Add project files.

wingman007 · Oct 5, 2019 · 72c8db8 · 72c8db8
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diff --git a/DotNetConf2019C8Part1.sln b/DotNetConf2019C8Part1.sln
@@ -0,0 +1,37 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29318.209
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DotNetConf2019C8Part1", "DotNetConf2019C8Part1\DotNetConf2019C8Part1.csproj", "{87EC18E8-D16A-481C-B4C8-12D380CF0746}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PersonStandardLibrary", "PersonStandardLibrary\PersonStandardLibrary.csproj", "{1D722957-FCF3-4051-A026-B6BD1794F364}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PersonCoreLibrary", "PersonCoreLibrary\PersonCoreLibrary.csproj", "{75796B95-8CC8-4B21-85AB-26D2C2A81902}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{87EC18E8-D16A-481C-B4C8-12D380CF0746}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{87EC18E8-D16A-481C-B4C8-12D380CF0746}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{87EC18E8-D16A-481C-B4C8-12D380CF0746}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{87EC18E8-D16A-481C-B4C8-12D380CF0746}.Release|Any CPU.Build.0 = Release|Any CPU
+		{1D722957-FCF3-4051-A026-B6BD1794F364}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1D722957-FCF3-4051-A026-B6BD1794F364}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1D722957-FCF3-4051-A026-B6BD1794F364}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1D722957-FCF3-4051-A026-B6BD1794F364}.Release|Any CPU.Build.0 = Release|Any CPU
+		{75796B95-8CC8-4B21-85AB-26D2C2A81902}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{75796B95-8CC8-4B21-85AB-26D2C2A81902}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{75796B95-8CC8-4B21-85AB-26D2C2A81902}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{75796B95-8CC8-4B21-85AB-26D2C2A81902}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {05AD5788-BACA-4174-B36F-EA8DFC585C18}
+	EndGlobalSection
+EndGlobal
diff --git a/DotNetConf2019C8Part1/DotNetConf2019C8Part1.csproj b/DotNetConf2019C8Part1/DotNetConf2019C8Part1.csproj
@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup> 
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <LangVersion>8.0</LangVersion>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\PersonCoreLibrary\PersonCoreLibrary.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/DotNetConf2019C8Part1/Program.cs b/DotNetConf2019C8Part1/Program.cs
@@ -0,0 +1,48 @@
+// https://www.youtube.com/watch?v=TJiLhRPgyq4
+// What's new in C# 8 - Part 1
+using System;
+class Program
+{
+    static void Main(string[] args)
+    {
+        var miguel = new Person("Miguel", "Angulo");
+        var length = GetMiddleNameLength(miguel);
+        Console.WriteLine(length);
+      }
+
+    static int GetMiddleNameLength(Person person) // Person person
+    {
+        //var middle = person.MiddleName;
+        //// if (middle == null) return 0; // to avoi the warning
+        //if (middle is null) return 0; // this works if you overwriten the equality == operator
+        //return middle.Length; //It is not null safe. if middle name = null you get an error
+
+        // return person.MiddleName.Length; // we get a warning it myt be null
+
+        // or
+        //return person.MiddleName?.Length ?? 0; // this is correct by construction you read the variable once
+
+        // if you think you know better
+        // use bank ! - null ignoring operator
+        // if (person.MiddleName is null) return 0;
+        // return person.MiddleName!.Length; // I know better
+
+        var middle = person.MiddleName;
+        if (string.IsNullOrEmpty(middle)) return 0;
+        return middle.Length;
+    }
+
+    //static int GetMiddleNameLength(Person? person)
+    //{
+    //    // 1
+    //    // { } is it an Object or is it something 
+    //    /*        if ((person?.MiddleName is { })) return person.MiddleName.Length;*/  // Alt + Enter or Ctrl + .
+    //                                                                                   // 2
+    //                                                                                   //if ((person?.MiddleName is { } middle)) return middle.Length;
+    //                                                                                   // 3
+    //                                                                                   //if ((person?.MiddleName is {Length: var length })) return length;
+    //                                                                                   //return 0;
+    //                                                                                   // and now only 1 line
+    //    return ((person?.MiddleName is { Length: var length })) ? length : 0;
+    //}
+}
diff --git a/PersonCoreLibrary/Person.cs b/PersonCoreLibrary/Person.cs
@@ -0,0 +1,26 @@
+// #nullable disable warnings
+// #nullable disable annotations
+// #nullable disable
+public class Person
+{
+    public string FirstName { get; set; }
+    public string? MiddleName { get; set; } // you have to make it nullable explicitly in C# 8.0
+    public string FamilyName { get; set; }
+
+    // if in the project file of this lib we have     <LangVersion>8.0</LangVersion> <Nullable>enable</Nullable> we get warning middleName is not assigned
+    public Person(string firstName, string familyName)
+    {
+        FirstName = firstName;
+        // we can solve the warnig like this
+        MiddleName = null; // but we get the warning Cannot convert null to non-nullable reference type. Strings are not null by default anymore. You have to make string nullable
+        FamilyName = familyName;
+    }
+
+#nullable disable
+    public Person(string firstName, string middleName, string familyName)
+    {
+        FirstName = firstName;
+        MiddleName = middleName;
+        FamilyName = familyName;
+    }
+}
diff --git a/PersonCoreLibrary/PersonCoreLibrary.csproj b/PersonCoreLibrary/PersonCoreLibrary.csproj
@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <LangVersion>8.0</LangVersion>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
diff --git a/PersonStandardLibrary/Person.cs b/PersonStandardLibrary/Person.cs
@@ -0,0 +1,21 @@
+public class Person
+{
+    public string FirstName { get; set; }
+    public string MiddleName { get; set; }
+    public string FamilyName { get; set; }
+
+
+    //// Severity	Code	Description	Project	File	Line	Suppression State
+    //Warning CS8618  Non-nullable property 'MiddleName' is uninitialized.Consider declaring the property as nullable.PersonStandardLibrary C:\Users\User\source\repos\DotNetConf2019C8Part1\PersonStandardLibrary\Person.cs	7	Active
+    public Person(string firstName, string familyName)
+    {
+        FirstName = firstName;
+        FamilyName = familyName;
+    }
+    public Person(string firstName, string middleName, string familyName)
+    {
+        FirstName = firstName;
+        MiddleName = middleName;
+        FamilyName = familyName;
+    }
+}
diff --git a/PersonStandardLibrary/PersonStandardLibrary.csproj b/PersonStandardLibrary/PersonStandardLibrary.csproj
@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <LangVersion>8.0</LangVersion><!-- Without this is not giving me warning -->
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>