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is 运算符是 C# 中用于类型检查和模式匹配的重要工具。它允许你在运行时检查一个对象是否与特定的类型兼容，或者是否符合某种特定的模式。

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在 C# 编程中，`throw` 关键字用于显式地引发异常。它不仅用于报告错误，还在控制程序流程和异常传播中扮演关键角色。

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最基本的形式是抛出一个继承自 `System.Exception` 的对象实例。</description>
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