下面列出了将Context Menu绑定到GridView上的几个步骤:
1)在ASP.NET页面上放置ContextMenu控件
2) 在ContextMenu里添加菜单项目单击处理事件
3)加载带有ContextMenuItems的ContextMenu
配置带有ContextMenuID的菜单,可以从下面开始:
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上面的代码使用了ID为ContextMenu1的ContextMenu控件并增加了OnItemCommand事件,该实现在用户单击右键菜单选择菜单项目时触发。
下面代码显示了单击事件。
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当用户选择“Add a new Row”时,我们通过代码设置GridView进入插入模式,这是调用GridView内置的ChangeInsertMode方法实现的。该方法可以让GridView在插入模式和正常模式之间切换。
为了能够让用户插入数据,您可能需要在FooterTemplate放置一些控件,以便使用这些控件收集数据。
假如用户选择“Edit Row”,我们设置GridView的EditIndex属性,这样就可以使用当前行进入编辑模式
当用户选择“Delete Row”时,我们调用一个方法来删除当前行
正如前面介绍的,我们需要设置GridView的ContextMenuID属性,下面代码显示了他的使用
Listing 7
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下面的代码显示了如何为ContextMenu从外部的XML文件加载数据
Listing 8
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该外部的XML文档代码如下
Listing 9
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每一个ContextMenuItem 元素都包含下面的自动:
Text:在ContextMenu显示的上下文
CommandName:处理命令的名称,例如Edit,Delete,Add或者其他的名称
ToolTip:ContextMenuItem上的提示信息
OnClientClick:客户端处理事件
为GridView列标头添加图片
另外,还可以绑定到XML上为头元素的升序/降序添加图片
当配置GridView支持排序时,这个功能会在GridView的头标题添加一个生效、降序图片。当GridView初始化加载时,并没有图片显示,只有您单击列标头素时,才会显示一个图片,您可以通过该图片查看当前排序方式,下图显示了在一列排序的结果
相关的属性为:AscImage和DescImage:这两个属性设置升序/降序的图片
![ctrl+鼠标滚轮缩放](http://www.cnmaster.net/news/upload/2006_11/06112412107172.jpg)
当行数目小于页面大小时修正GridView的高度
您是否注意到当GridView的行数目小于页面PageSize大小时,GridView的高度降会收缩?加入在第一页显示10条记录,当您进入到第2页面时,如果该页面只有5条记录,您会发现GridView会收缩到适应5条记录的高度,这很恼人,因为您更希望GridView总是保持同一高度。
在图6您会发现GridView显示了几条记录,您可能已经注意到几条空的记录,因为这个页面的记录数目小于GridView页面的大小,这个添加是自动添加的
注意:空的记录仅仅是为了维护GridView的高度。
本文介绍扩展的XGrid已经内置了这个功能
内置的文本过滤
这是继ContextMenu后的第二个最有趣的特性。您可以在自定义GridView头标题里TextBox里输入任何文本。
当您在文本框里输入一些文本并单击回车时,将会触发FilterCommand事件,您可以使用该事件实现数据的过滤
相关的属性如下:
IsFilterd:该属性设置是否启用过滤功能,取值为true或者时false。
FilterStyle:这个属性允许您具体指定新加入到头标题的样式。
CSSFilterbox和SkinIDFilterbox
下图显示了一个自定义头标题,可以使用这个功能进行数据过滤
![ctrl+鼠标滚轮缩放](http://www.cnmaster.net/news/upload/2006_11/06112412106705.gif)
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内置的每行的复选和全部的复选
这个功能是在GridView的每一行添加一个CheckBox,这个功能同样参考Dino Esposito的文章
这里有两个属性
AutoGenerateCheckBoxColumn和
CheckBoxColumnIndex
下图显示了运行结果
![ctrl+鼠标滚轮缩放](http://www.cnmaster.net/news/upload/2006_11/06112412124283.jpg)
值得一提的是,当EnableRowClick 或者EnableRowDoubleClick 任何一个被设置为true时,由于MouseOverColor会覆盖SelectRowStyle样式,所以选择一行并不会显示SelectRowStyle的样式
确认按钮
我们已经包含了三种不同的按钮: Confirm 按钮,Image按钮和Confirm Link按钮,这些按钮除了具有常规功能外,还额外添加了下面两个属性:
EnableConfirmMsg:该该属性的取值为true或者是false。当设置为false,该按钮和常规的按钮功能一样。当该属性设置为true时,当客户端向服务器提交信息之前,会出现确认对话框
当EnableConfirmMsg属性被设置为true时,MessageText属性设置弹出消息的具体内容