Abstract
在.NET 1.x的DataGrid,可以在ItemCommand event的e.Item.ItemIndex獲得目前的RowIndex,但在.NET 2.0的GridView,卻無法使用這種方式在RowCommand event獲得RowIndex。
Motivation
為什麼需要在RowCommand event獲得RowIndex呢?通常一個Table的PK或FK並不會顯示在GridView上,而會設定在DataKeyNames property,然後再RowCommand event根據RowIndex讀出該row的PK或FK,所以第一步,必須先能在RowCommand獲得目前的RowIndex。
Introduction
.NET 1.x DataGrid
在.NET 1.x的DataGrid,若要使用LinkButton,一樣得放在TemplateColumn內,且ItemCommand event的e.Item.ItemIndex就可抓到RowIndex。
當在DataGrid點下FirstName後,會在下方的Label顯示LastName,LastName是此例的DataKey。
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只需在ItemCommand event的e.Item.ItemIndex就可以輕鬆的抓到RowIndex。
.NET 2.0 GridView
.NET 2.0就改用SqlDataSource和GridView了,LinkButtom一樣得放在TemplateField,但GridView沒有ItemCommand event,取而代之的是RowCommand event。
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最難理解的應該是32行
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e.CommandSource傳的是按下去的LinkButton,不過由於傳回的是Object,就得自行轉成LinkButton,但由於我們想知道的是RowIndex,而LinkButton是包含在GridViewRow內,所以透過NamingContainer傳回目前的GridViewRow,但傳回的是Control,所以需在轉成GridViewRow後才能有RowIndex property。
Conclusion
GridView是DataGrid的繼承人,但不少寫法和DataGrid並不一樣,GridView很多地方比DataGrid更強更好用,但這個例子卻發現GridView比DataGrid麻煩些,或許我沒找到好最好的方法,若有人有更好的方式,歡迎指正,謝謝。