问号和语句中的冒号.这是什么意思? [英] Question mark and colon in statement. What does it mean?

问题描述

问号(?)和冒号(:)是什么意思?

What do the question mark (?) and colon (:) mean?

((OperationURL[1] == "GET") ? GetRequestSignature() : "")

它出现在以下语句中:

string requestUri = _apiURL + "?e=" + OperationURL[0] + ((OperationURL[1] == "GET") ? GetRequestSignature() : "");

推荐答案

这是条件运算符表达式.

This is the conditional operator expression.

(condition) ? [true path] : [false path];

例如

 string value = someBooleanExpression ? "Alpha" : "Beta";

因此，如果布尔表达式为true，则value将保留"Alpha"，否则将保留"Beta".

So if the boolean expression is true, value will hold "Alpha", otherwise, it holds "Beta".

要了解人们经常遇到的陷阱，请参阅此问题在 C#标签Wiki 中.

For a common pitfall that people fall into, see this question in the C# tag wiki.

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