需要注意,非 record 类型的 primary constructor 和 record 类型的 primary constructor 并不相同,差别较大,对于 record 类型来说会生成属性而不是字段,这一点区别很大,而且目前来说字段是私有的,不能被外部类型直接引用,其次 record 类型会生成 deconstructor 和自定义的相等性比较等
Primary constructors are a new feature in C# 12 that allows you to declare and use constructor parameters anywhere in the body of a class or a struct. They are a concise way to initialize properties or fields, call base constructors, or reference the parameters in other members of the ...
https://github.com/WeihanLi/SamplesInPractice/blob/main/CSharp12Sample/PrimaryConstructorSample.cs
Primary constructors put the parameters of one constructor in scope for the whole class or struct to be used for initialization or directly as object state. The trade-off is that any other constructors must call through the primary constructor.
What about multiple constructors? Yes, you can have multiple constructors! You can have multiple constructors with different parameters. Specifying an addtional constructor, finally the primary constructor needs to be invoked as shown in the following code snippet: ...
With C# 12, primary constructors enable constructor parameters to be declared right in the class or struct declaration line. Conventional constructors require you to declare a constructor method directly, set properties inside of it, and frequently write extra lines of code for every property. This...
Learn how and when to declare primary constructors in your class and struct types. Primary constructors provide concise syntax to declare constructor parameters available anywhere in your type.
Primary constructors are considered an “Everyday C#” developer feature. They allow you to define a class or struct along with its constructor in a single concise declaration. This can help you reduce the amount of boilerplate code you need to write. If you’ve been following along with C#...
Now, let’s utilize a primary constructor for the same class: publicclassDoctor(stringname, List<string>patients) { publicstringName{get;set;}= name; publicboolIsOverworked =>patients.Count>=5; publicDoctor(stringname) :this(name,newList<string>()) ...
Primary constructors in C# 12 can be used in classes and structs as well as record types. Here’s how they make your code cleaner and more concise. One of the striking new features inC# 12is the support for primary constructors. The concept of primary constructors is not new. Several ...