通常在页面指令中或通过重写属性设置此属性的值。

You typically set a value for this property in the page directive or by overriding the property.

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数据源属性重写了系统属性。

The data source property overrides the system property.

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然后，它将遍历重写规则，每次遍历一个，对于每个规则，它将获取规则的LookFor属性，并使用正则表达式来确定是否在被请求的URL中找到了匹配的规则。

It then iterates through the rewrite rules one at a time, and for each rule, it grabs its LookFor property and USES a regular expression to determine if a match is found in the requested URL.

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