[原]asp.net自定义分页用户控件

控件界面

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UserControl后台相关代码

注册事件

 

// Event fired when user click button on user control
public event System.EventHandler ButtonClicked;

 

触发事件

 

if (ButtonClicked != null)
            {
                ButtonClicked(this, EventArgs.Empty);
            }

 

绑定下拉框中的总页数

 

/// <summary>
        /// use this property to bind the page count of DropDownList
        /// </summary>
        public int SelectedIndex
        {
            get { return this.ddlPageCount.SelectedIndex; }
            set { 

                // page count
                int itemCount = 0;

                // calculate the page count
                if (pageCount > 0 && pageRows > 0)
                {
                    
                    double totalCount = pageCount;
                    double rows = pageRows;
                    itemCount = Convert.ToInt32(Math.Ceiling(totalCount / rows));
                    itemCount = (itemCount == 0) ? 1 : itemCount;
                }

                if (itemCount != this.ddlPageCount.Items.Count)
                {
                    BindDDL(itemCount, pageRows);
                }

                
                this.ddlPageCount.Enabled = (this.ddlPageCount.Items.Count > 0);

                ddlPageCount.SelectedIndex = value; 

                if (this.ddlPageCount.Items.Count <= 1)
                {
                    this.lbnPrevious.Enabled = false;
                    this.lbnNext.Enabled = false;
                }
                else if (this.ddlPageCount.SelectedIndex == 0)
                {
                    this.lbnPrevious.Enabled = false;
                    this.lbnNext.Enabled = true;
                }
                else if (this.ddlPageCount.SelectedIndex == this.ddlPageCount.Items.Count - 1)
                {
                    this.lbnPrevious.Enabled = true;
                    this.lbnNext.Enabled = false;
                }
            }
        }

 

 

/// <summary>
        /// bind the page count to the DropDownList
        /// </summary>
        /// <param name="itemCount">page count</param>
        /// <param name="pageRows">how many rows in one page</param>
        private void BindDDL(int itemCount, int pageRows)
        {

            while (this.ddlPageCount.Items.Count < itemCount)
            {
                int index = this.ddlPageCount.Items.Count;
                int item = index + 1;
                this.ddlPageCount.Items.Insert(index, item.ToString());
            }

            while (this.ddlPageCount.Items.Count > itemCount)
            {
                int index = this.ddlPageCount.Items.Count - 1;
                this.ddlPageCount.Items.RemoveAt(index);
            }

        }

 

选择页

 

 

/// <summary>
        /// previous page
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void lbnPrevious_Click(object sender, System.EventArgs e)
        {
            if (this.ddlPageCount.Items.Count == 0)
            {
                return;
            }


            if (this.ddlPageCount.SelectedIndex > 0)
            {
                this.ddlPageCount.SelectedIndex -= 1;
                    
                this.lbnPrevious.Enabled = (this.ddlPageCount.SelectedIndex != 0);

                this.lbnNext.Enabled = (currentPage != this.ddlPageCount.Items.Count);
                    
            }

            currentPage = this.ddlPageCount.SelectedIndex + 1;


            if (ButtonClicked != null)
            {
                ButtonClicked(this, EventArgs.Empty);
            }
        }


        /// <summary>
        /// next page
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void lbnNext_Click(object sender, System.EventArgs e)
        {
            if (this.ddlPageCount.Items.Count == 0)
            {
                return;
            }

            if (this.ddlPageCount.SelectedIndex < this.ddlPageCount.Items.Count - 1)
            {
                this.ddlPageCount.SelectedIndex += 1;

                this.lbnPrevious.Enabled = (this.ddlPageCount.SelectedIndex != 0);

                this.lbnNext.Enabled = (this.ddlPageCount.SelectedIndex != this.ddlPageCount.Items.Count - 1);
            }

            currentPage = this.ddlPageCount.SelectedIndex + 1;

            if (ButtonClicked != null)
            {
                ButtonClicked(this, EventArgs.Empty);
            }
        }


        /// <summary>
        /// go to the destination page
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ddlPageCount_SelectedIndexChanged(object sender, System.EventArgs e)
        {
            if (this.ddlPageCount.Items.Count == 0)
            {
                return;
            }

            currentPage = this.ddlPageCount.SelectedIndex + 1;
                
            this.lbnPrevious.Enabled = (currentPage != 1);

            this.lbnNext.Enabled = (currentPage != this.ddlPageCount.Items.Count);
            
            if (ButtonClicked != null)
            {
                ButtonClicked(this, EventArgs.Empty);
            }
        }

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主页面相关代码

查询按钮

 

/// <summary>
        /// query data
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnQuery_Click(object sender, System.EventArgs e)
        {
            int count = 0;
            if (txtCondition.Text.Trim().Length > 0)
            {
                count = int.Parse(txtCondition.Text.Trim());
            }

            // initial parameters
            DataPager dpPager = ((DataPager)this.Page.FindControl("DataPager1"));
            dpPager.CurrentPage = 1;
            dpPager.PageCount = count; // retrived data rows
            dpPager.PageRows = 14;    // how many rows in one page
            dpPager.SelectedIndex = 0; 

            //bind datagrid
        }

 

绑定用户控件事件

前台

 

Code

<%@ Register TagPrefix="uc1" TagName="DataPager" Src="DataPager.ascx" %>

<uc1:DataPager id="DataPager1" runat="server" OnButtonClicked="DataPager_Changed"></uc1:DataPager>

 

后台

 

/// <summary>
        /// fire to bind data with selected page
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void DataPager_Changed(object sender, System.EventArgs e)
        {
            DataPager dpPager = (sender as DataPager);
            int currentPage = dpPager.CurrentPage;
            
            //bind datagrid
        }