扩展ASP.NET 2.0内置GridView控件之一_Asp.Net开发技巧

本文Bilal Haidar详细解释如何扩展ASP.NET2.0内置的GridView控件，同样还将解释了扩展后的GridView控件所具有的新的重要特征：基于行的上下文菜单和GridViews行的过滤功能。

　　引言

　　本文将聚焦对ASP.NET2.0内置的GridView进行扩展的一系列新功能。其中本文介绍两个主要特征：基于行的上下文菜单（Row_base ContextMenu）和基于过滤功能的GridView的行，在上周我曾经介绍了GridView控件。

　　在我们自定义的GridView控件里，提供了几个具有“高效率”功能的扩展，不过，这些功能都不是GridView控件自带的基本功能，正如您即将看到的，我们需要要重构这些功能。扩展现在的GridView控件可以让您更能够控件常规GridView所没有的功能，另外，扩展该功能后，您以后就可以不断重复的使用这些新特性。

　　我们准备增加如下几个特征：

　　1、行的单击

　　2、行的双击

　　3、基于行的上下文菜单

　　4、头元素的升序降序排列

　　5、当页面记录树木小于PageSize时，修正GridView的高度

　　6、内置的过滤文本框

　　7、内置的复选框

　　除此以外，我们还将添加三个简单按钮，可以利用他们在客户端添加一些简单的确认函数

　　·确认按钮（Confirm Button）

　　·图片按钮（Confirm Image Button）

　　·链接按钮（Confirm Link Button）

　　扩展的XGrid控件需要从GridView控件派生，这也就说这个新的控件可以在ASP.NET2.0上运行。

　　下面代码显示了扩展后的的开始部分：

namespace CustomControls { 　namespace Grid 　{ 　　[ToolboxData("＜{0}:xGrid runat=server＞＜/{0}:xGrid＞")] 　　public partial class xGrid : GridView 　　{

　　要使用这个控件，只要简单的把它通过VS.NET2005的工具栏直接拖放到Web窗体上即可。具体怎把该控件添加VS.NET2005工具栏上则不是本文讨论的范围。

　　下面的代码片断显示了它的基本使用

＜xGrid:xGrid ID="XGrid1" runat="server" AutoGenerateColumns="False" /＞

　　单击（Single Row Click）

　　这是该自定义控件添加的第一个新特性，您现在把鼠标放置到一行数据上然后单击就会引起页面数据的回发，你可能认为使用这个功能实现主/从页面，是的，使用RowClick可以实现这个功能。

　　相关的属性是：

　　·EnableRowClick：这个属性可以取值为true/false，默认为false

　　·MouseOverColor：当EnableRowClick设置为true时，利用该属性设置鼠标移过一行数据显示的结果。单击和双击都使用这个功能。

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