Microsoft introduce a new syntax in C#6 that let you set your property to read-only as below:
public class Animal
{
public string MostDangerous { get; } = "Mosquito";
}
I am wondering what is the added value of such approach.
What is the difference by just writing:
public class Animal
{
public const string MostDangerous = "Mosquito";
}
or even:
public class Animal
{
public string MostDangerous
{
get
{
return "Mosquito";
}
}
}
Your example is using string constants which can't show all the possibilities. Look at this snippet:
class Foo
{
public DateTime Created { get; } = DateTime.Now; // construction timestamp
public int X { get; }
public Foo(int n)
{
X = n; // writeable in constructor only
}
}
Read only properties are per-instance and can be set from the constructor. Very different from a const
field whose value must be determined at compile time. The property initializer is a separate feature and follows the rules and limitations of field initializers.
The newer syntax is an effort in reducing the verbosity of C#. It's just syntactic sugar. The IL generated is similar to an auto property with a getter and a backing store.
这种对 C# 的改进直接来自 VB,并且不需要实现支持字段和构造函数初始值设定项:
Public ReadOnly dateStamp As DateTime = Datetime.Now
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