为什么要使用String.Format？[重复]

我可以看到许多原因：

可读性

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

vs：

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符的事实）

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

vs：

string s = "Invoice Number = " + ("0000" + _invoiceNum).Substr(..... )

字符串模板的持久性

如果我要将字符串模板存储在数据库中怎么办？使用字符串格式：

_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.