//和我们上一讲讲的一样，我们先定义订阅者所感兴趣的对象，这里我们将它抽象成Action，也就是首页、下页、上页之类的动作
    public class PageChangeEventArgs : EventArgs
    {
        private string action = string.Empty;
        public string Action
        {
            get
            {
                return this.action;
            }
            set
            {
                this.action = value;
            }
        }

public PageChangeEventArgs()
        {

}

public PageChangeEventArgs(String paramAction)
        {
            this.Action = paramAction;
        }
    }

//发布者代码 也就是控件代码
    public partial class UIPageControlsNavigator : System.Web.UI.UserControl
    {
        //这里我们声明一个页面改变的委托[注：命名一定要规范]
        public delegate void PageChangeEventHandler(object sender, PageChangeEventArgs e);
        //这里我们声明一个事件
         public event PageChangeEventHandler PageChange;
        //然后以个保护类型的OnPageChange方法
         protected virtual void OnPageChange(PageChangeEventArgs e)
        {
            if (PageChange != null)
            {
                PageChange(this, e);
            }
        }

//这里就是上一讲中，具体的触发函数,这里变成了一个按钮触发事件
         protected void lbtnFirst_Click(object sender, EventArgs e)
        {
            //这时候，订阅者关心的对象e，也就是触发的是“首页”这个按钮
            OnPageChange(new PageChangeEventArgs("First"));
        }

protected void lbtnPrevious_Click(object sender, EventArgs e)
        {
            //这时候，订阅者关心的对象e，也就是触发的是“下页”这个按钮
            OnPageChange(new PageChangeEventArgs("Previous"));
        }

protected void lbtnLast_Click(object sender, EventArgs e)
        {
            OnPageChange(new PageChangeEventArgs("Last"));
        }

protected void lbtnNext_Click(object sender, EventArgs e)
        {
            OnPageChange(new PageChangeEventArgs("Next"));
        }

protected void btnSearch_Click(object sender, EventArgs e)
        {
            if (IsNumber(txtSearchPageCount.Text))
            {
                OnPageChange(new PageChangeEventArgs("Search"));
            }
        }

protected void cmbPerPage_SelectedIndexChanged(object sender, EventArgs e)
        {
            OnPageChange(new PageChangeEventArgs("PageSizeChanged"));
        } 
        
        ....

#region public void BindData(GridView myGridView, IList businessObjects, PageChangeEventArgs e)
        /// <summary>
        /// 具体控件分页功能实现
         /// </summary>
        /// <param name="myGridView">当前Grid控件</param>
        /// <param name="businessObjects">数据源</param>
        /// <param name="e">事件对象</param>
        public void BindData(GridView myGridView, IList businessObjects, PageChangeEventArgs e)
        {
            // 计算页面数
            if (businessObjects == null)
            {
                this.RowCount = 0;

}
            else
            {
                this.RowCount = businessObjects.Count;
            }

double pageCount = (double)RowCount / this.PageSize;
            this.PageCount = (int)Math.Ceiling(pageCount);
            myGridView.DataSource = businessObjects;
            myGridView.PageSize = this.PageSize;
            switch (e.Action)
            {
                case "PageLoad":
                    if (CurrentPage > 0)
                    {
                        myGridView.PageIndex = CurrentPage - 1;
                    } 
                    break;
                case "First":
                    myGridView.PageIndex = 0;
                    myGridView.EditIndex = -1;
                    break;
                case "Previous":
                    myGridView.PageIndex--;
                    myGridView.EditIndex = -1;
                    break;
                case "Next":
                    myGridView.PageIndex++;
                    myGridView.EditIndex = -1;
                    break;
                case "Last":
                    myGridView.PageIndex = this.PageCount - 1;
                    myGridView.EditIndex = -1;
                    break;
                case "PageSizeChanged":
                    myGridView.PageIndex = 0;
                    myGridView.EditIndex = -1;
                    break;
                case "Search":
                    myGridView.PageIndex = int.Parse(txtSearchPageCount.Text) - 1;
                    break;
                case "Refresh":
                    break;
                default:
                    myGridView.PageIndex = 0;
                    break;
            }
            // 页数不够了，进行调整
            if (myGridView.PageIndex >= this.PageCount)
            {
                myGridView.PageIndex = this.PageCount == 0 ? 0 : this.PageCount - 1;
            }
            myGridView.DataBind();
            // 获取按钮的状态
            this.GetButtonState(myGridView);
        }
        #endregion   
    }

    //角色管理页面代码类
    public partial class RoleManage : BasePage
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            //在当前页面订阅控件的点击事件
            this.myNavigator.PageChange += new PageChangeEventHandler(this.myNavigator_PageChange);
            if (!Page.IsPostBack)
            {

}
        }
        
        //具体的点击触发函数功能，这里就是控件的分页
        private void myNavigator_PageChange(object sender, PageChangeEventArgs e)
        {
            this.GetAllRoles(e);
        }

private void GetAllRoles(PageChangeEventArgs e)
        {
            try
            {
                //角色数据源
                roles = roleService.GetAllRoles();
                //调用控件的分页功能函数，这个封装在分页控件里可以，封装在通用的类库里也行
                this.myNavigator.BindData(this.grdRole, roles, e);
                
            }
            catch (Exception myException)
            {
                return;
            }
        }
}

public partial class ApprovalResults : System.Web.UI.UserControl
{
  //EventHandler是微软默认的委托，在本例中我们直接就用EventHandler来表示委托，当然它的参数是Sender,e
  public event EventHandler Preview;
  public event EventHandler Submit;
  public event EventHandler FMOK;
  public event EventHandler FMProgress;
  public event EventHandler FMSave;

...
  //提交按钮事件
  protected void btnSubmit_Click(object sender, EventArgs e)
  {
    try
     {
      //触发我们定义的事件
      Submit(sender, e);
     }
     catch (Exception ex)
     {
     ...
     }
  }

...
}

    public partial class Preview : BasePage
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            ...
            //在次页面中订阅审批控件的提交按钮事件
            ApprovalResults1.Submit += new EventHandler(ApprovalResults1_Submit);
        }
        
        //具体的提交事件功能函数
        public void ApprovalResults1_Submit(object sender, EventArgs e)
        {            
            try
            {                
            }
            catch (Exception ex)
            {               
            }
            finally
            {             
            }
        }
    }