C#.Net 不区分大小写的字符串

C#.Net case-insensitive string

提问by GateKiller

Why does C#.Net allow the declaration of the string object to be case-insensitive?

为什么 C#.Net 允许字符串对象的声明不区分大小写？

String sHello = "Hello";
string sHello = "Hello";

Both the lower-case and upper-case S of the word String are acceptable and this seems to be the only object that allows this.

字符串的小写和大写 S 都是可以接受的，这似乎是唯一允许这样做的对象。

Can anyone explain why?

谁能解释为什么？

采纳答案by Keith

stringis a language keyword while System.Stringis the type it aliases.

string是一个语言关键字，而System.String是它的别名类型。

Both compile to exactly the same thing, similarly:

两者都编译为完全相同的东西，类似地：

• intis System.Int32
• longis System.Int64
• floatis System.Single
• doubleis System.Double
• charis System.Char
• byteis System.Byte
• shortis System.Int16
• ushortis System.UInt16
• uintis System.UInt32
• ulongis System.UInt64

• int是 System.Int32
• long是 System.Int64
• float是 System.Single
• double是 System.Double
• char是 System.Char
• byte是 System.Byte
• short是 System.Int16
• ushort是 System.UInt16
• uint是 System.UInt32
• ulong是 System.UInt64

I think in most cases this is about code legibility - all the basic system value types have aliases, I think the lower case stringmight just be for consistency.

我认为在大多数情况下这是关于代码易读性的——所有基本的系统值类型都有别名，我认为小写string可能只是为了一致性。

回答by lubos hasko

"String" is the name of the class. "string" is keyword that maps this class.

“字符串”是类的名称。“string”是映射此类的关键字。

it's the same like

它是一样的

• Int32 => int
• Decimal => decimal
• Int64 => long

• Int32 => int
• 十进制 => 十进制
• Int64 => 长

... and so on...

... 等等...

回答by ZombieSheep

string is an alias for System.String. They are the same thing.

string 是 System.String 的别名。他们是一样的东西。

By convention, though, objects of type (System.String) are generally refered to as the alias - e.g.

但是，按照惯例，类型 (System.String) 的对象通常被称为别名——例如

string myString = "Hello";

whereas operations on the class use the uppercase version e.g.

而对类的操作使用大写版本，例如

String.IsNullOrEmpty(myStringVariable);

回答by aku

"string" is a C# keyword. it's just an alias for "System.String" - one of the .NET BCL classes.

“字符串”是 C# 关键字。它只是“System.String”的别名——.NET BCL 类之一。

回答by Patrik Svensson

"string" is just an C# alias for the class "String" in the System-namespace.

“string”只是 System-namespace 中“String”类的 C# 别名。

回答by Iain Holder

Further to the other answers, it's good practice to use keywords if they exist.

除了其他答案之外，最好使用关键字（如果存在）。

E.g. you should use stringrather than System.String.

例如，您应该使用string而不是System.String。

回答by Brian Leahy

I use String and not string, Int32 instead of int, so that my syntax highlighting picks up on a string as a Type and not a keyword. I want keywords to jump out at me.

我使用 String 而不是 string，Int32 而不是 int，这样我的语法突出显示将字符串作为类型而不是关键字。我想让关键字跳出来。