C#“或”运算符？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/1746302/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
C# 'or' operator?
提问by Jarred Sumner
Is there an oroperator in C#?
orC#中有运算符吗？
I want to do:
我想要做：
if (ActionsLogWriter.Close or ErrorDumpWriter.Close == true)
{
// Do stuff here
}
But I'm not sure how I could do something like that.
但我不确定我怎么能做这样的事情。
采纳答案by Jeff Sternal
C# supports two boolean oroperators: the single bar |and the double-bar ||.
C# 支持两个布尔or运算符： single bar|和 double-bar ||。
The difference is that |always checks both the left and right conditions, while ||only checks the right-side condition if it's necessary (if the left side evaluates to false).
不同之处在于|始终检查左侧和右侧条件，而||仅在必要时检查右侧条件（如果左侧评估为假）。
This is significant when the condition on the right-side involves processing or results in side effects. (For example, if your ErrorDumpWriter.Closemethod took a while to complete or changed something's state.)
当右侧的条件涉及处理或导致副作用时，这很重要。（例如，如果您的ErrorDumpWriter.Close方法需要一段时间才能完成或更改某些状态。）
回答by Dave Barker
if (ActionsLogWriter.Close || ErrorDumpWriter.Close == true)
{ // Do stuff here
}
回答by Jeff Paquette
just like in C and C++, the boolean or operator is ||
就像在 C 和 C++ 中一样，布尔或运算符是 ||
if (ActionsLogWriter.Close || ErrorDumpWriter.Close == true)
{
// Do stuff here
}
回答by Josh
Also worth mentioning, in C# the OR operator is short-circuiting. In your example, Close seems to be a property, but if it were a method, it's worth noting that:
还值得一提的是，在 C# 中，OR 运算符是短路的。在您的示例中， Close 似乎是一个属性，但如果它是一个方法，则值得注意的是：
if (ActionsLogWriter.Close() || ErrorDumpWriter.Close())
is fundamentally different from
根本不同于
if (ErrorDumpWriter.Close() || ActionsLogWriter.Close())
In C#, if the first expression returns true, the second expression will not be evaluated at all. Just be aware of this. It actually works to your advantage most of the time.
在 C# 中，如果第一个表达式返回 true，则根本不会计算第二个表达式。请注意这一点。大多数时候它实际上对你有利。
回答by wls223
The single " | " operator will evaluate both sides of the expression.
单个“|”运算符将计算表达式的两边。
if (ActionsLogWriter.Close | ErrorDumpWriter.Close == true)
{
// Do stuff here
}
The double operator " || " will only evaluate the left side if the expression returns true.
double 运算符“ || ”将仅在表达式返回 true 时评估左侧。
if (ActionsLogWriter.Close || ErrorDumpWriter.Close == true)
{
// Do stuff here
}
C# has many similarities to C++ but their still are differences between the two languages ;)
C# 与 C++ 有很多相似之处，但它们仍然是两种语言之间的差异；)
