我在Google上找不到任何答案,也许这是一个愚蠢的问题:)
It is getting a value indicating whether the page request is the result of a call back. Its a special postback, so a round-trip always occurs; however, unlike the classic postback, the script callback doesn't redraw the whole page. ViewState is not updated during a callback, it is for postback. IsPostBack is true when a method in the code behind posts a page
Gets a value that indicates whether the current postback is being executed in partial-rendering mode.
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