当使用get;组;在c＃ [英] When to use get; set; in c#

问题描述

我没有理解上的差异是什么初始化变量，获取其值是这样的：

I'm failing to understand what the difference is between initializing a variable, getting its value like this:

 //define a local variable.
   int i;

   i= 0;
   Console.WriteLine(i);

和获取;组;用法：

and the get; set; usage:

public int i
{
   get;
   set;
}

i = 0;
Console.WriteLine(i);

我读过一些文章，但不明白的时候我都会使用它。

I've read some articles, but don't understand when I would use it.

推荐答案

基本上，在这种情况下，没有区别的使用属性的（多）的优点，被添加的能力<强>活动，以你的财产，像这样：

Basically, in that case, there is no difference, of the (many) advantages of using a property is the ability to add Events to your property, like so:

  public delegate void ChangedEventHandler(object sender, EventArgs e);

  int m_i = 0;
  public int i 
  {
      get { return m_i; }
      set { m_i = value; iChanged(self, null); }
  }

  public ChangedEventHandler iChanged;

这允许代码知道什么时候我已经改变（可能有一些语法错误，我的天堂T专注于C＃在一段时间，但这个想法是相似的）。这是的WinForms非常重要的，因为这是了解一个按钮（或类似）已被点击时的主要方式。

This allows for code to know when I has been changed (there might be some syntax errors, I haven't focused on C# in a while, but the idea is similar). This is extremely important in winforms, as this is the major way of knowing when a button (or similar) has been clicked.

此外，这允许附加功能中的属性，如：的设定部检查它是否在一定范围内，像这样的：

Also, this allows for additional functionality in the setter of a property, e.g. checking if it is in a certain range, like this:

  int m_i = 0;
  public int i {

  get { return m_i; }
  set { if (value > 10) throw new Exception("I cannot be greater than 10!"); m_i = value; }
  }

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