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Previews
Preliminary drafts of C# 11 and .NET 7 - Modern Cross-Platform Development were written and tested with .NET 7 Preview 1. Microsoft will release monthly previews until August, then two release candidates in September and October, before the general availablility (GA) release in November 2022. Each month I will add new content to this page that will then be added to the final drafts in September.
New content for .NET 7 Preview 2
Chapter 1 - Command Line Interface commands
In .NET 7 Preview 2 and later, dotnet commands do not need to be prefixed with hyphens.
For example, to list the currently installed templates before:
dotnet new --list
After:
dotnet new list
Since I want to ensure that .NET 6 developers can follow the examples in the book, and Microsoft will support the use of hyphenated commands for a while, the book will continue to use the hyphenated commands but with a note that they are optional in .NET 7 and later.
Chapter 8 - Regular Expressions
In .NET 7 Preview 2 and later, you can use a more efficient Regex source generator.
Before:
public class Foo
{
public Regex regex = new Regex(@"abc|def", RegexOptions.IgnoreCase);
public bool Bar(string input)
{
bool isMatch = regex.IsMatch(input);
// ..
}
}
After:
public partial class Foo // <-- Make the class a partial class
{
[RegexGenerator(@"abc|def", RegexOptions.IgnoreCase)] // <-- Add the RegexGenerator attribute and pass in your pattern and options
public static partial Regex MyRegex(); // <-- Declare the partial method, which will be implemented by the source generator
public bool Bar(string input)
{
bool isMatch = MyRegex().IsMatch(input); // <-- Use the generated engine by invoking the partial method.
// ..
}
}