Question

我有以下而声明 -

while ((!testString.Contains("hello")) && (NewCount != OldCount) && (attemptCount < 100))
{
    //do stuff (steps out too early)
}

即使所有条件都没有得到满足，这也会逐步退出声明。

我试图像 -

那样减少它

while (!testString.Contains("hello"))
{
    // this works and steps out when it should
}

例如，当hello存在时，这会逐步消失。我也尝试将其更改为 OR 语句，该语句将问题转移为永不执行语句。

Addint && (NewCount != OldCount) && (attemptCount < 100))条件导致此行为如何解决此问题？

Answer 1

即使在所有条件下，这也是出于声明没有得到满足。

要实现这一点，您需要指定逻辑OR（||）。例如：

while ((!testString.Contains("hello")) || (NewCount != OldCount) || (attemptCount < 100))
{
    //while at least one those conditions is true, loop will work
}

这意味着内部循环需要引入安全检查，需要，条件不是更真实，而循环仍在执行。

Answer 2

作为Tigran答案的补充。通常（为了避免混淆复杂条件）将条件推入循环可能是有用的：

  while (true) { // loop forever unless:
    if (testString.Contains("hello")) // ...test string contains "hello"
      break;

    if (NewCount == OldCount) // ...counts are equal
      break;

    if (attemptCount >= 100) // ... too many attempts
      break;

    // ...it's easy to add conditions (as well as comment them out)  when you have them

    // Loop body
  }

虽然声明具有多种条件

2 个答案: