还是先看一下效果吧。
怎么样,是不是很酷?
下面一步说明如何实现:
写一个自定义控件,继承自System.Web.UI.WebControl.GridView,然后对其进行扩展。
分页的实现:
重写OnRowCreate方法,对PagerRow进行特殊处理,清空里面的控件,加入自己的控件。首页,尾页,上一页,下一页的做法是,往PagerRow中添加四个LinkButton,CommandName设成"Page",CommandArgument分别设成"First","Last","Prev","Next".相应的Text或者Image可直接使用PagerSettings属性中的数据。
直接跳转页和每页记录条数的实现相对麻烦一些。加入两个DropDownList控件,往里面填充数据,并在此类中处理它们的OnSelectedIndexChange事件,重置PageIndex和PageSize.
排序图标的实现:
同样在OnRowCreate方法中,对HeaderRow进行特殊处理,可根据SortExpression属性找到当前正在进行排序的列,根据SortDirection属性得到排序的顺序,根据这两个属性往特定的列添加特定的图标。
滚动条的实现:
重写RenderContents方法,改变原有的HTML流布局。如果不重写,原来的布局如下:
<tr>//-->PagerRow,当PagerPosition设成Top或TopAndBottom的时候,这一行才会出现
</tr>
<tr>//-->HeaderRow
</tr>
<tr>//-->DataRow
</tr>
............
<tr>//-->DataRow
</tr>
<tr>//-->FooterRow
</tr>
<tr>//-->PagerRow(Bottom || TopAndBottom时出现)
</Table>
重写RenderContents的目的就是把整个GridView分隔成三(两)个Table,第一和第三个Table中放PagerRow部分,中间一个Table放在DIV中,固定DIV的高度,使其出现滚动条,对HeaderRow进行特殊处理,使其不会随滚动条的滚动而消失(方法是:style="top:expression(this.parentNode.parentNode.scrollTop);").然后再用一个Table把这三个Table包起来。重写后布局如下:
<tr>
<td>
<Table>PagerRow</Table>
</td>
<tr>
<tr>
<td>
<DIV>
<Table>DataRow && FooterRow</Table>
</DIV>
</td>
</tr>
<tr>
<td>
<Table>PagerRow</Table>
</td>
</tr>
</Table>
接下来说一下具体实现:
1、新建一个Web Control Library类型的工程,命名为myControls,添加一个类myGridView.cs:代码如下:
using System.Data;
using System.Configuration;
using System.Web;
using System.Collections;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.ComponentModel;
namespace CRM2006.GridView
...{
/**//// <summary>
/// Summary description for myGridView
/// </summary>
///
public class CrmGV : System.Web.UI.WebControls.GridView
...{
//private Unit _divheight;
//private int _offset;
private bool isPagerCreated = false;
public CrmGV()
...{
}
[
Description("是否启用自定义分页功能"),
Category("分页"), DefaultValue("false"),Themeable(true)
]
public bool AllowCustomerPagerSettings
...{
get
...{
object o = ViewState["AllowCustomerPagerSettings"];
return (o != null ? (bool)o : false);
}
set
...{
ViewState["AllowCustomerPagerSettings"] = value;
}
}
[Localizable(true), DefaultValue("Current page:"), Themeable(true)]
public string CurrentPageText
...{
get
...{
object o = ViewState["CurrentPageText"];
return (o != null ? o.ToString() : "Current page:");
}
set
...{
ViewState["CurrentPageText"] = value;
}
}
[Localizable(true), DefaultValue("Jump to page"), Themeable(true)]
public string JumpToPageText
...{
get
...{
object o = ViewState["JumpToPageText"];
return (o != null ? o.ToString() : "Jump to page");
}
set
...{
ViewState["JumpToPageText"] = value;
}
}
[Localizable(true), DefaultValue("Display{0}records per page"), Themeable(true)]
public string RecordCountPerPage
...{
get
...{
object o = ViewState["RecordCountPerPage"];
return (o != null ? o.ToString() : "Display{0}records per page");
}
set
...{
ViewState["RecordCountPerPage"] = value;
}
}
[Description("The height of DIV element"), Themeable(true)]
public virtual Unit DIVHeight
...{
get
...{
object o = ViewState["DIVHeight"];
return new Unit(o.ToString());
}
set
...{
ViewState["DIVHeight"] = value;
}
}
[Description("Image Url for sort ascending"),Themeable(true), Editor("System.Web.UI.Design.UrlEditor", typeof(System.Drawing.Design.UITypeEditor))]//Editro特性:指定用以改变属性的编辑器
public string SortAscImageUrl
...{
get
...{
object o = ViewState["SortImageAsc"];
return (o != null ? o.ToString() : "");
}
set