千万级数据分页之三----实现设计时支持和数字分页

 千万级数据分页之三----实现设计时支持和数字分页     

一。对上一版本源代码的修正

上一篇文章《 千万级数据分页之二---一个简单的自定义分页控件》发布了一个分页控件的源码，但是这个分页控件的设计时支持不太好，出现了“未处理的异常，输入字符串的格式不正确”的错误，如下图所示：

原因是以下代码引起的异常：

int pageCount = int.Parse(_lblPageCount.Text); //获取总页数

修改为以下代码后即显示正常，如图所示：

 

 if (_lblPageCount.Text == "")
                ...{
                    _lnkbtnLast.Enabled = false;
                }
                else
                ...{
                    int pageCount = int.Parse(_lblPageCount.Text); //获取总页数
                    if (PageIndex == pageCount)//如果当前页为最后一页，则末页灰显
                    ...{
                        _lnkbtnLast.Enabled = false;
                    }
                    else
                    ...{
                        _lnkbtnLast.Enabled = true;
                    }
                }

二、增加“自动套用格式”：

一个设计完善友好的控件离不开设计时支持，其中ControlDesigner作为web服务器控件的设计器的基类，通过继承此类，你可以实现需要的设计时效果。如果你要继承类似Label这样的控件，可以通过继承LabelDesigner来实现相应的功能。而要实现”自动套用格式“，就要继承DesignerAutoFormat类，实现自定义样式。DesignerAutoFormat 是一个基类，如果你想为你的控件在设计时提供格式化的功能,你可以从此类派生,你必须实现Apply方法,此方法会将相关联的控件设置样式.

继承DesignerAutoFormat类，重写Apply(Control control)方法，实现两种样式，分别是“英文样式”和“符号样式”。

using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Web.UI;
using System.Web;
using System.Web.UI.Design;
using System.Web.UI.Design.WebControls;
using System.Web.UI.WebControls;
using System.Drawing;
namespace CustomControls
...{
    public class AspNetPagerAutoFormat : DesignerAutoFormat
    ...{
        public AspNetPagerAutoFormat(string name) : base(name) ...{ }
        public override void Apply(Control control)
        ...{
            if (control is AspNetPager)
            ...{
                AspNetPager aspNetPager = (AspNetPager)control;
                if (this.Name == "英文样式")
                ...{
                    aspNetPager.ButtonText = "Go";
                    aspNetPager.FirstPageText = "First";
                    aspNetPager.PrePageText = "Prev";
                    aspNetPager.NextPageText = "Next";
                    aspNetPager.EndPageText = "End";
                    aspNetPager.LabelStyle.ForeColor = Color.Blue;
                    aspNetPager.LabelStyle.Font.Bold = true;
                    aspNetPager.TextBoxStyle.CssClass = "blue_rounded";
                    aspNetPager.TextBoxStyle.Width = Unit.Parse("50px");
                    aspNetPager.PageSize = 20;
                    aspNetPager.RecordCount = 0;
                }
                else if (this.Name == "符号样式")
                ...{
                    aspNetPager.ButtonText = "转到";
                    aspNetPager.FirstPageText = "<font face=webdings color="red">9</font>";
                    aspNetPager.PrePageText = "<font face=webdings color="red">7</font>";
                    aspNetPager.NextPageText = "<font face=webdings color="red">8</font>";
                    aspNetPager.EndPageText = "<font face=webdings color="red">:</font>";
                    aspNetPager.LabelStyle.ForeColor = Color.Red;
                    aspNetPager.LabelStyle.Font.Bold = true;
                    aspNetPager.TextBoxStyle.CssClass = "blue_rounded";
                    aspNetPager.TextBoxStyle.Width = Unit.Parse("40px");
                    aspNetPager.PageSize = 40;
                }
            }
            else
            ...{
                throw new Exception("The method or operation is not implemented.");
            }
        }
    }
}

继承ControlDesigner类，重写AutoFormats属性以实现自定义“自动套用格式”，其中给AspNetPagerDesigner类加上加上SupportsPreviewControl元数据,这样可以支持预览功能：

 

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Web.UI.Design;
namespace CustomControls
...{
    [SupportsPreviewControl(true)]
    public class AspNetPagerDesigner : ControlDesigner
    ...{
        private DesignerAutoFormatCollection _dafc;
        public override DesignerAutoFormatCollection AutoFormats
        ...{
            get
            ...{
                if (_dafc == null)
                ...{
                    _dafc = new DesignerAutoFormatCollection();
                    _dafc.Add(new AspNetPagerAutoFormat("英文样式"));
                    _dafc.Add(new AspNetPagerAutoFormat("符号样式"));
                }
                return _dafc;
            }
        }
    }
}

下面是设计时效果，把鼠标移动到控件上方，右上角就会出现一个黑三角，点击该三角，出现一个任务栏，点击“自动套用格式”，就会出现“自动套用格式”对话框，选取左边列表的任意一个样式，点确定即可。

其中套用”英文样式后效果如下：

套用“字符样式后效果如下：

三、数字分页效果的实现：

首先定义十个LinkButton,如下代码所示：

 

        private LinkButton _page_0;
        private LinkButton _page_1;
        private LinkButton _page_2;
        private LinkButton _page_3;
        private LinkButton _page_4;
        private LinkButton _page_5;
        private LinkButton _page_6;
        private LinkButton _page_7;
        private LinkButton _page_8;
        private LinkButton _page_9;

在CreateChildControls()方法中生成这些控件，并定义一个共同的点击事件“BtnChangePage_Click”，

 

 _page_0 = new LinkButton();
            _page_0.ID = "_page_0";
            _page_0.Click += new EventHandler(CurrentPage_Click);
            _page_1 = new LinkButton();
            _page_1.ID = "_page_1";
            _page_1.Click += new EventHandler(CurrentPage_Click);
            _page_2 = new LinkButton();
            _page_2.ID = "_page_2";
            _page_2.Click += new EventHandler(CurrentPage_Click);
            _page_3 = new LinkButton();
            _page_3.ID = "_page_3";
            _page_3.Click += new EventHandler(CurrentPage_Click);
            _page_4 = new LinkButton();
            _page_4.ID = "_page_4";
            _page_4.Click += new EventHandler(CurrentPage_Click);
            _page_5 = new LinkButton();
            _page_5.ID = "_page_5";
            _page_5.Click += new EventHandler(CurrentPage_Click);
            _page_6 = new LinkButton();
            _page_6.ID = "_page_6";
            _page_6.Click += new EventHandler(CurrentPage_Click);
            _page_7 = new LinkButton();
            _page_7.ID = "_page_7";
            _page_7.Click += new EventHandler(CurrentPage_Click);
            _page_8 = new LinkButton();
            _page_8.ID = "_page_8";
            _page_8.Click += new EventHandler(CurrentPage_Click);
            _page_9 = new LinkButton();
            _page_9.ID = "_page_9";
            _page_9.Click += new EventHandler(CurrentPage_Click);
            _txtPageIndex = new TextBox();
            _txtPageIndex.ID = "txtPageIndex";
            _lblPageSize = new Label();
            _lblPageSize.ID = "lblPageSize";
            this.Controls.Add(_page_0);
            this.Controls.Add(_page_1);
            this.Controls.Add(_page_2);
            this.Controls.Add(_page_3);
            this.Controls.Add(_page_4);
            this.Controls.Add(_page_5);
            this.Controls.Add(_page_6);
            this.Controls.Add(_page_7);
            this.Controls.Add(_page_8);
            this.Controls.Add(_page_9);

CurrentPage_Click事件的代码：

 

 protected void CurrentPage_Click(object sender, EventArgs e)
        ...{
            string strID = ((LinkButton)sender).ID;
            if (strID != "")
            ...{
                int pageIndex = 0;
                int pageNum = PageIndex / 10;
                try
                ...{
                    int pageNum2 = int.Parse(strID.Split('_')[2]);
                    if (pageNum2 == 0)
                        pageNum2 = 10;
                    pageIndex = pageNum2 + pageNum*10;
                }
                catch
                ...{
                    System.Web.HttpContext.Current.Response.Write("<Script>alert('非法的页码!');</script>");
                    return;
                }
                _lblCurrentPage.Text = pageIndex.ToString();
                OnPageChanged(EventArgs.Empty);
            }
        }

然后绘制控件，根据总页数和当前页码显示10个数字页，比如当前页是23页，则显示21到30共十个页的页码。

 

if (_lblPageCount.Text == "")
            ...{
                for (int i = 0; i < 10; i++)
                ...{
                    LinkButton lb = (LinkButton)this.FindControl("_page_" + i.ToString());
                    lb.Enabled = false;
                    lb.Text = (i + 1).ToString();
                    lb.RenderControl(writer);
                    writer.Write("&nbsp;");

                }
            }
            else
            ...{
                int pageCount = int.Parse(_lblPageCount.Text);
                int quot = PageIndex / 10;
                int rema = PageIndex % 10;
                //PageNum = quot * 10;
                if (pageCount < 10 || pageCount - PageIndex < 10)
                ...{
                    for (int i = quot * 10 + 1; i <= pageCount; i++)
                    ...{
                        LinkButton lb2 = (LinkButton)this.FindControl("_page_" + (i % 10).ToString());
                        lb2.Text = i.ToString();
                        if (i == PageIndex)
                        ...{
                            lb2.Enabled = false;
                            lb2.Font.Bold = true;
                            lb2.ForeColor = Color.Red;
                        }
                        else
                        ...{
                            lb2.Enabled = true;
                        }
                        lb2.RenderControl(writer);
                        writer.Write("&nbsp;");
                    }
                }
                else
                ...{
                    for (int i = quot * 10 + 1; i <= quot * 10 + 10; i++)
                    ...{
                        LinkButton lb2 = (LinkButton)this.FindControl("_page_" + (i % 10).ToString());
                        lb2.Text = i.ToString();
                        if (i == PageIndex)
                        ...{
                            lb2.Enabled = false;
                            lb2.Font.Bold = true;
                            lb2.ForeColor = Color.Red;
                        }
                        else
                        ...{
                            lb2.Enabled = true;
                        }
                        lb2.RenderControl(writer);
                        writer.Write("&nbsp;");
                    }
                }
            }

设计时效果如下图所示：

分页效果如下：

控件的源码如下：

 

using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;

namespace CustomControls
...{
    [Designer(typeof(AspNetPagerDesigner)),ToolboxData("<{0}:AspNetPager runat='server' PageSize='25' FirstPageText='首页' PrePageText='上一页' NextPageText='下一页' EndPageText='末页' ButtonText='GO'></{0}:AspNetPager>")]
    public class AspNetPager : WebControl, INamingContainer
    ...{
        属性块#region 属性块
        private object baseState = null;
        private object buttonStyleState = null;
        private object textBoxStyleState = null;
        private object labelStyleState = null;
        private object linkButtonStyleState = null;
        private LinkButton _lnkbtnFrist;
        private LinkButton _lnkbtnPre;
        private LinkButton _lnkbtnNext;
        private LinkButton _lnkbtnLast;
        private Label _lblCurrentPage;
        private Label _lblRecodeCount;
        private Label _lblPageCount;
        private Label _lblPageSize;
        private TextBox _txtPageIndex;
        private Button _btnChangePage;
        private LinkButton _page_0;
        private LinkButton _page_1;
        private LinkButton _page_2;
        private LinkButton _page_3;
        private LinkButton _page_4;
        private LinkButton _page_5;
        private LinkButton _page_6;
        private LinkButton _page_7;
        private LinkButton _page_8;
        private LinkButton _page_9;
        private static readonly object EventPageChange = new object();
        [Category("Pagination"), Description("每页显示的纪录数"),
        DefaultValue("25")]
        public virtual int PageSize
        ...{
            get
            ...{
                EnsureChildControls();
                return _lblPageSize.Text.Trim() != "" ? int.Parse(_lblPageSize.Text.Trim()) : 25;
            }
            set
            ...{
                EnsureChildControls();
                _lblPageSize.Text = value.ToString();
            }
        }
        [Category("Pagination"), Description("总纪录数"),
       DefaultValue("0"), Bindable(true)]
        public virtual int RecordCount
        ...{
            get
            ...{
                EnsureChildControls();
                return _lblRecodeCount.Text.Trim() != "" ? int.Parse(_lblRecodeCount.Text.Trim()) : 0;
            }
            set
            ...{
                EnsureChildControls();
                if (value > 0)
                ...{
                    int recodeCount = value;
                    _lblPageCount.Text = (value % PageSize == 0 ? value / PageSize : value / PageSize + 1).ToString();//计算总页数
                }
                _lblRecodeCount.Text = value.ToString();
            }
        }
        [Category("Pagination"), Description("当前页码"),
        DefaultValue("1"), Bindable(true)]
        public virtual int PageIndex
        ...{
            get
            ...{
                EnsureChildControls();
                return _lblCurrentPage.Text.Trim() != "" ? int.Parse(_lblCurrentPage.Text.Trim()) : 1;
            }
            set
            ...{
                EnsureChildControls();
                _lblCurrentPage.Text = value.ToString();
            }
        }
        [Category("Appearance"), Description("设置第一页的文本"),
        DefaultValue("首页"), Bindable(true)]
        public virtual string FirstPageText
        ...{
            get
            ...{
                EnsureChildControls();
                return _lnkbtnFrist.Text.Trim() != "" ? _lnkbtnFrist.Text.Trim() : "首页";
            }
            set
            ...{
                EnsureChildControls();
                _lnkbtnFrist.Text = value;
            }
        }
        [Category("Appearance"), Description("设置上一页的文本"),
        DefaultValue("上一页"), Bindable(true)]
        public virtual string PrePageText
        ...{
            get
            ...{
                EnsureChildControls();
                return _lnkbtnPre.Text.Trim() != "" ? _lnkbtnPre.Text.Trim() : "上一页";
            }
            set
            ...{
                EnsureChildControls();
                _lnkbtnPre.Text = value;
            }
        }
        [Category("Appearance"), Description("设置下一页的文本"),
       DefaultValue("下一页"), Bindable(true)]
        public virtual string NextPageText
        ...{
            get
            ...{
                EnsureChildControls();
                return _lnkbtnNext.Text.Trim() != "" ? _lnkbtnNext.Text.Trim() : "下一页";
            }
            set
            ...{
                EnsureChildControls();
                _lnkbtnNext.Text = value;
            }
        }
        [Category("Appearance"), Description("设置末页的文本"),
      DefaultValue("末页"), Bindable(true)]
        public virtual string EndPageText
        ...{
            get
            ...{
                EnsureChildControls();
                return _lnkbtnLast.Text.Trim() != "" ? _lnkbtnLast.Text.Trim() : "末页";
            }
            set
            ...{
                EnsureChildControls();
                _lnkbtnLast.Text = value;
            }
        }
        [Category("Appearance"), Description("设置跳转按钮的文本"),
      DefaultValue(":"), Bindable(true)]
        public virtual string ButtonText
        ...{
            get
            ...{
                EnsureChildControls();
                return _btnChangePage.Text.Trim() != "" ? _btnChangePage.Text.Trim() : "GO";
            }
            set
            ...{
                EnsureChildControls();
                _btnChangePage.Text = value;
            }
        }
        #endregion

        分页事件相关#region 分页事件相关
        public event EventHandler PageChanged
        ...{
            add
            ...{
                Events.AddHandler(EventPageChange, value);
            }
            remove
            ...{
                Events.RemoveHandler(EventPageChange, value);
            }

        }
        protected void OnPageChanged(EventArgs e)
        ...{
            EventHandler handler = (EventHandler)Events[EventPageChange];
            if (handler != null)
            ...{
                handler(this, e);
            }
        }
        #endregion

        样式属性#region 样式属性
        private Style _buttonStyle;
        private Style _textBoxStyle;
        private Style _linkButtonStyle;
        [
        Category("Styles"),
        DefaultValue(null),
        DesignerSerializationVisibility(
            DesignerSerializationVisibility.Content),
        PersistenceMode(PersistenceMode.InnerProperty),
        Description(
            "应用于按钮的样式")
        ]
        public virtual Style ButtonStyle
        ...{
            get
            ...{
                if (_buttonStyle == null)
                ...{
                    _buttonStyle = new Style();
                    if (IsTrackingViewState)
                    ...{
                        ((IStateManager)_buttonStyle).TrackViewState();
                    }
                }
                return _buttonStyle;
            }
        }
        [
       Category("Styles"),
       DefaultValue(null),
       DesignerSerializationVisibility(
           DesignerSerializationVisibility.Content),
       PersistenceMode(PersistenceMode.InnerProperty),
       Description(
           "应用于链接按钮的样式")
       ]
        public virtual Style LinkButtonStyle
        ...{
            get
            ...{
                if (_linkButtonStyle == null)
                ...{
                    _linkButtonStyle = new Style();
                    if (IsTrackingViewState)
                    ...{
                        ((IStateManager)_linkButtonStyle).TrackViewState();
                    }
                }
                return _linkButtonStyle;
            }
        }

        [
        Category("Styles"),
        DefaultValue(null),
        DesignerSerializationVisibility(
            DesignerSerializationVisibility.Content),
        PersistenceMode(PersistenceMode.InnerProperty),
        Description(
            "应用于文本框的样式")
        ]
        public virtual Style TextBoxStyle
        ...{
            get
            ...{
                if (_textBoxStyle == null)
                ...{
                    _textBoxStyle = new Style();
                    if (IsTrackingViewState)
                    ...{
                        ((IStateManager)_textBoxStyle).TrackViewState();
                    }
                }
                return _textBoxStyle;
            }
        }
        private Style _labelStyle;
        [
        Category("Styles"),
        DefaultValue(null),
        DesignerSerializationVisibility(
            DesignerSerializationVisibility.Content),
        PersistenceMode(PersistenceMode.InnerProperty),
        Description(
            "应用于标签的样式")
        ]
        public virtual Style LabelStyle
        ...{
            get
            ...{
                if (_labelStyle == null)
                ...{
                    _labelStyle = new Style();
                    if (IsTrackingViewState)
                    ...{
                        ((IStateManager)_labelStyle).TrackViewState();
                    }
                }
                return _labelStyle;
            }
        }
        #endregion

        自定义视图状态#region 自定义视图状态
        protected override void LoadViewState(object savedState)
        ...{
            if (savedState == null)
            ...{
                base.LoadViewState(null);
                return;
            }
            else
            ...{
                Triplet t = savedState as Triplet;

                if (t != null)
                ...{
                    base.LoadViewState(baseState);

                    if ((t.Second) != null)
                    ...{
                        ((IStateManager)ButtonStyle).LoadViewState(buttonStyleState);
                    }

                    if ((t.Third) != null)
                    ...{
                        ((IStateManager)TextBoxStyle).LoadViewState(textBoxStyleState);
                    }
                    if (labelStyleState != null)
                    ...{
                        ((IStateManager)(_labelStyle)).LoadViewState(labelStyleState);
                    }
                    if (linkButtonStyleState != null)
                    ...{
                        ((IStateManager)(_linkButtonStyle)).LoadViewState(linkButtonStyleState);
                    }
                }
                else
                ...{
                    throw new ArgumentException("Invalid view state .");
                }
            }
        }

        protected override object SaveViewState()
        ...{
            baseState = base.SaveViewState();
            buttonStyleState = null;
            textBoxStyleState = null;
            labelStyleState = null;
            linkButtonStyleState = null;
            if (_buttonStyle != null)
            ...{
                buttonStyleState =
                    ((IStateManager)_buttonStyle).SaveViewState();
            }

            if (_textBoxStyle != null)
            ...{
                textBoxStyleState =
                    ((IStateManager)_textBoxStyle).SaveViewState();
            }
            if (_labelStyle != null)
            ...{
                labelStyleState = ((IStateManager)_labelStyle).SaveViewState();
            }
            if (_linkButtonStyle != null)
            ...{
                linkButtonStyleState = ((IStateManager)_linkButtonStyle).SaveViewState();
            }
            return new Triplet(baseState,
                buttonStyleState, textBoxStyleState);

        }

        protected override void TrackViewState()
        ...{
            base.TrackViewState();
            if (_buttonStyle != null)
            ...{
                ((IStateManager)_buttonStyle).TrackViewState();
            }
            if (_textBoxStyle != null)
            ...{
                ((IStateManager)_textBoxStyle).TrackViewState();
            }
            if (_labelStyle != null)
            ...{
                ((IStateManager)_labelStyle).TrackViewState();
            }
            if (_linkButtonStyle != null)
            ...{
                ((IStateManager)_linkButtonStyle).TrackViewState();
            }
        }
        #endregion

        生成控件#region 生成控件
        protected override void CreateChildControls()
        ...{
            this.Controls.Clear();
            _btnChangePage = new Button();
            _btnChangePage.ID = "btnChangePage";
            _btnChangePage.Click += new EventHandler(BtnChangePage_Click);
            _lblCurrentPage = new Label();
            _lblCurrentPage.ID = "lblCurrentPage";
            _lblPageCount = new Label();
            _lblPageCount.ID = "lblPageCount";
            _lblRecodeCount = new Label();
            _lblRecodeCount.ID = "lblRecodeCount";
            _lnkbtnFrist = new LinkButton();
            _lnkbtnFrist.ID = "lnkbtnFrist";
            _lnkbtnFrist.Click += new EventHandler(lnkbtnFrist_Click);
            _lnkbtnLast = new LinkButton();
            _lnkbtnLast.ID = "lnkbtnLast";
            _lnkbtnLast.Click += new EventHandler(lnkbtnLast_Click);
            _lnkbtnNext = new LinkButton();
            _lnkbtnNext.ID = "lnkbtnNext";
            _lnkbtnNext.Click += new EventHandler(lnkbtnNext_Click);
            _lnkbtnPre = new LinkButton();
            _lnkbtnPre.ID = "lnkbtnPre";
            _lnkbtnPre.Click += new EventHandler(lnkbtnPre_Click);
            _page_0 = new LinkButton();
            _page_0.ID = "_page_0";
            _page_0.Click += new EventHandler(CurrentPage_Click);
            _page_1 = new LinkButton();
            _page_1.ID = "_page_1";
            _page_1.Click += new EventHandler(CurrentPage_Click);
            _page_2 = new LinkButton();
            _page_2.ID = "_page_2";
            _page_2.Click += new EventHandler(CurrentPage_Click);
            _page_3 = new LinkButton();
            _page_3.ID = "_page_3";
            _page_3.Click += new EventHandler(CurrentPage_Click);
            _page_4 = new LinkButton();
            _page_4.ID = "_page_4";
            _page_4.Click += new EventHandler(CurrentPage_Click);
            _page_5 = new LinkButton();
            _page_5.ID = "_page_5";
            _page_5.Click += new EventHandler(CurrentPage_Click);
            _page_6 = new LinkButton();
            _page_6.ID = "_page_6";
            _page_6.Click += new EventHandler(CurrentPage_Click);
            _page_7 = new LinkButton();
            _page_7.ID = "_page_7";
            _page_7.Click += new EventHandler(CurrentPage_Click);
            _page_8 = new LinkButton();
            _page_8.ID = "_page_8";
            _page_8.Click += new EventHandler(CurrentPage_Click);
            _page_9 = new LinkButton();
            _page_9.ID = "_page_9";
            _page_9.Click += new EventHandler(CurrentPage_Click);
            _txtPageIndex = new TextBox();
            _txtPageIndex.ID = "txtPageIndex";
            _lblPageSize = new Label();
            _lblPageSize.ID = "lblPageSize";
            this.Controls.Add(_page_0);
            this.Controls.Add(_page_1);
            this.Controls.Add(_page_2);
            this.Controls.Add(_page_3);
            this.Controls.Add(_page_4);
            this.Controls.Add(_page_5);
            this.Controls.Add(_page_6);
            this.Controls.Add(_page_7);
            this.Controls.Add(_page_8);
            this.Controls.Add(_page_9);
            this.Controls.Add(_btnChangePage);
            this.Controls.Add(_lblCurrentPage);
            this.Controls.Add(_lblPageCount);
            this.Controls.Add(_lblRecodeCount);
            this.Controls.Add(_lnkbtnFrist);
            this.Controls.Add(_lnkbtnLast);
            this.Controls.Add(_lnkbtnNext);
            this.Controls.Add(_lnkbtnPre);
            this.Controls.Add(_txtPageIndex);
            base.CreateChildControls();
        }
        #endregion

        按钮点击事件#region 按钮点击事件
        翻页相关的事件#region 翻页相关的事件
        /**//// <summary>
        /// 处理翻页事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void lnkbtnFrist_Click(object sender, EventArgs e) //第一页
        ...{
            _lblCurrentPage.Text = "1";
            OnPageChanged(EventArgs.Empty);
        }
        protected void lnkbtnPre_Click(object sender, EventArgs e) //上一页
        ...{
            int pageIndex = int.Parse(_lblCurrentPage.Text);
            if (pageIndex > 0)
            ...{
                pageIndex--;
                _lblCurrentPage.Text = pageIndex.ToString();
                OnPageChanged(EventArgs.Empty);
            }
        }
        protected void lnkbtnNext_Click(object sender, EventArgs e)//下一页
        ...{
            int pageIndex = int.Parse(_lblCurrentPage.Text);
            int pageCount = int.Parse(_lblPageCount.Text);
            if (pageIndex < pageCount)
            ...{
                pageIndex++;
                _lblCurrentPage.Text = pageIndex.ToString();
            }
            OnPageChanged(EventArgs.Empty);
        }
        protected void lnkbtnLast_Click(object sender, EventArgs e)//末页
        ...{
            _lblCurrentPage.Text = _lblPageCount.Text;
            OnPageChanged(EventArgs.Empty);
        }
        protected void CurrentPage_Click(object sender, EventArgs e)
        ...{
            string strID = ((LinkButton)sender).ID;
            if (strID != "")
            ...{
                int pageIndex = 0;
                int pageNum = PageIndex / 10;
                try
                ...{
                    int pageNum2 = int.Parse(strID.Split('_')[2]);
                    if (pageNum2 == 0)
                        pageNum2 = 10;
                    pageIndex = pageNum2 + pageNum*10;
                }
                catch
                ...{
                    System.Web.HttpContext.Current.Response.Write("<Script>alert('非法的页码!');</script>");
                    return;
                }
                _lblCurrentPage.Text = pageIndex.ToString();
                OnPageChanged(EventArgs.Empty);
            }
        }
        #endregion
        protected void BtnChangePage_Click(object sender, EventArgs e)//跳转到指定页
        ...{
            int pageIndex = 0;
            try
            ...{
                pageIndex = int.Parse(_txtPageIndex.Text);
            }
            catch
            ...{
                System.Web.HttpContext.Current.Response.Write("<Script>alert('请输入正确的页数!');</script>");
                return;
            }
            int pageCount = int.Parse(_lblPageCount.Text);
            if (pageIndex == 0)//如果为0，则提示错误
            ...{
                System.Web.HttpContext.Current.Response.Write("<Script>alert('请输入正确的页数!');</script>");
                return;
            }
            if (pageIndex > pageCount)//如果大于总页数则提示错误
            ...{
                System.Web.HttpContext.Current.Response.Write("<Script>alert('请输入正确的页数!');</script>");
                return;
            }
            _lblCurrentPage.Text = pageIndex.ToString();
            OnPageChanged(EventArgs.Empty);
        }
        #endregion

        重写TagKey#region 重写TagKey
        protected override HtmlTextWriterTag TagKey
        ...{
            get
            ...{
                return HtmlTextWriterTag.Table;
            }
        }
        #endregion

        绘制控件#region 绘制控件
        protected override void RenderContents(HtmlTextWriter writer)
        ...{
            if (ButtonStyle != null)
            ...{
                _btnChangePage.ApplyStyle(ButtonStyle);
            }
            if (TextBoxStyle != null)
            ...{
                _txtPageIndex.ApplyStyle(TextBoxStyle);
            }
            if (LabelStyle != null)
            ...{
                _lblCurrentPage.ApplyStyle(LabelStyle);
                _lblPageCount.ApplyStyle(LabelStyle);
                _lblRecodeCount.ApplyStyle(LabelStyle);
                _lblPageSize.ApplyStyle(LabelStyle);
            }
            AddAttributesToRender(writer);
            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
            writer.AddAttribute(HtmlTextWriterAttribute.Align, "right");
            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            writer.Write("当前第");
            if (_lblCurrentPage != null)
                _lblCurrentPage.RenderControl(writer);
            writer.Write("页,每页");
            if (_lblPageSize != null)
            ...{
                _lblPageSize.RenderControl(writer);
            }
            writer.Write("条纪录,总共");
            if (_lblRecodeCount != null)
                _lblRecodeCount.RenderControl(writer);
            writer.Write("条纪录,共");
            if (_lblPageCount != null)
                _lblPageCount.RenderControl(writer);
            writer.Write("页&nbsp;&nbsp;[&nbsp;&nbsp;");
            if (_lnkbtnFrist != null)
            ...{
                if (PageIndex == 1) //如果是第一页，则第一页灰显，作用是避免不必要的点击造成没必要的数据传输
                ...{
                    _lnkbtnFrist.Enabled = false;
                }
                else
                ...{
                    _lnkbtnFrist.Enabled = true;
                }
                _lnkbtnFrist.RenderControl(writer);
            }
            writer.Write("&nbsp;");
            if (_lnkbtnPre != null)
            ...{
                if (PageIndex > 1) //如果当前页大于1，则上一页显示，否则灰显
                ...{
                    _lnkbtnPre.Enabled = true;
                }
                else
                ...{
                    _lnkbtnPre.Enabled = false;
                }
                _lnkbtnPre.RenderControl(writer);
            }
            writer.Write("&nbsp;");
            if (_lblPageCount.Text == "")
            ...{
                for (int i = 0; i < 10; i++)
                ...{
                    LinkButton lb = (LinkButton)this.FindControl("_page_" + i.ToString());
                    lb.Enabled = false;
                    lb.Text = (i + 1).ToString();
                    lb.RenderControl(writer);
                    writer.Write("&nbsp;");

                }
            }
            else
            ...{
                int pageCount = int.Parse(_lblPageCount.Text);
                int quot = PageIndex / 10;
                int rema = PageIndex % 10;
                if (pageCount < 10 || pageCount - PageIndex < 10)
                ...{
                    for (int i = quot * 10 + 1; i <= pageCount; i++)
                    ...{
                        LinkButton lb2 = (LinkButton)this.FindControl("_page_" + (i % 10).ToString());
                        lb2.Text = i.ToString();
                        if (i == PageIndex)
                        ...{
                            lb2.Enabled = false;
                            lb2.Font.Bold = true;
                            lb2.ForeColor = Color.Red;
                        }
                        else
                        ...{
                            lb2.Enabled = true;
                        }
                        lb2.RenderControl(writer);
                        writer.Write("&nbsp;");
                    }
                }
                else
                ...{
                    for (int i = quot * 10 + 1; i <= quot * 10 + 10; i++)
                    ...{
                        LinkButton lb2 = (LinkButton)this.FindControl("_page_" + (i % 10).ToString());
                        lb2.Text = i.ToString();
                        if (i == PageIndex)
                        ...{
                            lb2.Enabled = false;
                            lb2.Font.Bold = true;
                            lb2.ForeColor = Color.Red;
                        }
                        else
                        ...{
                            lb2.Enabled = true;
                        }
                        lb2.RenderControl(writer);
                        writer.Write("&nbsp;");
                    }
                }
            }
            if (_lnkbtnNext != null)
            ...{
                if (_lblPageCount.Text == "")
                ...{
                    _lnkbtnNext.Enabled = false;
                }
                else
                ...{
                    int pageCount = int.Parse(_lblPageCount.Text); //获取总页数
                    if (PageIndex < pageCount)//如果当前页小于总页数，则下一页显示，否则灰显
                    ...{
                        _lnkbtnNext.Enabled = true;
                    }
                    else
                    ...{
                        _lnkbtnNext.Enabled = false;
                    }
                }
                _lnkbtnNext.RenderControl(writer);
            }
            writer.Write("&nbsp;");
            if (_lnkbtnLast != null)
            ...{
                if (_lblPageCount.Text == "")
                ...{
                    _lnkbtnLast.Enabled = false;
                }
                else
                ...{
                    int pageCount = int.Parse(_lblPageCount.Text); //获取总页数
                    if (PageIndex == pageCount)//如果当前页为最后一页，则末页灰显
                    ...{
                        _lnkbtnLast.Enabled = false;
                    }
                    else
                    ...{
                        _lnkbtnLast.Enabled = true;
                    }
                }
                _lnkbtnLast.RenderControl(writer);
            }
            writer.Write("&nbsp;&nbsp;]跳转到第");
            if (_txtPageIndex != null)
                _txtPageIndex.RenderControl(writer);
            writer.Write("页");
            if (_btnChangePage != null)
                _btnChangePage.RenderControl(writer);
            writer.RenderEndTag();
            writer.RenderEndTag();
            //base.RenderContents(writer);
        }
        #endregion
    }
}

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