40 lines
872 B
Markdown
40 lines
872 B
Markdown
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---
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title: Do while loop
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localeTitle: 做循环
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---
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# 做循环
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`do while`循环执行一次代码块，直到条件为假。它们是[`while`循环的](https://guide.freecodecamp.org/csharp/while-loop)一个特例：它们执行一次代码块，然后直到条件为假。 `do while`循环的常见用法是输入检查。
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## 例
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```
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do
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{
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//execute code block
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} while(boolean expression);
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string input = "";
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do
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{
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Console.WriteLine("Type A to continue: ");
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input = Console.ReadLine();
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} while(input != "A");
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Console.WriteLine("Bye!");
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```
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## 输出：
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```
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> Type A to continue: b
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> Type A to continue: g
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> Type A to continue: A
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> Bye!
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```
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#### 更多信息：
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* [微软C＃ - 做](https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/do)
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* [Dot Net Perls - 做](https://www.dotnetperls.com/do)
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