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

问题描述

为什么有人会在 C# 和 VB .NET 中使用 String.Format 而不是连接运算符(VB 中的 & 和 +> 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#)?

主要区别是什么?为什么每个人都对使用 String.Format 如此感兴趣?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

我可以看到很多原因:

可读性

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

对比:

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

格式说明符(这包括您可以编写自定义格式化程序的事实)

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

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

对比:

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

字符串模板持久化

如果我想在数据库中存储字符串模板怎么办?使用字符串格式:

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.

对比:

_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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