一個簡單的ASP.MVC分頁控件

分頁功能實現方面參考了網上的一些內容，加上自己的一些修改，使用方式如 下：

(鑒於分頁代碼基本上和別人的沒什麼兩樣，所以這裡就省略了。)

封裝擴展方法

public static string Pager(this HtmlHelper html, IPageData model, bool alwaysShow,bool showNumber)
        {
            string text = "<!--沒有任何數據,所以不顯示分頁控件-->";
            bool show = model.TotalCount > 0 && alwaysShow || model.TotalCount > model.PageSize;
            if (show)
            {
                StringBuilder sb = new StringBuilder();
                var reqUrl = html.ViewContext.RequestContext.HttpContext.Request.Url.ToString();
                string link = "";
                if (reqUrl.IndexOf("page") >= 0)
                {
                    Regex re = new Regex(@"page=(\d+)", RegexOptions.IgnoreCase);
                    link = re.Replace(reqUrl, "page=%7Bpage%7D");
                }
                else if (reqUrl.IndexOf("?") < 0)
                {
                    link = reqUrl + "?page=%7Bpage%7D";
                }
                else
                {
                    link = reqUrl + "&page=%7Bpage%7D";
                }
                #region 生成四個按鈕
                TagBuilder root = new TagBuilder("div");
                root.AddCssClass("ZuiePager");                
                TagBuilder fBtn = new TagBuilder("a");
                fBtn.AddCssClass("btn");
                fBtn.MergeAttribute("style", "font-family:Webdings;");
                fBtn.InnerHtml = "9";
                TagBuilder pBtn = new TagBuilder("a");
                pBtn.AddCssClass("btn");
                pBtn.MergeAttribute("style", "font-family:Webdings;");
                pBtn.InnerHtml = "3";
                TagBuilder nBtn = new TagBuilder("a");
                nBtn.AddCssClass("btn");
                nBtn.MergeAttribute("style", "font-family:Webdings;");
                nBtn.InnerHtml = "4";
                TagBuilder lBtn = new TagBuilder("a");
                lBtn.AddCssClass("btn");
                lBtn.MergeAttribute("style", "font-family:Webdings;");
                lBtn.InnerHtml = ":";
                #endregion
                int p = model.PageIndex;
                #region 判斷首尾頁
                if (model.HasPreviousPage)
                {
                    string pUrl = link.Replace("%7Bpage%7D", (p - 1).ToString());
                    string fUrl = link.Replace("%7Bpage%7D", (1).ToString());
                    fBtn.MergeAttribute("href", fUrl);
                    pBtn.MergeAttribute("href", pUrl);
                }
                else
                {
                    fBtn.MergeAttribute("disabled", "disabled");
                    pBtn.MergeAttribute("disabled", "disabled");
                }
                if (model.HasNextPage)
                {
                    string nUrl = link.Replace("%7Bpage%7D", (p + 1).ToString());
                    string lUrl = link.Replace("%7Bpage%7D", model.TotalPages.ToString());
                    nBtn.MergeAttribute("href", nUrl);
                    lBtn.MergeAttribute("href", lUrl);
                }
                else
                {
                    nBtn.MergeAttribute("disabled", "disabled");
                    lBtn.MergeAttribute("disabled", "disabled");
                }
                #endregion
                sb.Append(fBtn.ToString());
                sb.Append(pBtn.ToString());
                #region 生成中間數字
                if (showNumber)
                {
                    int begin = p - 5;
                    int end = p + 5;
                    if (begin < 1)
                    {
                        begin = 1;
                        end = 11;
                    }
                    if (end > model.TotalPages)
                    {
                        end = model.TotalPages;
                        begin = end > 11 ? end - 10 : 1;
                    }
                    for (int i = begin; i <= end; i++)
                    {
                        TagBuilder num = new TagBuilder("span");
                        if (p == i)
                        {
                            num.AddCssClass("current");
                            num.InnerHtml = i.ToString();
                        }
                        else
                        {
                            string url = link.Replace("%7Bpage%7D", i.ToString());
                            num.AddCssClass("num");
                            TagBuilder a = new TagBuilder("a");
                            a.MergeAttribute("href", url);
                            a.InnerHtml = i.ToString();
                            num.InnerHtml = a.ToString()+" ";
                        }
                        sb.Append(num.ToString());
                    }
                }
                #endregion
                sb.Append(nBtn.ToString());
                sb.Append(lBtn.ToString());
                #region 生成頁信息
                TagBuilder index = new TagBuilder("span");
                index.AddCssClass("num");
                index.InnerHtml = p.ToString();
                TagBuilder pagecount = new TagBuilder("span");
                pagecount.AddCssClass("num");
                pagecount.InnerHtml = model.TotalPages.ToString();
                TagBuilder pagesize = new TagBuilder("span");
                pagesize.AddCssClass("num");
                pagesize.InnerHtml = model.PageSize.ToString();
                TagBuilder count = new TagBuilder("span");
                count.AddCssClass("num");
                count.InnerHtml = model.TotalCount.ToString();
                sb.Append(string.Format(" 第{0}頁/共{1}頁 每頁{2}條記錄 合計{3}條", index.ToString(), pagecount.ToString(), pagesize.ToString(), count.ToString()));
                root.InnerHtml = sb.ToString();
                text = root.ToString();
                #endregion
            }
            return text;
        }