在VB.net没有增量运算符 [英] No increment operator in VB.net

问题描述

我是相当新的vb.net和碰到这个问题，而在C＃转换for循环VB.net
我意识到，增量运营商都没有在vb.net（++和 - ）
，而我却能它像做 CNT + = 1

I am fairly new to vb.net and came across this issue while converting a for loop in C# to VB.net I realized that the increment operators are not available in vb.net (++ and --) whereas i was able it do something like cnt +=1

我研究了一下， 在同一Eric的帖子，但没有真正能够完全理解它。
他提到的在VB中，一个语句不能只是一个表情。不知道如何真正结合使用。

I researched a bit and came across Eric's post on the same, but wasn't really able to understand fully on it. He mentions of In VB, a STATEMENT cannot be just an EXPRESSION. not sure how that really fits in.

我希望有人在这里将能够解释为什么这并不以相同的方式工作，因为它在C＃一样。
（希望这也将举行真正在我们为什么 == 在C＃中比较）

I hope someone here would be able to explain why this doesn't work in the same way as it does in C#. (Hope this will also hold true as in why we have == in C# for comparison)

推荐答案

我要说的是语言设计者简单地认为基本比℃，更好的基线设计时视觉BASIC 。您可以按照 C （和前面， BCPL ）通过 C ++ ，的Java 和 C＃。

I would say that the language designers simply thought that BASIC was a better baseline than C when designing Visual BASIC. You can follow the lineage of C (and, earlier, BCPL) through C++, Java and C#.

在 VB 血统来自于原来的基本达特茅斯（以及更早，的Fortran ），是一个不同的野兽完全。

The VB lineage comes from the original BASIC from Dartmouth (and, earlier, Fortran) and is a different beast altogether.

在换句话说，开始作为久负盛名的基本：

In other words, what started as the venerable BASIC:

LET I = I + 1

可能已经被黑客攻击并摧毁的足够的： - ）

has probably been hacked and destroyed enough :-)

根据Eric的帖子，我++; 确实只是产生 I 与 I <表达式一/ code>在事件发生后递增（我++; 是一个表达式，就像无副作用表达我; ）。

As per Eric's post, i++; is indeed just an expression, one that yields i with the side effect that i is incremented after the event (i++; is an expression, just like the non-side-effect expression i;).

这是因为 C 允许这些赤裸裸的表情，甚至东西像 42 这并没有真正做很多，但也完全有效。换句话说，下面是一个完整的 C 程序：

That's because C allows these naked expressions, even things like 42; which doesn't really do much but is perfectly valid. In other words, the following is a complete C program:

int main (void) { 1; 2; 3; 4; 5; 6; 7; 8; 9; return 0; }

所有这些表达式是有效的，但没有用。

All those expressions are valid but useless.

在基本，这是不是真的做了，因为基本组成的的语句的（事情做了）。这就是为什么 I + = 1 （增加声明我）被认为是犹太但我++ （一种表达什么都不做这恰好有一个副作用，这增加 I ）不是。你可以说，这只是语义吹毛求疵，毫无疑问的 VB 设计者们争辩。

In BASIC, this was not really done, because BASIC consisted of statements (things that did something). That's why i += 1 (a statement incrementing i) is considered kosher but i++ (an expression doing nothing which just happens to have a side effect which increments i) isn't. You could argue that it's just semantic hair-splitting and no doubt the VB designers did argue.

但该集团赢得了当天的都是我们不需要任何讨厌的 C 在我们敬爱的语言组。

But the group that won the day were the "we don't need no stinkin' C in our beloved language" group.

你应该感谢小怜悯，至少你不必应付COBOL：

You should be thankful for small mercies, at least you're not having to deal with COBOL:

ADD 1 TO DD_WS_I.

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