包阅导读总结
1. 关键词：C 13、新特征、索引操作符、.NET 9、代码示例
2. 总结：
本文介绍了 C 13 的一些新特性，包括更简洁指定 ESC 字符、使用“from the end”索引操作符 ^ ，并强调使用 C 13 需安装.NET 9 及相应的项目设置，这些新特性使编程更灵活，代码更易维护。
3. 主要内容：
– C 13 新特性
– 更简洁指定 ESC 字符：`char esc = ‘\e’;`
– 隐式“from the end”索引操作符 ^ 可用于对象初始化器
– 示例
– 定义 `InitializerDemo` 类，包含整数数组属性
– 展示使用索引操作符 ^ 的代码示例及输出结果
– 要求
– 需安装.NET 9 才能使用 C 13
– 现有项目使用 C 13 需设置 `TargetFramework` 为 `.net9.0`
– 建议
– 下载最新预览版 Visual Studio 2022 与.NET 9 探索新特性，提供更多学习链接
思维导图：
文章地址：https://www.infoworld.com/article/3477282/the-best-new-features-in-c-sharp-13.html
文章来源：infoworld.com
作者：InfoWorld
发布时间：2024/8/1 8:30
语言：英文
总字数：1664字
预计阅读时间：7分钟
评分：89分
标签：C# 13,.NET 9,编程语言,线程同步,性能优化
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With C# 13, you can specify the ESC character much more concisely as shown in the following code snippet:
char esc = '\e';
Implicit index access
With C# 13, the implicit “from the end” index operator ^ can now be used in object initializers. You can use ^ to specify a position in a collection that is relative to the end of the collection.
For example, consider the following class.
class InitializerDemo
{
public int[] integers { get; set; } = new int[5];
}
You can now use the following piece of code in C# 13 to take advantage of the index operator.
var arr = new InitializerDemo
{
integers =
{
[0] = 100,
[^1] = 1000
}
};
When you execute the above program, arr.Integers[0] will have the value 100 while arr.Integers[4] will have the value 1000. You can use the following line of code to display the values of the integer array at the console.
Console.WriteLine("The value of arr.Integers[0] is {0} and arr.Integers[4] is {1}", arr.Integers[0], arr.Integers[4]);
Figure 2 shows the output at the console when the code is executed.
Figure 2. The implicit “from the end” index operator ^ in action.
IDG
TargetFramework .NET 9
Note that you will need to have .NET 9 installed in your computer to work with C# 13. If you want to change your existing projects to use C# 13, you will need to set the TargetFramework to .NET 9 as shown in the code snippet given below.
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<LangVersion>preview</LangVersion>
<TargetFramework>net9.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>
The new features and enhancements in C# 13 outlined in this article will give you more flexibility and help you write cleaner, more maintainable C# code. To explore the new features of C# 13, you should download the latest preview of Visual Studio 2022 with .NET 9. You can learn more about the new features in C# 13 here and here.
