
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var map = EnumNamedValues<Rainbow>();
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foreach (var pair in map)
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Console.WriteLine($"{pair.Key}:\t{pair.Value}");
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#endregion
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return 0;
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}
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}
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}

‎csharp7/ExploreCsharpSeven/GenericPatterns.cs

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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace ExploreCsharpSeven
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{
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static class GenericPatterns
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{
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#region GenericSwitchTypePattern
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public static void TestType(object obj)
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{
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switch (obj)
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{
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case 5:
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Console.WriteLine("The object is 5");
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break;
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case int i:
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Console.WriteLine($"The object is an integer: {i}");
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break;
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case null:
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Console.WriteLine($"The object is null");
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break;
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case long l:
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Console.WriteLine($"The object is a long: {l}");
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break;
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case double d:
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Console.WriteLine($"The object is a double: {d}");
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break;
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case string s when s.StartsWith("This"):
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Console.WriteLine($"This was a string that started with the word 'This': {s}");
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break;
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case string s when s.StartsWith("This"):
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Console.WriteLine($"This was a string that started with the word 'This': {s}");
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break;
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case string s:
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Console.WriteLine($"The object is a string: {s}");
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break;
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default:
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Console.WriteLine($"The object is some other type");
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break;
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}
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}
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#endregion
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public static int CallTestType()
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{
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#region GenericTestTypeWithSwitch
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TestType(5);
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long longValue = 12;
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TestType(longValue);
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int? answer = 42;
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TestType(answer);
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double pi = 3.14;
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TestType(pi);
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string sum = "12";
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TestType(sum);
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answer = null;
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TestType(answer);
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string message = "This is a longer message";
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TestType(message);
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#endregion
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return 0;
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}
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}
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}

‎csharp7/ExploreCsharpSeven/InReadonly.cs

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using System;
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namespace ExploreCsharpSeven
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{
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static class InReadonly
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{
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#region PointStructure
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public struct Point3D
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{
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private static Point3D origin = new Point3D(0, 0, 0);
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public static Point3D Origin => origin;
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public double X { get; }
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public double Y { get; }
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public double Z { get; }
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private double? distance;
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public Point3D(double x, double y, double z)
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{
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X = x;
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Y = y;
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Z = z;
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distance = null;
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}
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public double ComputeDistance()
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{
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if (!distance.HasValue)
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distance = Math.Sqrt(X * X + Y * Y + Z * Z);
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return distance.Value;
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}
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public static Point3D Translate(in Point3D source, double dX, double dY, double dZ) =>
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new Point3D(source.X + dX, source.Y + dY, source.Z + dZ);
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public override string ToString()
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=> $"({X}, {Y}, {Z})";
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}
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#endregion
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public static int ModifyTheOrigin()
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{
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#region UsePointstructure
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var start = Point3D.Origin;
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Console.WriteLine($"Start at the origin: {start}");
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// Move the start:
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start = Point3D.Translate(in start, 5, 5, 5);
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Console.WriteLine($"Translate by (5,5,5): {start}");
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Console.WriteLine($"Check the origin again: {Point3D.Origin}");
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#endregion
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return 0;
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}
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}
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}

‎csharp7/ExploreCsharpSeven/IsExpressions.cs

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using System;
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namespace ExploreCsharpSeven
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{
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static class IsExpressions
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{
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public static int ExploreIsPattern()
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{
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#region IsTypePattern
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object count = 5;
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if (count is int number)
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Console.WriteLine(number);
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else
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Console.WriteLine($"{count} is not an integer");
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#endregion
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return 0;
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}
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}
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}

‎csharp7/ExploreCsharpSeven/LocalFunctions.cs

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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace ExploreCsharpSeven
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{
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class LocalFunctions
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{
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#region LocalFunctionFactorial
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public static int CalculateFactorial(int n)
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{
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return nthFactorial(n);
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int nthFactorial(int number) => (number < 2) ?
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1 : number * nthFactorial(number - 1);
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}
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#endregion
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public static int TestLocalFactorial()
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{
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#region LocalFunctionFactorialTest
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Console.WriteLine(CalculateFactorial(6));
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#endregion
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return 0;
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}
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#region LocalFuntionIteratorMethod
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static IEnumerable<char> AlphabetSubset(char start, char end)
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{
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if (start < 'a' || start > 'z')
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throw new ArgumentOutOfRangeException(paramName: nameof(start), message: "start must be a letter");
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if (end < 'a' || end > 'z')
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throw new ArgumentOutOfRangeException(paramName: nameof(end), message: "end must be a letter");
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if (end <= start)
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throw new ArgumentException($"{nameof(end)} must be greater than {nameof(start)}");
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for (var c = start; c < end; c++)
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yield return c;
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}
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#endregion
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#region LocalFunctionIteratorWithLocal
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static IEnumerable<char> AlphabetSubsetLocal(char start, char end)
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{
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if (start < 'a' || start > 'z')
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throw new ArgumentOutOfRangeException(paramName: nameof(start), message: "start must be a letter");
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if (end < 'a' || end > 'z')
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throw new ArgumentOutOfRangeException(paramName: nameof(end), message: "end must be a letter");
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if (end <= start)
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throw new ArgumentException($"{nameof(end)} must be greater than {nameof(start)}");
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return alphabetSubsetImplementation();
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IEnumerable<char> alphabetSubsetImplementation()
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{
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for (var c = start; c < end; c++)
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yield return c;
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}
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}
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#endregion
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public static int TestSubset()
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{
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#region LocalFunctionsIteratorTest
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try
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{
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var resultSet1 = AlphabetSubset('d', 'r');
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var resultSet2 = AlphabetSubset('f', 'a');
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Console.WriteLine("iterators created");
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foreach (var thing1 in resultSet1)
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Console.Write($"{thing1}, ");
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Console.WriteLine();
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foreach (var thing2 in resultSet2)
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Console.Write($"{thing2}, ");
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Console.WriteLine();
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}
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catch (ArgumentException)
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{
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Console.WriteLine("Caught an argument exception");
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}
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return 1;
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#endregion
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}
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}
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}

‎csharp7/ExploreCsharpSeven/OutVariableDeclarations.cs

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using System;
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using System.Linq;
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namespace ExploreCsharpSeven
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{
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static class OutVariableDeclarations
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{
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public static int DeclareAtUse()
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{
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#region OutVariableDeclarations
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var input = "1234";
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if (int.TryParse(input, out int result))
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Console.WriteLine(result);
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else
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Console.WriteLine("Could not parse input");
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#endregion
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return 0;
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}
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public static int ExploreScope()
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{
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#region OutVariableDeclarationScope
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var input = "1234";
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if (!int.TryParse(input, out int result))
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{
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Console.WriteLine("Could not parse input");
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return 1;
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}
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Console.WriteLine(result);
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#endregion
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return 0;
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}
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public static int OutVarQuery()
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{
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#region DeclareOutQueryVariable
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string[] input = { "1", "2", "3", "4", "five", "6", "7" };
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var numbers = from s in input
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select (success: int.TryParse(s, out int result), result);
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foreach (var item in numbers)
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Console.WriteLine($"{(item.success ? "Success result is: " : "Failed to parse")}\t{(item.success ? item.result.ToString() : string.Empty)}");
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#endregion
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return 0;
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}
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}
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}

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