是什么场和C＃中的属性之间的区别？ [英] What is the difference between a Field and a Property in C#?

问题描述

在C＃中，是什么让从属性的字段不同，什么时候应该字段用来代替属性？

In C#, what makes a field different from a property, and when should a field be used instead of a property?

推荐答案

属性暴露的字段。字段应该（总是）被保密的一类，并通过get和set属性进行访问。属性提供了一个抽象层，允许您更改领域，同时不影响它们被使用类的事情访问的外部方式。

Properties expose fields. Fields should (almost always) be kept private to a class and accessed via get and set properties. Properties provide a level of abstraction allowing you to change the fields while not affecting the external way they are accessed by the things that use your class.

public class MyClass
{
    // this is a field.  It is private to your class and stores the actual data.
    private string _myField;

    // this is a property.  When you access it uses the underlying field, but only exposes
    // the contract that will not be affected by the underlying field
    public string MyProperty
    {
        get
        {
            return _myField;
        }
        set
        {
            _myField = value;
        }
    }
}

@Kent指出属性不要求封装字段，它们可以做在其他领域的计算，或用于其他目的。

@Kent points out that Properties are not required to encapsulate fields, they could do a calculation on other fields, or serve other purposes.

@GSS指出，你也可以做其他的逻辑，如验证，当一个属性被访问时，另一个有用的功能。

@GSS points out that you can also do other logic, such as validation, when a property is accessed, another useful feature.

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