当使用get和set在C＃中的属性 [英] When to use get and set properties in C#

问题描述

当我们要在C＃中使用get和set属性？

When should we use get and set properties in C#?

推荐答案

据该的属性使用指南MSDN上的：

• 当构件是一个逻辑数据成员使用的属性。在下面的成员声明，​​名称是一个属性，因为它是类的逻辑成员

• Use a property when the member is a logical data member. In the following member declarations, Name is a property because it is a logical member of the class.

使用的方法时：

• 的操作是转换，如 Object.ToString 。


• 操作是要传达给他们应考虑缓存结果用户够贵的。


• 获取使用get访问将有一个可观察到的副作用的属性值。


• 在连续调用两次成员会产生不同的结果。


• 执行的顺序是非常重要的。需要注意的是一个类型的属性应该是能够被设置和检索任何顺序。


• 成员是静态的，而是返回一个可以改变的值。


• 成员返回一个数组。返回数组的属性可以是非常误导的。通常有必要返回内部数组的副本，使得用户不能改变内部状态。此，加上一个事实，即用户可以容易地假设它是一个索引属性，导致低效的代码。在下面的代码示例中，每个调用方法属性创建数组的一个副本。其结果是，阵列的2n + 1个副本将在下面的循环中创建。

• The operation is a conversion, such as Object.ToString.
• The operation is expensive enough that you want to communicate to the user that they should consider caching the result.
• Obtaining a property value using the get accessor would have an observable side effect.
• Calling the member twice in succession produces different results.
• The order of execution is important. Note that a type's properties should be able to be set and retrieved in any order.
• The member is static but returns a value that can be changed.
• The member returns an array. Properties that return arrays can be very misleading. Usually it is necessary to return a copy of the internal array so that the user cannot change internal state. This, coupled with the fact that a user can easily assume it is an indexed property, leads to inefficient code. In the following code example, each call to the Methods property creates a copy of the array. As a result, 2n+1 copies of the array will be created in the following loop.

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