类的默认属性 [英] Default Property Of A Class

问题描述

如果我为名为Foo的实例创建了一个Class.如何设置默认属性，例如:

Hi,

If I have created a Class for instance named Foo. How do I set a default property so for instance:

Foo f = new Foo();
f = "Test";

是否可以不必使用构造函数或不必...

Is it possible without having to use a constructor or having to...

f.Name = "Test"

如果存在，则需要设置一个属性，或者应该在Foo类中调用基础属性以实现此目的?

在此先感谢.

If it is is there an Attribute that needs to be set or what should the underlying Propery be called in the Foo Class for this to happen?

Thanks in advance.

推荐答案

看看对象初始化程序 [ ^ ].

如果Foo类包含一个名为Name的属性，则可以执行Foo f = new Foo{Name="Test"}

Have a look at object initializers[^].

If you class Foo contains a property called Name, you can do Foo f = new Foo{Name="Test"}

C#中没有此类功能.许多C#人员甚至不理解您的问题，因为他们可能不熟悉其他一些语言中所知道的这个概念.我会说不是很大的损失...

—SA

There is no such feature in C#. Many C# people would not even understand your question because they might be unfamiliar with this concepts know in some other languages. Not a very big loss, I would say…

—SA

尽管我不愿意这样做，因为它打破了一些简单的OOP规则，您可以使用隐式运算符:

Despite I wouldn''t do it, as it breaks some simple rule of OOP, you can use an implicit operator :

public class Foo
{
   public string Name { get; private set; }

   public static implicit operator Foo(string s)
   {
      return new Foo { Name = s };
   }
}

哪一个可以让你写:

Which would allow you to write :

Foo f = "some string";

但是，我还是不会这么做.

But, again, I wouldn''t do it.

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