Windows Form 分页 具体实现

using system;
using system.collections.generic;
using system.componentmodel;
using system.drawing;
using system.data;
using system.linq;
using system.text;
using system.windows.forms;
using system.data.common;
using system.collections;

namespace common
{
    public partial class winformpager : usercontrol
    {
        public event eventhandler pagechanged; //事件：控件的当前页码发生变更。 
        private int pagesize;
        private int curpage;
        private int pagecount;
        public winformpager()
        {
            initializecomponent(); 
        }

        private void winformpager_load(object sender, eventargs e)
        {
        }
        /// <summary> 
        /// [属性]每页显示记录数。 
        /// </summary>
        public int pagesize
        {
            get
            {
                if (pagesize <= 0)
                {
                    pagesize = 10;
                }
                return pagesize;
            }
            set
            {
                pagesize = value;
            }
        }

        /// <summary> 
        /// 当前页数 
        /// </summary> 
        public int curpage
        {
            get
            {
                if (curpage <= 0)
                {
                    curpage = 1;
                }
                return curpage;
            }
            set
            {
                curpage = value;
                if (pagechanged != null)
                {
                    saferaise.raise(pagechanged,null);//触发当件页码变更事件。 
                }
            }
        }
        /// <summary> 
        /// [属性]总页数。 
        /// </summary> 
        public int pagecount
        {
            get
            {
                if (recordcount > 0)
                {
                    int pagecount = recordcount / pagesize;
                    if (recordcount % pagesize == 0)
                    {
                      pagecount = recordcount / pagesize;
                    }

                    else
                    {
                        pagecount = recordcount / pagesize + 1;
                    }
                    return pagecount;
                }
                else
                {
                    return 0;
                }
            }
            set
            {
                pagecount = value;
            }
        }

        /// <summary> 
        /// [属性]总记录数。 
        /// </summary> 
        public int recordcount
        {
            get;
            set;
        }

        /// <summary> 
        /// [属性]相对于当前页的上一页 
        /// </summary> 
        public int prevpage
        {
            get
            {
                if (curpage > 1)
                {
                    return curpage - 1;
                }
                return 1;
            }
        }

        /// <summary> 
        /// [属性]相对于当前页的下一页 
        /// </summary> 
        public int nextpage
        {
            get
            {
                if (curpage < pagecount)
                {
                    return curpage + 1;
                }
                return pagecount;
            }
        }

        private void btnfirstpage_click(object sender, eventargs e)
        {
            this.curpage = 1;
        }

        private void btnlastpage_click(object sender, eventargs e)
        {
            this.curpage = this.prevpage;
        }

        private void btnnextpage_click(object sender, eventargs e)
        {
            this.curpage = this.nextpage;
        }

        private void btnendpage_click(object sender, eventargs e)
        {
            this.curpage = this.pagecount;
        }

        private void txtpagenumber_textchanged(object sender, eventargs e)
        {
            if (!validator.isnumeric(this.txtpagenumber.text.trim()))
            {
                messagebox.show("请输入数字！");
            }
        }

        private void btnjump_click(object sender, eventargs e)
        {

            if (!validator.isnumeric(this.txtpagenumber.text.trim()))//验证输入是否为数字
            {
                messagebox.show("请输入数字！");
            }
            else
            {
                if (int.parse(this.txtpagenumber.text.trim()) > 0)
                {
                    if (int.parse(this.txtpagenumber.text.trim()) < this.pagecount)
                    {
                        this.curpage = int.parse(this.txtpagenumber.text.trim());
                    }
                    else
                    {
                        this.curpage = this.pagecount;
                    }
                }
                else
                {
                    this.curpage = 1;
                }
            }
        } 
    }
}

该用户自定义控件在页面中取名pager

private void binddata()
{
    int rowcount = 0;
    pager.pagesize = 15;    datagridview.datasource = getlist(pager.curpage, pager.pagesize, out rowcount);
    pager.recordcount = rowcount;
    pager.lbnumber.text = string.format("共{0}条记录，每页{1}条记录，共{2}页", pager.recordcount.tostring(), pager.pagesize.tostring(), pager.pagecount.tostring());
}

private void pager_pagechanged(object sender, eventargs e)
{
    binddata(); //重新对datagridview控件的数据源进行绑定。
}

控件