扩展GridView控件(10) - 自定义分页样式

GridView既强大又好用。为了让它更强大、更好用，我们来写一个继承自GridView的控件。
[索引页]
[×××]

扩展GridView控件(10) - 自定义分页样式

作者： webabcd

/*正式版的实现 开始*/

 

介绍
扩展GridView控件：
自定义分页样式。显示总记录数、每页记录数、当前页数、总页数、首页、上一页、下一页、末页和分页按钮

使用方法（设置CustomPagerSettings复合属性）：
PagingMode - 自定义分页的显示模式
TextFormat - 自定义分页的文本显示样式（四个占位符：{0}-每页显示记录数；{1}-总记录数；{2}-当前页数；{3}-总页数）


关键代码

using System;
using System.Collections.Generic;
using System.Text;

using System.Web.UI.WebControls;
using System.Web.UI;
using System.ComponentModel;
using System.Collections;
using System.Data;
using System.Web.UI.HtmlControls;

namespace YYControls.SmartGridViewFunction
{
         /// <summary>
         /// 扩展功能：自定义分页样式
         /// </summary>
         public class CustomPagerSettingsFunction : ExtendFunction
        {
                 /// <summary>
                 /// 构造函数
                 /// </summary>
                 public CustomPagerSettingsFunction()
                        : base()
                {

                }

                 /// <summary>
                 /// 构造函数
                 /// </summary>
                 /// <param name="sgv">SmartGridView对象</param>
                 public CustomPagerSettingsFunction(SmartGridView sgv)
                        : base(sgv)
                {
        
                }

                 /// <summary>
                 /// 扩展功能的实现
                 /// </summary>
                 protected override void Execute()
                {
                         this._sgv.InitPager += new SmartGridView.InitPagerHandler(_sgv_InitPager);    
                }

                 /// <summary>
                 /// SmartGridView的InitPager事件
                 /// </summary>
                 /// <param name="sender"></param>
                 /// <param name="row">一个 System.Web.UI.WebControls.GridViewRow，表示要初始化的页导航行</param>
                 /// <param name="columnSpan">页导航行应跨越的列数</param>
                 /// <param name="pagedDataSource">一个 System.Web.UI.WebControls.PagedDataSource，表示数据源</param>
                 void _sgv_InitPager( object sender, GridViewRow row, int columnSpan, PagedDataSource pagedDataSource)
                {
                         int recordCount = pagedDataSource.DataSourceCount;

                        LinkButton First = new LinkButton();
                        LinkButton Prev = new LinkButton();
                        LinkButton Next = new LinkButton();
                        LinkButton Last = new LinkButton();

                        TableCell tc = new TableCell();

                        row.Controls.Clear();

                        tc.Controls.Add( new LiteralControl( " "));

显示总记录数 每页记录数 当前页数/总页数 #region 显示总记录数 每页记录数 当前页数/总页数
                         string textFormat = String.Format( this._sgv.CustomPagerSettings.TextFormat,
                                pagedDataSource.PageSize,
                                pagedDataSource.DataSourceCount,
                                pagedDataSource.CurrentPageIndex + 1,
                                pagedDataSource.PageCount);
                        tc.Controls.Add( new LiteralControl(textFormat));
                        #endregion

设置“首页 上一页 下一页 末页”按钮 #region 设置“首页 上一页 下一页 末页”按钮
                         if (!String.IsNullOrEmpty( this._sgv.PagerSettings.FirstPageImageUrl))
                                First.Text = "<img src='" + this._sgv.ResolveUrl( this._sgv.PagerSettings.FirstPageImageUrl) + "' border='0'/>";
                         else
                                First.Text = this._sgv.PagerSettings.FirstPageText;

                        First.CommandName = "Page";
                        First.CommandArgument = "First";

                         if (!String.IsNullOrEmpty( this._sgv.PagerSettings.PreviousPageImageUrl))
                                Prev.Text = "<img src='" + this._sgv.ResolveUrl( this._sgv.PagerSettings.PreviousPageImageUrl) + "' border='0'/>";
                         else
                                Prev.Text = this._sgv.PagerSettings.PreviousPageText;

                        Prev.CommandName = "Page";
                        Prev.CommandArgument = "Prev";


                         if (!String.IsNullOrEmpty( this._sgv.PagerSettings.NextPageImageUrl))
                                Next.Text = "<img src='" + this._sgv.ResolveUrl( this._sgv.PagerSettings.NextPageImageUrl) + "' border='0'/>";
                         else
                                Next.Text = this._sgv.PagerSettings.NextPageText;

                        Next.CommandName = "Page";
                        Next.CommandArgument = "Next";

                         if (!String.IsNullOrEmpty( this._sgv.PagerSettings.LastPageImageUrl))
                                Last.Text = "<img src='" + this._sgv.ResolveUrl( this._sgv.PagerSettings.LastPageImageUrl) + "' border='0'/>";
                         else
                                Last.Text = this._sgv.PagerSettings.LastPageText;

                        Last.CommandName = "Page";
                        Last.CommandArgument = "Last";
                        #endregion

添加首页，上一页按钮 #region 添加首页，上一页按钮
                         if ( this._sgv.PageIndex <= 0)
                                First.Enabled = Prev.Enabled = false;
                         else
                                First.Enabled = Prev.Enabled = true;

                        tc.Controls.Add(First);
                        tc.Controls.Add( new LiteralControl( " "));
                        tc.Controls.Add(Prev);
                        tc.Controls.Add( new LiteralControl( " "));
                        #endregion

显示数字分页按钮 #region 显示数字分页按钮
                         // 当前页左边显示的数字分页按钮的数量
                         int rightCount = ( int)( this._sgv.PagerSettings.PageButtonCount / 2);
                         // 当前页右边显示的数字分页按钮的数量
                         int leftCount = this._sgv.PagerSettings.PageButtonCount % 2 == 0 ? rightCount - 1 : rightCount;
                         for ( int i = 0; i < this._sgv.PageCount; i++)
                        {
                                 if ( this._sgv.PageCount > this._sgv.PagerSettings.PageButtonCount)
                                {
                                         if (i < this._sgv.PageIndex - leftCount && this._sgv.PageCount - 1 - i > this._sgv.PagerSettings.PageButtonCount - 1)
                                        {
                                                 continue;
                                        }
                                         else if (i > this._sgv.PageIndex + rightCount && i > this._sgv.PagerSettings.PageButtonCount - 1)
                                        {
                                                 continue;
                                        }
                                }

                                 if (i == this._sgv.PageIndex)
                                {
                                        tc.Controls.Add( new LiteralControl( "<span>" + (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( " "));
                        }
                        #endregion

添加下一页，末页按钮 #region 添加下一页，末页按钮
                         if ( this._sgv.PageIndex >= this._sgv.PageCount - 1)
                                Next.Enabled = Last.Enabled = false;
                         else
                                Next.Enabled = Last.Enabled = true;

                        tc.Controls.Add(Next);
                        tc.Controls.Add( new LiteralControl( " "));
                        tc.Controls.Add(Last);
                        tc.Controls.Add( new LiteralControl( " "));
                        #endregion

                        tc.Controls.Add( new LiteralControl( " "));

                        tc.ColumnSpan = this._sgv.Columns.Count;

                        row.Controls.Add(tc);                
                }
        }
}

 

/*正式版的实现 结束*/

 

/*测试版的实现 开始*/

 

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。

/// <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

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

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

/// <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;
                        }
                }

 

 

未完待续>>

转载于:https://blog.51cto.com/webabcd/345575