为什么我们不使用新的运营商在初始化字符串？ [英] Why don't we use new operator while initializing a string?

问题描述

有人问我这个问题，在接受采访时：字符串是引用类型或值类型。

I was asked this question in an interview: Is string a reference type or a value type.

我说的引用类型。然后他问我，为什么我们不使用新的运营商在初始化字符串？我说，因为C＃语言有一个简单的语法来创建一个字符串，编译器会自动转换code到呼吁System.String类的construcor。

I said its a reference type. Then he asked me why don't we use new operator while initializing the string ? I said because the c# language has a simpler syntax for creating a string and the compiler automatically converts the code into a call for the construcor of the System.String class.

这是答案正确与否？

推荐答案

字符串是不可变的引用类型。还有的 ldstr IL指令，允许推一个新的对象引用字符串。所以，当你写的：

Strings are immutable reference types. There's the ldstr IL instruction which allows pushing a new object reference to a string literal. So when you write:

string a = "abc";

编译器的测试，如果ABC文字已在元数据中定义，如果没有申报。然后将这种code到以下IL指令：

The compiler tests if the "abc" literal has already been defined in the metadata and if not declare it. Then it translates this code into the following IL instruction:

ldstr "abc"

这基本上使 A 局部变量指向字符串中的元数据定义。

Which basically makes the a local variable point to the string literal defined in the metadata.

所以，我要说的是，你的答案是不一样的编译器不把它理解调用构造函数完全正确。

So I would say that your answer is not quite right as the compiler doesn't translate this into a call to a constructor.

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