为什么我用C#写这个:
for(int myVar = 0; myVar<10; myVar++) { //do something here } //then,if I try: int myVar = 8; //I get some error that the variable is already declared. //but if I try: Console.WriteLine(myVar); //then I get the error that the variable is not declared.
我最常说的有点混乱.有谁知道为什么C#编译器会这样做?
解决方法
该规则以及其他几个相关规则将在
this blog post of Eric Lippert’s中讨论.
这里违反的特定规则是:
2) It is illegal to have two local variables of the same name in the same local variable declaration space or nested local variable declaration spaces.
特别值得注意的是,关于规则存在的原因如下:
the purpose of all of these rules is to prevent the class of bugs in which the reader/maintainer of the code is tricked into believing they are referring to one entity with a simple name,but are in fact accidentally referring to another entity entirely. These rules are in particular designed to prevent nasty surprises when performing what ought to be safe refactorings.