winform 分页控件源码

using System;using System.Collections.Generic;using System.ComponentModel;using System.Drawing;using System.Data;using System.Data.SqlClient;using System.Text;using System.Windows.Forms;namespace WindowsApp.MyControl{ /// <summary> /// 申明委托 /// </summary> /// <param name="e"></param> /// <returns></returns> public delegate int EventPagingHandler(EventPagingArg e); /// <summary> /// 分页控件呈现 /// </summary> public partial class Pager : UserControl { public Pager() { InitializeComponent(); } public event EventPagingHandler EventPaging; /// <summary> /// 每页显示记录数 /// </summary> private int _pageSize = 20; /// <summary> /// 每页显示记录数 /// </summary> public int PageSize { get { return _pageSize; } set { _pageSize = value; GetPageCount(); } } private int _nMax = 0; /// <summary> /// 总记录数 /// </summary> public int NMax { get { return _nMax; } set { _nMax = value; GetPageCount(); } } private int _pageCount = 0; /// <summary> /// 页数=总记录数/每页显示记录数 /// </summary> public int PageCount { get { return _pageCount; } set { _pageCount = value; } } private int _pageCurrent = 0; /// <summary> /// 当前页号 /// </summary> public int PageCurrent { get { return _pageCurrent; } set { _pageCurrent = value; } } public BindingNavigator ToolBar { get { return this.bindingNavigator; } } private void GetPageCount() { if (this.NMax > 0) { this.PageCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(this.NMax) / Convert.ToDouble(this.PageSize))); } else { this.PageCount = 0; } } /// <summary> /// 翻页控件数据绑定的方法 /// </summary> public void Bind() { if (this.EventPaging != null) { this.NMax = this.EventPaging(new EventPagingArg(this.PageCurrent)); } if (this.PageCurrent > this.PageCount) { this.PageCurrent = this.PageCount; } if (this.PageCount == 1) { this.PageCurrent = 1; } lblPageCount.Text = this.PageCount.ToString(); this.lblMaxPage.Text = "共" this.NMax.ToString() "条记录"; this.txtCurrentPage.Text = this.PageCurrent.ToString(); if (this.PageCurrent == 1) { this.btnPrev.Enabled = false; this.btnFirst.Enabled = false; } else { btnPrev.Enabled = true; btnFirst.Enabled = true; } if (this.PageCurrent == this.PageCount) { this.btnLast.Enabled = false; this.btnNext.Enabled = false; } else { btnLast.Enabled = true; btnNext.Enabled = true; } if (this.NMax == 0) { btnNext.Enabled = false; btnLast.Enabled = false; btnFirst.Enabled = false; btnPrev.Enabled = false; } } private void btnFirst_Click(object sender, EventArgs e) { PageCurrent = 1; this.Bind(); } private void btnPrev_Click(object sender, EventArgs e) { PageCurrent -= 1; if (PageCurrent <= 0) { PageCurrent = 1; } this.Bind(); } private void btnNext_Click(object sender, EventArgs e) { this.PageCurrent = 1; if (PageCurrent > PageCount) { PageCurrent = PageCount; } this.Bind(); } private void btnLast_Click(object sender, EventArgs e) { PageCurrent = PageCount; this.Bind(); } private void btnGo_Click(object sender, EventArgs e) { if (this.txtCurrentPage.Text != null && txtCurrentPage.Text != "") { if (Int32.TryParse(txtCurrentPage.Text, out _pageCurrent)) { this.Bind(); } else { //Common.MessageProcess.ShowError("输入数字格式错误！"); MessageBox.Show("输入数字格式错误"); } } } private void txtCurrentPage_KeyDown(object sender, KeyEventArgs e) { if (e.KeyCode == Keys.Enter) { this.Bind(); } } } /// <summary> /// 自定义事件数据基类 /// </summary> public class EventPagingArg : EventArgs { private int _intPageIndex; public EventPagingArg(int PageIndex) { _intPageIndex = PageIndex; } }}