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81 lines
1.6 KiB
Plaintext
81 lines
1.6 KiB
Plaintext
#!markdown
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# Chapter 7 - Packaging and Distributing .NET Types
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Most of this chapter is about creating apps and class libraries for deployment so .NET Interactive notebooks cannot be used for most code examples.
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#!markdown
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## Importing a namespace to use a type
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#!csharp
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using System.Xml.Linq; // XDocument
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#!csharp
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XDocument doc = new();
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#!markdown
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## Relating C# keywords to .NET types
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One of the common questions I get from new C# programmers is, "What is the difference
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between `string` with a lowercase s and `String` with an uppercase S?"
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#!csharp
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using System; // String
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#!csharp
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string s1 = "Hello";
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String s2 = "World";
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#!markdown
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## Understanding native-sized integers
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C# 9 introduced `nint` and `nuint` keyword alias for native-sized integers, meaning that the
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storage size for the integer value is platform specific.
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#!csharp
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using static System.Console;
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#!csharp
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WriteLine($"int.MaxValue = {int.MaxValue:N0}");
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WriteLine($"nint.MaxValue = {nint.MaxValue:N0}");
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#!markdown
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## Testing your class library package
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#!csharp
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#r "nuget:packt.csdotnet.sharedlibrary,6.0.0"
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#!csharp
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using Packt.Shared;
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#!csharp
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#nullable enable
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Write("Enter a color value in hex: ");
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string? hex = "00ffc8"; // or ReadLine();
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WriteLine("Is {0} a valid color value? {1}",
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arg0: hex, arg1: hex.IsValidHex());
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Write("Enter a XML element: ");
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string? xmlTag = "<h1 class=\"<\" />"; // or ReadLine()
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WriteLine("Is {0} a valid XML element? {1}",
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arg0: xmlTag, arg1: xmlTag.IsValidXmlTag());
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Write("Enter a password: ");
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string? password = "secretsauce"; // or ReadLine()
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WriteLine("Is {0} a valid password? {1}",
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arg0: password, arg1: password.IsValidPassword());
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