为什么要使用的String.Format？ [英] Why use String.Format?

问题描述

为什么会有人用的String.Format C＃和VB .NET相对于串联运算符（＆安培; VB的 + 在C＃中）？

Why would anyone use String.Format in C# and VB .NET as opposed to the concatenation operators (& in VB, and + in C#)?

主要的区别是什么？为什么大家如此热衷于使用的String.Format ？我很好奇。

What is the main difference? Why are everyone so interested in using String.Format? I am very curious.

推荐答案

我可以看到几个原因：

可读性

string s = string.Format("Hey, {0} it is the {1}st day of {2}.  I feel {3}!", _name, _day, _month, _feeling);

VS

string s = "Hey," + _name + " it is the " + _day + "st day of " + _month + ".  I feel " + feeling + "!";

格式说明
（这包括可以编写自定义格式的事实）

Format Specifiers (and this includes the fact you can write custom formatters)

string s = string.Format("Invoice number: {0:0000}", _invoiceNum);

VS

string s = "Invoice Number = " + ("0000" + _invoiceNum).Substr(..... /*can't even be bothered to type it*/)

字符串模板持久性

如果我想字符串模板存储在数据库中？与字符串格式化：

What if I want to store string templates in the database? With string formatting:

_id         _translation
  1         Welcome {0} to {1}.  Today is {2}.
  2         You have {0} products in your basket.
  3         Thank-you for your order.  Your {0} will arrive in {1} working days.

VS

_id         _translation
  1         Welcome
  2         to
  3         .  Today is
  4         . 
  5         You have
  6         products in your basket.
  7         Someone
  8         just shoot
  9         the developer.

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