is 和 as 关键字的区别 [英] Difference between is and as keyword

问题描述

请说出C#中is和as关键字的区别

Please tell what is the difference between is and as keyword in C#

推荐答案

is

is 运算符检查是否可以将对象强制转换为特定类型.

is

The is operator checks if an object can be cast to a specific type.

示例:

if (someObject is StringBuilder) ...

作为

as 运算符试图将对象强制转换为特定类型，如果失败则返回 null.

as

The as operator attempts to cast an object to a specific type, and returns null if it fails.

示例:

StringBuilder b = someObject as StringBuilder;
if (b != null) ...

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还相关:

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Also related:

强制转换运算符尝试将对象强制转换为特定类型, 并在失败时抛出异常.

The cast operator attempts to cast an object to a specific type, and throws an exeption if it fails.

示例:

StringBuilder b = (StringBuilder)someObject.

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