public partial class PagerControl : UserControl {#region 构造函数public PagerControl() {InitializeComponent();}#endregion#region 分页字段和属性private int pageIndex = 1;/// <summary>/// 当前页面/// </summary>public virtual int PageIndex {get { return pageIndex; }set { pageIndex = value; }}private int pageSize = 1;/// <summary>/// 每页记录数/// </summary>public virtual int PageSize {get { return pageSize; }set { pageSize = value; }}private int recordCount = 0;/// <summary>/// 总记录数/// </summary>public virtual int RecordCount {get { return recordCount; }set { recordCount = value; }}private int pageCount = 0;/// <summary>/// 总页数/// </summary>public int PageCount {get {if (pageSize != 0) {pageCount = GetPageCount();}return pageCount;}}/// <summary>/// 计算总页数/// </summary>/// <returns></returns>private int GetPageCount() {if (PageSize == 0) {return 0;}int pageCount = RecordCount / PageSize;if (RecordCount % PageSize == 0) {pageCount = RecordCount / PageSize;}else {pageCount = RecordCount / PageSize + 1;}return pageCount;}#endregionpublic event EventHandler OnPageChanged;/// <summary>/// 外部调用/// </summary>public void DrawControl(int count) {recordCount = count;DrawControl(false);}/// <summary>/// 页面控件呈现/// </summary>private void DrawControl(bool callEvent) {this.GoItem.Text = "跳转";this.CurrentItem.Text = PageIndex.ToString();this.TolCountItem.Text = RecordCount.ToString();this.PageSizeItem.Text = PageSize.ToString();if (callEvent && OnPageChanged != null) {OnPageChanged(this, null);//当前分页数字改变时，触发委托事件
            }SetFormCtrEnabled();if (PageCount == 1)//有且仅有一页
            {this.MoveFirstItem.Enabled = false;this.MovePreviousItem.Enabled = false;this.MoveNextItem.Enabled = false;this.MoveLastItem.Enabled = false;}else if (PageIndex == 1)//第一页
            {this.MoveFirstItem.Enabled = false;this.MovePreviousItem.Enabled = false;}else if (PageIndex == PageCount)//最后一页
            {this.MoveNextItem.Enabled = false;this.MoveLastItem.Enabled = false;}}/// <summary>/// 设置控件可用性/// </summary>private void SetFormCtrEnabled() {this.CurrentItem.Enabled = true;this.MoveFirstItem.Enabled = true;this.MovePreviousItem.Enabled = true;this.MoveNextItem.Enabled = true;this.MoveLastItem.Enabled = true;this.GoItem.Enabled = true;}/// <summary>/// 首页/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void MoveFirstItem_Click(object sender, EventArgs e) {PageIndex = 1;DrawControl(true);}/// <summary>/// 上一页/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void MovePreviousItem_Click(object sender, EventArgs e) {PageIndex = Math.Max(1, PageIndex - 1);DrawControl(true);}/// <summary>/// 下一页/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void MoveNextItem_Click(object sender, EventArgs e) {PageIndex = Math.Min(PageCount, PageIndex + 1);DrawControl(true);}/// <summary>/// 末页/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void MoveLastItem_Click(object sender, EventArgs e) {PageIndex = PageCount;DrawControl(true);}/// <summary>/// 跳转/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void GoItem_Click(object sender, EventArgs e) {int num = 0;if (int.TryParse(this.CurrentItem.Text.Trim(), out num) && num > 0) {PageIndex = num;DrawControl(true);}}/// <summary>/// 跳转页数限制/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void CurrentItem_TextChanged(object sender, EventArgs e) {int num = 0;if (int.TryParse(this.CurrentItem.Text.Trim(), out num) && num > 0) {if (num > PageCount) {this.CurrentItem.Text = PageCount.ToString();}}}/// <summary>/// 页数Enter键/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void CurrentItem_KeyPress(object sender, KeyPressEventArgs e) {GoItem_Click(null, null);}private bool isTextChanged = false;/// <summary>/// 页数改变事件/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void PageSizeItem_TextChanged(object sender, EventArgs e) {int num = 0;if (!int.TryParse(this.PageSizeItem.Text.Trim(), out num) || num <= 0) {num = 20;this.PageSizeItem.Text = "20";}else {isTextChanged = true;}pageSize = num;}/// <summary>/// 页数Enter事件/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void PageSizeItem_KeyPress(object sender, KeyPressEventArgs e) {if (e.KeyChar == System.Convert.ToChar(13)) {if (isTextChanged) {isTextChanged = false;MoveFirstItem_Click(null, null);}}}} 

        /// <summary>/// 加载数据/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void SelectForm_Load(object sender, EventArgs e) {LoadData();pagerControl1.OnPageChanged += new EventHandler(pagerControl1_OnPageChanged);}/// <summary>/// 分页控件改变事件/// </summary>/// <param name="sender"></param>/// <param name="e"></param>void pagerControl1_OnPageChanged(object sender, EventArgs e) {LoadData();}/// <summary>/// 加载数据    /// </summary>/// <param name="index"></param>/// <param name="pagesize"></param>private void LoadData() {List<Template> templateList = new List<Template>();HttpHelper http = new HttpHelper();string url = string.Format("https://www.baidu.com?page={0}&pagecount={1}", this.pagerControl1.PageIndex, this.pagerControl1.PageSize);string result = http.CollectHtml(url, "", HttpHelper.Method.GET, HttpHelper.HtmlEncoding.UTF8, HttpHelper.HtmlEncoding.UTF8);var resultData = JsonConvert.DeserializeObject<JObject>(result);//分页信息if (resultData["flipinfo"] != null) {Page page = JsonConvert.DeserializeObject<Page>(resultData["flipinfo"].ToString());if (page != null) {pagerControl1.DrawControl(page.total);}}}