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---
title: is
localeTitle: 是
## 是
`is`关键字检查对象是否与给定类型兼容，或者（从C＃7开始）针对模式测试表达式。
#### 更多信息：
* [C＃参考：是](https://docs.microsoft.com/dotnet/csharp/language-reference/keywords/is)