.net分頁控件

.net分頁控件

  public class CPager2 : WebControl
     {
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public CPager2()
        {
            FirstImage = "../image/backward24.gif";
            PreviousImage = "../image/back24.gif";
            NextImage = "../image/next24.gif";
            EndImage = "../image/forward24.gif";

            FirstImage2 = "../image/backward24-gray.gif";
            PreviousImage2 = "../image/back24-gray.gif";
            NextImage2 = "../image/next24-gray.gif";
            EndImage2 = "../image/forward24-gray.gif";
            CreatePage();
        }



        #region 創始
        private void CreatePage()
        {
            this.CssClass = "Page2";

            
            //第一頁
            ImageButton FirstBtn = new ImageButton();
            FirstBtn.ID = "First";
            FirstBtn.CommandName = "First";
            FirstBtn.CssClass = "PageButton";
            FirstBtn.ImageUrl = FirstImage;
            this.Controls.Add(FirstBtn);
            FirstBtn.Enabled = false;
            FirstBtn.Command += new CommandEventHandler(Button_Command);

            ImageButton preBtn = new ImageButton();
            preBtn.ID = "Previous";
            preBtn.CommandName = "Previous";
            preBtn.CssClass = "PageButton";
            preBtn.ImageUrl = PreviousImage;
            this.Controls.Add(preBtn);
            preBtn.Enabled = false;
            preBtn.Command += new CommandEventHandler(Button_Command);

            //----------------------------------------------------------------------------------------------------------------
            //下一頁
            ImageButton nextBtn = new ImageButton();
            nextBtn.ID = "Next";
            nextBtn.CommandName = "Next";
            nextBtn.CssClass = "PageButton";
            this.Controls.Add(nextBtn);
            nextBtn.ImageUrl = NextImage;
            nextBtn.Command += new CommandEventHandler(Button_Command);

            ImageButton EndBtn = new ImageButton();
            EndBtn.ID = "End";
            EndBtn.CommandName = "End";
            EndBtn.CssClass = "PageButton";
            EndBtn.ImageUrl = EndImage;
            this.Controls.Add(EndBtn);
            EndBtn.Command += new CommandEventHandler(Button_Command);

            DropDownList drp = new DropDownList();
            drp.AutoPostBack = true;
            drp.ID = "ddlGo";
            drp.CssClass = "PageGo";
            this.Controls.Add(drp);
            drp.SelectedIndexChanged += new EventHandler(drp_SelectedIndexChanged);


        }

        #region Command
        void Button_Command(object sender, CommandEventArgs e)
        {
            PageChangedEventArgs ex = new PageChangedEventArgs();
            ex.OldPageIndex = PageIndex;

            switch (e.CommandName)
            {
                case "First":
                    PageIndex = 0;
                    break;
                case "Next":
                    PageIndex = PageIndex + 1;
                    break;
                case "Previous":
                    PageIndex = PageIndex - 1;
                    break;
                case "End":
                    PageIndex = PageTotal - 1;
                    break;
            }

            PageButtonStatus();

            ex.NewPageIndex = PageIndex;
            OnPageIndexChange(ex);

        }
        #endregion
        #region 設置狀態
        private void PageButtonStatus()
        {
            if (PageIndex <= 0)
            {
                ((ImageButton)this.FindControl("First")).Enabled = false;
                ((ImageButton)this.FindControl("Previous")).Enabled = false;

                ((ImageButton)this.FindControl("First")).ImageUrl = FirstImage2;
                ((ImageButton)this.FindControl("Previous")).ImageUrl = PreviousImage2;
            }
            else
            {
                ((ImageButton)this.FindControl("First")).Enabled = true;
                ((ImageButton)this.FindControl("Previous")).Enabled = true;

                ((ImageButton)this.FindControl("First")).ImageUrl = FirstImage;
                ((ImageButton)this.FindControl("Previous")).ImageUrl = PreviousImage;
            }
            if (PageIndex >= PageTotal - 1)
            {
                ((ImageButton)this.FindControl("Next")).Enabled = false;
                ((ImageButton)this.FindControl("End")).Enabled = false;

                ((ImageButton)this.FindControl("Next")).ImageUrl = NextImage2;
                ((ImageButton)this.FindControl("End")).ImageUrl = EndImage2;
            }
            else
            {
                ((ImageButton)this.FindControl("Next")).Enabled = true;
                ((ImageButton)this.FindControl("End")).Enabled = true;

                ((ImageButton)this.FindControl("End")).ImageUrl = EndImage;
                ((ImageButton)this.FindControl("Next")).ImageUrl = NextImage;
            }

            DropDownList ddlGo = (DropDownList)FindControl("ddlGo");
            ddlGo.Items.Clear();
            for (int i = 1; i <=PageTotal; i++)
            {
                ddlGo.Items.Add(i.ToString());
            }
            if(PageTotal>0)
                ddlGo.SelectedIndex = PageIndex;
        }
        #endregion

        void drp_SelectedIndexChanged(object sender, EventArgs e)
        {
            PageChangedEventArgs ex = new PageChangedEventArgs();
            ex.OldPageIndex = PageIndex;
            DropDownList ddlGo = (DropDownList)FindControl("ddlGo");
            PageIndex = ddlGo.SelectedIndex;
            PageButtonStatus();

            ex.NewPageIndex = PageIndex;
            OnPageIndexChange(ex);

        }
        #endregion

        #region 屬性

        [Description("當前頁")]
        public int PageIndex
        {
            get
            {
                int temp = 0;
                if (ViewState["PageIndex"] != null)
                    temp = Convert.ToInt32(ViewState["PageIndex"]);
                return temp;
            }
            set
            {
                ViewState["PageIndex"] = value;
            }
        }

        /// <summary>
        /// 設置總頁數
        /// </summary>
        [Description("總頁數")]
        public int PageTotal
        {
            get
            {
                if (ViewState["PageTotal"] != null)
                    return Convert.ToInt32((ViewState["PageTotal"]));
                else
                    return 0;
            }
            set
            {
                ViewState["PageTotal"] = value;
                
                this.PageButtonStatus();

            }
        }
        [Category("設置圖片")]
        [Description("第一頁圖片")]
        public string FirstImage
        {
            get
            {
                string temp = "";
                if (ViewState["FirstImage"] != null)
                    temp = Convert.ToString(ViewState["FirstImage"]);
                return temp;
            }
            set
            {
                ViewState["FirstImage"] = value;
            }
        }
        [Category("設置圖片")]
        [Description("上一頁圖片")]
        public string PreviousImage
        {
            get
            {
                string temp = "";
                if (ViewState["PriviousImage"] != null)
                    temp = Convert.ToString(ViewState["PriviousImage"]);
                return temp;
            }
            set
            {
                ViewState["PriviousImage"] = value;
            }
        }
        [Category("設置圖片")]
        [Description("下一頁圖片")]
        public string NextImage
        {
            get
            {
                string temp = "";
                if (ViewState["NextImage"] != null)
                    temp = Convert.ToString(ViewState["NextImage"]);
                return temp;
            }
            set
            {
                ViewState["NextImage"] = value;
            }
        }
        [Category("設置圖片")]
        [Description("末頁圖片")]
        public string EndImage
        {
            get
            {
                string temp = "";
                if (ViewState["EndImage"] != null)
                    temp = Convert.ToString(ViewState["EndImage"]);
                return temp;
            }
            set
            {
                ViewState["EndImage"] = value;
            }
        }

        [Category("設置圖片")]
        [Description("第一頁圖片")]
        public string FirstImage2
        {
            get
            {
                string temp = "";
                if (ViewState["FirstImage2"] != null)
                    temp = Convert.ToString(ViewState["FirstImage2"]);
                return temp;
            }
            set
            {
                ViewState["FirstImage2"] = value;
            }
        }
        [Category("設置圖片")]
        [Description("上一頁圖片")]
        public string PreviousImage2
        {
            get
            {
                string temp = "";
                if (ViewState["PriviousImage2"] != null)
                    temp = Convert.ToString(ViewState["PriviousImage2"]);
                return temp;
            }
            set
            {
                ViewState["PriviousImage2"] = value;
            }
        }
        [Category("設置圖片")]
        [Description("下一頁圖片")]
        public string NextImage2
        {
            get
            {
                string temp = "";
                if (ViewState["NextImage2"] != null)
                    temp = Convert.ToString(ViewState["NextImage2"]);
                return temp;
            }
            set
            {
                ViewState["NextImage2"] = value;
            }
        }
        [Category("設置圖片")]
        [Description("末頁圖片")]
        public string EndImage2
        {
            get
            {
                string temp = "";
                if (ViewState["EndImage2"] != null)
                    temp = Convert.ToString(ViewState["EndImage2"]);
                return temp;
            }
            set
            {
                ViewState["EndImage2"] = value;
            }
        }

        #endregion

        #region 事件
        public delegate void PageChangedEventHandler(object sender, PageChangedEventArgs e);
        public event PageChangedEventHandler PageIndexChanged;
        protected virtual void OnPageIndexChange(PageChangedEventArgs e)
        {
            if (PageIndexChanged != null)
                PageIndexChanged(this, e);
        }



       #endregion

    }