用GridView编辑更新独立的单元格
翻译出处:http://www.codeproject.com/KB/webforms/EditGridviewCells.aspx
源代码下载
介绍
在asp.net 中,GridView允许你通过EditIndex属性来修改数据的一行,同样也必须进行整行更新。
你可能不想对整行进行更新,并且常规更新是利用EditItemTemplate,在它内部放上编辑状态所要显示的控件;而事实上,你可能只对其中一个单元格感兴趣,比如用上DropDownList来进行单元格筛选,而常规必须整行成编辑状态,那怎样才能直接只让一个独立的单元格成编辑状态呢?那就是本篇文章所要做的事情。
编辑独立的单元格
本篇提供的源代码中,GridView的第一列是CommandName为SingleClick的asp:ButtonField的控件,并且它的Visible置false.
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而在其他的列中,利用ItemTemplate,在其中都有一个可见的Label控件,和不可见的TextBox或者DropdownList控件。
为了方便起见,我将叫这个Label为“非编辑状态控件”和TextBox或者DropdownList的“编辑状态控件”。![](/Images/OutliningIndicators/None.gif)
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想法是这样的,刚开始GridView处于显示状态(也就是“非编辑状态”),当某一个单元格被点击的时候,它把Label控件置不可见而编辑控件TextBox或者DropdownList置肯见,而EditItemTemplate不需要用到。
在GridView的RowDataBound的事件内对每一行中的每个单元格进行遍历,让其拥有点击触发事件的能力。
给每个单元的列索引定义上一些属性参数,如onclick,style等等。![](/Images/OutliningIndicators/None.gif)
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在GridView的RowCommand事件,命令参数和事件参数被重新检索,它带给我们选择某一单元格所在的行索引和列索引。
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当所选单元格的行索引和列索引已知的情况下,单元格能够很轻松地对编辑状态进行控件的可见转换。
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还有一些代码是在事件回发之后在编辑控件上置焦点。如果编辑控件是一个DropDownList那么它的SelectedValue属性被置上显示控件的值,如果编辑控件是一个TextBox那么它的文本被选上将准备进行编辑。
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在这个例子中,GridView的RowUpdating先检查每个单元格,看是否处于编辑模式下。如果处于编辑模式的单元格被找到,那么数据更新将被执行。
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为了确保RowUpdating在GridView在未选中行状态下也能够被调用,例如我在编辑模式下编辑文本框点击了“Enter”键,页面整页回发,这样确保任何数据的改变被保存。
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注册回发或回调数据以进行验证
创建在RowDataBound的自定义事件必须在页面中被注册。
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