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csharpfritzcsharpfritz
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0402 (#77)
* Initial demos * After demo
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‎sessions/Season-04/0402-Nullability/0402-Nullability.sln

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 16
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VisualStudioVersion = 16.6.30114.105
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "sample", "sample\sample.csproj", "{54997B90-2AA1-4ACD-92EE-E5C33BE163AA}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Debug|x64 = Debug|x64
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Debug|x86 = Debug|x86
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Release|Any CPU = Release|Any CPU
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Release|x64 = Release|x64
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Release|x86 = Release|x86
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{54997B90-2AA1-4ACD-92EE-E5C33BE163AA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{54997B90-2AA1-4ACD-92EE-E5C33BE163AA}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{54997B90-2AA1-4ACD-92EE-E5C33BE163AA}.Debug|x64.ActiveCfg = Debug|Any CPU
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{54997B90-2AA1-4ACD-92EE-E5C33BE163AA}.Debug|x64.Build.0 = Debug|Any CPU
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{54997B90-2AA1-4ACD-92EE-E5C33BE163AA}.Debug|x86.ActiveCfg = Debug|Any CPU
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{54997B90-2AA1-4ACD-92EE-E5C33BE163AA}.Debug|x86.Build.0 = Debug|Any CPU
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{54997B90-2AA1-4ACD-92EE-E5C33BE163AA}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{54997B90-2AA1-4ACD-92EE-E5C33BE163AA}.Release|Any CPU.Build.0 = Release|Any CPU
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{54997B90-2AA1-4ACD-92EE-E5C33BE163AA}.Release|x64.ActiveCfg = Release|Any CPU
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{54997B90-2AA1-4ACD-92EE-E5C33BE163AA}.Release|x64.Build.0 = Release|Any CPU
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{54997B90-2AA1-4ACD-92EE-E5C33BE163AA}.Release|x86.ActiveCfg = Release|Any CPU
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{54997B90-2AA1-4ACD-92EE-E5C33BE163AA}.Release|x86.Build.0 = Release|Any CPU
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EndGlobalSection
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EndGlobal

‎sessions/Season-04/0402-Nullability/sample/1-ValueTypes.cs

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using System;
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namespace sample {
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public class ValueTypes {
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public static void Defaults() {
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int? i = null; //default(int);
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Console.WriteLine($"Default {i?.GetType().Name}: {i + 100}");
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}
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public static void Arrays() {
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var values = new string[3];
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string firstValue = values[0];
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Console.WriteLine(firstValue.ToLower());
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}
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}
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}

‎sessions/Season-04/0402-Nullability/sample/2-ReferenceTypes.cs

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using System;
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namespace sample
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{
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// #nullable enable
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public static class ReferenceTypes {
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public static void SimpleNull() {
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Hat myHat = new Hat();
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Console.WriteLine($"MyHat is a: {myHat.GetType().Name} and {myHat}");
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}
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public static void Property() {
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var myHat = new Hat();
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Console.WriteLine($"MyHat's name is {myHat.AcquiredYear.GetType().Name}: {myHat.AcquiredYear.ToString()}");
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}
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public static void NullForgiving() {
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var myHat = Find();
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Console.WriteLine($"myHat is named {myHat!.Name}");
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}
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private static Hat Find() {
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return new Hat();
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}
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}
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// #nullable restore
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}

‎sessions/Season-04/0402-Nullability/sample/Hat.cs

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using System.ComponentModel.DataAnnotations;
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namespace sample
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{
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// #nullable enable
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public class Hat {
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[Required]
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public string Name { get; set; } = string.Empty;
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public int AcquiredYear { get; set; }
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public string Theme { get; set; } = string.Empty;
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}
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public class Foo
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{
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public static void Bar()
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{
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Hat? hat = new();
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//hat.Name = null;
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}
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}
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// #nullable restore
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public class Customer
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{
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public string TaxClassification { get; set; } = "Exempt";
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}
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}

‎sessions/Season-04/0402-Nullability/sample/Program.cs

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using System;
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namespace sample
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{
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class Program
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{
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static void Main(string[] args)
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{
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// ValueTypes.Defaults();
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// ValueTypes.Arrays();
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// ReferenceTypes.SimpleNull();
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//ReferenceTypes.Property();
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ReferenceTypes.NullForgiving();
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}
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}
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}

‎sessions/Season-04/0402-Nullability/sample/sample.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>net5.0</TargetFramework>
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<Nullable>enable</Nullable>
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<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
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</PropertyGroup>
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</Project>

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