C# - 自动属性和返回支持字段之间的区别？

发布于 2024-10-10 03:47:56 字数 307 浏览 8 评论 0原文

我想象的简单问题，但是这些代码行之间有什么区别：

代码 1

public int Temp { get; set; }

和

代码 2

private int temp;
public int Temp { get { return temp; } }

我的理解是，代码 1 的自动属性将执行与代码 2 完全相同的功能？

我正在阅读 Head First C#，我发现很难理解为什么它使用两种不同的方式来做同一件事？

原文

Simple question I imagine, but what is the difference between these lines of code:

Code 1

public int Temp { get; set; }

and

Code 2

private int temp;
public int Temp { get { return temp; } }

My understand was that an automatic property as per Code 1 would perform the exact same function as Code 2?

I'm reading Head First C# and I'm finding it hard to understand why it's using two different ways of doing the same thing?

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薄荷→糖丶微凉 2024-10-17 03:47:56

Code1 和 Code2 之间的主要区别在于，在 #1 中，该属性是可设置的。

您可以使用自动属性实现相同的目标，因为 setter 可以是私有的：

public int Temp { get; private set; }

自动属性是在 C#3 中添加的，实际上只是使用字段的较长版本的语法糖。如果您不需要直接访问该字段，则没有理由不使用自动属性。自动属性相当于使用字段 - 编译器为您生成字段，只是在代码中无法访问它。

The primary difference between your Code1 and Code2 is that in #1, the property is settable.

You can achieve the same thing using automatic properties, because the setter can be private:

public int Temp { get; private set; }

Automatic properties was added in C#3, and is really just syntactic sugar for the longer version using a field. If you don't need to access the field directly, there is no reason not to use automatic properties. Automatic properties are equivalent to using a field - the compiler generates the field for you, it is just not accessible in code.

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情深缘浅 2024-10-17 03:47:56

“automagic”属性只是一个“简写”符号：

public int Temp { get; set; }

只是输入简单得多，

public int Temp 
{   
   get { return _temp; }
   set { _temp = value; } 
}

但功能相同。只是一个很好的“速记”来提高您的工作效率，但实际上没有额外或神奇的功能。

The "automagic" property is just a "short-hand" notation:

public int Temp { get; set; }

is just a lot simpler to type than

public int Temp 
{   
   get { return _temp; }
   set { _temp = value; } 
}

but functionally equivalent. Just a nice "shorthand" to improve your productivity, but no additional or magic functionality, really.

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鹿童谣 2024-10-17 03:47:56

第一个是可写属性。

它相当于

private int temp;
public int Temp { 
    get { return temp; } 
    set { temp = value; }
}

（除了不能直接使用 backingfield），但它需要 1 行代码而不是 5 行。
当编写具有 5 或 6 个简单属性的类时，自动属性可以使类变得更短。

您可以通过编写来创建只读自动属性

public int Temp { get; }

The first one is a writable property.

It's equivalent to

private int temp;
public int Temp { 
    get { return temp; } 
    set { temp = value; }
}

(except that you can't use the backingfield directly), but it requires 1 line of code instead of five.
When writing classes with 5 or 6 simple properties, auto-properties can make the classes much shorter.

You can make read-only auto-properties by writing

public int Temp { get; }

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殤城〤 2024-10-17 03:47:56

如果您的第二个示例同时具有 getter 和 setter，那么它们在功能上是等效的。

就目前情况而言，第一个可以公开获取，但不能公开设置。您还可以使用自动属性实现相同的目标：

public int Temp { get; private set; }

如果您好奇，自动属性仍然可以获得支持的私有字段。这部分只是由编译器为您处理，这样生活就更容易了。

If your second example had both a getter and a setter, they would be functionally equivalent.

As it stands now, the first is publicly gett-able but can't be set publicly. You could also achieve the same thing using auto properties:

public int Temp { get; private set; }

And in case you're curious, automatic properties still get a backing private field. That bit is just handled by the compiler for you so that life is easier.

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