2023-06-02 09:00:01

{get;设置;}语法在c# ?

我正在学习ASP。NET MVC和我可以阅读英文文档,但我真的不明白这段代码中发生了什么:

public class Genre
{
    public string Name { get; set; }
}

这意味着什么:{get;设置;} ?


当前回答

它们是公共属性Name的访问器。

你可以使用它们在一个类型实例中获取/设置该属性的值。

其他回答

The get/set pattern provides a structure that allows logic to be added during the setting ('set') or retrieval ('get') of a property instance of an instantiated class, which can be useful when some instantiation logic is required for the property. A property can have a 'get' accessor only, which is done in order to make that property read-only When implementing a get/set pattern, an intermediate variable is used as a container into which a value can be placed and a value extracted. The intermediate variable is usually prefixed with an underscore. this intermediate variable is private in order to ensure that it can only be accessed via its get/set calls. See the answer from Brandon, as his answer demonstrates the most commonly used syntax conventions for implementing get/set.

这意味着,如果您创建类型为Genre的变量,您将能够将该变量作为属性访问

Genre oG = new Genre();
oG.Name = "Test";

它是c#的一个自动实现的属性。

基本上,它是一个快捷方式:

class Genre{
    private string genre;
    public string getGenre() {
        return this.genre;
    }
    public void setGenre(string theGenre) {
        this.genre = theGenre;
    }
}
//In Main method
genre g1 = new Genre();
g1.setGenre("Female");
g1.getGenre(); //Female

它基本上是一种速记。你可以写公共字符串Name {get;设置;}就像在许多例子中一样,但你也可以这样写:

private string _name;

public string Name
{
    get { return _name; }
    set { _name = value ; } // value is a special keyword here
}

为什么使用它?它可以用来过滤对属性的访问,例如您不希望名称中包含数字。

让我给你们举个例子:

private class Person {
    private int _age;  // Person._age = 25; will throw an error
    public int Age{
        get { return _age; }  // example: Console.WriteLine(Person.Age);
        set { 
            if ( value >= 0) {
                _age = value; }  // valid example: Person.Age = 25;
        }
    }
}

它的官方名称是Auto-Implemented Properties,阅读(编程指南)是一个好习惯。 我还推荐教程视频c#属性:为什么使用“get”和“set”。