扩展GridView控件（十）——再增加一种分页样式

介绍
用着GridView自带的分页样式总觉得不太习惯，我们可以在PagerTemplate中来写一些自定义的样式，但是也挺麻烦的，其实我们可以扩展一下GridView，给它再增加一种分页样式

控件开发
1、新建一个继承自GridView的类。

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/// <summary>
/// 继承自GridView
/// </summary>
[ToolboxData(@"<{0}:SmartGridView runat='server'></{0}:SmartGridView>")]
public class SmartGridView : GridView
{
}

2、新建一个Paging类，定义一个分页样式的枚举

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using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
namespace YYControls.SmartGridView
{
/// <summary>
    /// 自定义分页相关
    /// </summary>
    public class Paging
{
/// <summary>
        /// 自定义分页样式
        /// </summary>
        public enum PagingStyleCollection
{
/// <summary>
            /// 不用自定义分页样式
            /// </summary>
            None,
/// <summary>
            /// 默认自定义分页样式
            /// </summary>
            Default
}
}
}

3、在继承自GridView的类中加一个上面定义的枚举属性

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private Paging.PagingStyleCollection _pagingStyle;
/// <summary>
/// 自定义分页样式
/// </summary>
[Description("自定义分页样式"), DefaultValue(""), Category("扩展")]
public Paging.PagingStyleCollection PagingStyle
{
get { return _pagingStyle; }
set { _pagingStyle = value; }
}

4、如果GridView使用的是数据源控件的话，计算总记录数

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/// <summary>
/// OnLoad
/// </summary>
/// <param name="e"></param>
protected override void OnLoad(EventArgs e)
{
// 查找ObjectDataSource
    ObjectDataSource ods = Parent.FindControl(this.DataSourceID) as ObjectDataSource;
if (ods != null)
{
ods.Selected += new ObjectDataSourceStatusEventHandler(ods_Selected);
}
base.OnLoad(e);
}
private int? _recordCount = null;
/// <summary>
/// 计算总记录数
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ods_Selected(object sender, ObjectDataSourceStatusEventArgs e)
{
if (e.ReturnValue is IListSource)
{
_recordCount = ((IListSource) e.ReturnValue).GetList().Count;
}
}

5、重写OnRowCreated以实现自定义分页样式

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/// <summary>
/// OnRowCreated
/// </summary>
/// <param name="e"></param>
protected override void OnRowCreated(GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Pager
&& PagingStyle == Paging.PagingStyleCollection.Default)
{
LinkButton First = new LinkButton();
LinkButton Prev = new LinkButton();
LinkButton Next = new LinkButton();
LinkButton Last = new LinkButton();
TableCell tc = new TableCell();
e.Row.Controls.Clear();
tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));
if (_recordCount.HasValue)
{
tc.Controls.Add(new LiteralControl(_recordCount.ToString()));
tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));
tc.Controls.Add(new LiteralControl(PageSize.ToString()));
tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));
}
tc.Controls.Add(new LiteralControl((PageIndex + 1).ToString()));
tc.Controls.Add(new LiteralControl("/"));
tc.Controls.Add(new LiteralControl(PageCount.ToString()));
tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;&nbsp;&nbsp;"));
if (!String.IsNullOrEmpty(PagerSettings.FirstPageImageUrl))
{
First.Text = "<img src='" + ResolveUrl(PagerSettings.FirstPageImageUrl)
+ "' border='0'/>";
}
else
{
First.Text = PagerSettings.FirstPageText;
}
First.CommandName = "Page";
First.CommandArgument = "First";
First.Font.Underline = false;
if (!String.IsNullOrEmpty(PagerSettings.PreviousPageImageUrl))
{
Prev.Text = "<img src='" + ResolveUrl(PagerSettings.PreviousPageImageUrl)
+ "' border='0'/>";
}
else
{
Prev.Text = PagerSettings.PreviousPageText;
}
Prev.CommandName = "Page";
Prev.CommandArgument = "Prev";
Prev.Font.Underline = false;
if (!String.IsNullOrEmpty(PagerSettings.NextPageImageUrl))
{
Next.Text = "<img src='" + ResolveUrl(PagerSettings.NextPageImageUrl)
+ "' border='0'/>";
}
else
{
Next.Text = PagerSettings.NextPageText;
}
Next.CommandName = "Page";
Next.CommandArgument = "Next";
Next.Font.Underline = false;
if (!String.IsNullOrEmpty(PagerSettings.LastPageImageUrl))
{
Last.Text = "<img src='" + ResolveUrl(PagerSettings.LastPageImageUrl)
+ "' border='0'/>";
}
else
{
Last.Text = PagerSettings.LastPageText;
}
Last.CommandName = "Page";
Last.CommandArgument = "Last";
Last.Font.Underline = false;
if (this.PageIndex <= 0)
{
First.Enabled = Prev.Enabled = false;
}
else
{
First.Enabled = Prev.Enabled = true;
}
tc.Controls.Add(First);
tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));
tc.Controls.Add(Prev);
tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));
// 当前页左边显示的数字分页按钮的数量
        int rightCount = (int) (PagerSettings.PageButtonCount / 2);
// 当前页右边显示的数字分页按钮的数量
        int leftCount = PagerSettings.PageButtonCount % 2 == 0 ? rightCount - 1 : rightCount;
for (int i = 0; i < PageCount; i++)
{
if (PageCount > PagerSettings.PageButtonCount)
{
if (i < PageIndex - leftCount
&& PageCount - 1 - i > PagerSettings.PageButtonCount - 1)
{
continue;
}
else if (i > PageIndex + rightCount
&& i > PagerSettings.PageButtonCount - 1)
{
continue;
}
}
if (i == PageIndex)
{
tc.Controls.Add(new LiteralControl("<span style='color:red;font-weight:bold'>" + (i + 1).ToString() + "</span>"));
}
else
{
LinkButton lb = new LinkButton();
lb.Text = (i + 1).ToString();
lb.CommandName = "Page";
lb.CommandArgument = (i + 1).ToString();
tc.Controls.Add(lb);
}
tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));
}
if (this.PageIndex >= PageCount - 1)
{
Next.Enabled = Last.Enabled = false;
}
else
{
Next.Enabled = Last.Enabled = true;
}
tc.Controls.Add(Next);
tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));
tc.Controls.Add(Last);
tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));
tc.ColumnSpan = this.Columns.Count;
e.Row.Controls.Add(tc);
}
base.OnRowCreated(e);
}

控件使用
添加这个控件到工具箱里，然后拖拽到webform上，设置PagingStyle属性为Default，同时设置GridView的原有属性PageButtonCount，FirstPageText，PreviousPageText，NextPageText，LastPageText，FirstPageImageUrl，PreviousPageImageUrl，NextPageImageUrl，LastPageImageUrl
ObjData.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
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.ComponentModel;
/// <summary>
/// OjbData 的摘要说明
/// </summary>
public class OjbData
{
public OjbData()
{
//
        // TODO: 在此处添加构造函数逻辑
        //
    }
[DataObjectMethod(DataObjectMethodType.Select, true)]
public DataTable Select()
{
DataTable dt = new DataTable();
dt.Columns.Add("no", typeof(string));
dt.Columns.Add("name", typeof(string));
for (int i = 0; i < 30; i++)
{
DataRow dr = dt.NewRow();
dr[0] = "no" + i.ToString().PadLeft(2, '0');
dr[1] = "name" + i.ToString().PadLeft(2, '0');
dt.Rows.Add(dr);
}
return dt;
}
}

Default.aspx

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>SmartGridView测试</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<yyc:SmartGridView ID="SmartGridView1" runat="server" DataSourceID="ObjectDataSource1"
AutoGenerateColumns="False" AllowPaging="true" PagingStyle="Default">
<Columns>
<asp:BoundField DataField="no" HeaderText="序号" SortExpression="no" ItemStyle-Width="100px" />
<asp:BoundField DataField="name" HeaderText="名称" SortExpression="name" ItemStyle-Width="100px" />
<asp:BoundField DataField="no" HeaderText="序号" SortExpression="no" ItemStyle-Width="100px" />
<asp:BoundField DataField="name" HeaderText="名称" SortExpression="name" ItemStyle-Width="100px" />
<asp:BoundField DataField="no" HeaderText="序号" SortExpression="no" ItemStyle-Width="100px" />
<asp:BoundField DataField="name" HeaderText="名称" SortExpression="name" ItemStyle-Width="100px" />
</Columns>
</yyc:SmartGridView>
<asp:ObjectDataSource ID="ObjectDataSource1" runat="server" SelectMethod="Select"
TypeName="OjbData"></asp:ObjectDataSource>
</div>
</form>
</body>
</html>