一个直行映射，即一个XPath表达式的集合，它找出形成表格每列的模型对象的属性。
A column mapping that is a set of XPath expressions, which find attributes of those model objects, forming the columns of the table.
获取一个表示表格中所有列标题的UI自动化提供程序的集合。
Gets a collection of UI Automation providers that represents all the column headers in a table.
获取一个表示表格中所有列标题的UI自动化提供程序的集合。
Gets a collection of UI Automation providers that represents all the column headers in a table.
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