ASP.NET MVC分页

之前写了一个关于ASP.NET MVC+妹子UI的Ajax分页控件，今天在那个控件的基础上，抽出了一个后台的分页控件，特此与大家分享

 public class PageFactory
    {

        public PageFactory( string Controller, string Action, int Total, int limit,string Area=""
            ,Dictionary<string,string> Parameter=null)
        {
            this._controller = Controller;
            this._action = Action;
            this._area = Area;
            Url = "/" + _area + "/"+this._controller + "/" + this._action + "?"+_assemblyParameter(Parameter)+"offset=";
            _totalBars = Convert.ToInt32(Math.Ceiling((double)(Total *1.0f/ limit)));
        }



        public PageFactory(string Controller, string Action, int Total, int limit,string Area="")
        {
            this._controller = Controller;
            this._action = Action;
            Url = "/" + this._controller + "/" + this._action + "?offset=";
            _totalBars = Convert.ToInt32(Math.Ceiling((double)(Total*1.0f / limit)));
        }

        private string _area;

        private string _action;

        private string _controller;

        /// <summary>
        /// 增加参数方法
        /// </summary>
        /// <param name="Parameter"></param>
        /// <returns></returns>
        private string _assemblyParameter(Dictionary<string, string> Parameter)
        {
            if (Parameter == null || Parameter.Count == 0)
            {
                return "";
            }

            StringBuilder assem = new StringBuilder();

            foreach (var item in Parameter)
            {
                assem.Append(item.Key + "=" + item.Value+"&");
            }
            return assem.ToString();
        }

        private string Url;

        private int _totalBars;

        /// <summary>
        /// 初始化方法
        /// </summary>
        /// <returns></returns>
        private MvcHtmlString _init()
        {

            StringBuilder htmlSb = new StringBuilder();

            htmlSb.Append("<li class=\"am-disabled\"><a href=\"javascript:;\">«</a></li>");
            //上一页,（禁用的效果） 
            string nextBar = this._totalBars > 1 ? "<li><a href=\"" + this.Url + 2 + "\">»</a></li>" : "<li class=\"am-disabled\"><a href=\"javascript:;\">»</a></li>";
            //最后一页
            htmlSb.Append("<li class=\"am-active\"><a href=\"" + Url + 1 + "\">1</a></li>");

            if (_totalBars <= 7)
            {
                for (var i = 1; i < _totalBars; i++)
                {
                    htmlSb.Append("<li><a href=\"" + Url + (i + 1) + "\">" + (i + 1) + "</a></li>");
                }
            }
            else
            {
                for (var j = 1; j < 5; j++)
                {
                    htmlSb.Append("<li><a href=\"" + Url + (j + 1) + "\">" + (j + 1) + "</a></li>");
                }
                htmlSb.Append("<li><a href=\"javascript:;\">...</a></li>");
                htmlSb.Append("<li><a href=\"" + Url + (_totalBars) + "\">" + (_totalBars) + "</a></li>");
            }
            htmlSb.Append(nextBar);
            return new MvcHtmlString(htmlSb.ToString());
        }


        /// <summary>
        /// 核心方法
        /// </summary>
        /// <param name="offset"></param>
        /// <returns></returns>
        public MvcHtmlString Core(int offset)
        {

            if (offset == 0)
            {
                return this._init();
            }

            StringBuilder htmlHelper = new StringBuilder();

                var nextBar = offset == this._totalBars ? "<li class=\"am-disabled\"><a href=\"javascript:;\">»</a></li>" :
                    "<li><a href=\"" + this.Url + (offset + 1) + "\">»</a></li>";
                var preBar = offset == 1 ? "<li class=\"am-disabled\"><a href=\"javascript:;\">«</a></li>" :
                    "<li><a href=\"" + this.Url + (offset - 1) + "\">«</a></li>";
            //组装向上一个节点和下一页节点
            htmlHelper.Append(preBar);

            try
            {
                #region 分页核心代码
                if (this._totalBars > 7)
                {
                    if (offset < 5)
                    {

                        for (var i = 1; i <= 5; i++)
                        {
                            if (i == offset)
                            {
                                htmlHelper.Append("<li class=\"am-active\"><a href=\"" + this.Url + offset + "\">" + offset + "</a></li>");
                            }
                            else
                            {
                                htmlHelper.Append("<li><a href=\"" + this.Url + i + "\">" + i + "</a></li>");
                            }
                        }
                        htmlHelper.Append("<li><a>...</a></li>");
                        htmlHelper.Append("<li><a href=\"" + this.Url + (this._totalBars) + "\">" + (this._totalBars) + "</a></li>" + nextBar);
                    }
                    else if (offset >= 5 && offset <= this._totalBars - 4)
                    {

                        htmlHelper.Append("<li><a href=\"" + this.Url + 1 + "\">" + 1 + "</a></li>");
                        //第一个
                        htmlHelper.Append("<li><a>...</a></li>"); //省略号

                        htmlHelper.Append("<li><a href=\"" + this.Url + (offset - 1) + "\">" + (offset - 1) + "</a></li>");

                        htmlHelper.Append("<li class=\"am-active\"><a  href=\"" + this.Url + offset + "\">" + offset + "</a></li>");

                        htmlHelper.Append("<li><a href=\"" + this.Url + (offset + 1) + "\">" + (offset + 1) + "</a></li>");

                        htmlHelper.Append("<li><a>...</a></li>"); //省略号;

                        htmlHelper.Append("<li><a href=\"" + this.Url + (this._totalBars) + "\">" + (this._totalBars) + "</a></li>"); //尾页

                        htmlHelper.Append(nextBar);

                    }
                    else if (offset > this._totalBars - 4 && offset <= this._totalBars)
                    {

                        htmlHelper.Append("<li><a href=\"" + this.Url + 1 + "\">" + 1 + "</a></li>" + "<li><a>...</a></li>");

                        for (var j = 4; j >= 0; j--)
                        {
                            if (this._totalBars - j == offset)
                            {
                                htmlHelper.Append("<li class=\"am-active\"><a href=\"" + this.Url + (this._totalBars - j) + "\">" + (this._totalBars - j) + "</a></li>");
                            }
                            else
                            {
                                htmlHelper.Append("<li><a href=\"" + this.Url + (this._totalBars - j) + "\">" + (this._totalBars - j) + "</a></li>");
                            }
                        }
                        htmlHelper.Append(nextBar);
                    }
                    else
                    {
                        throw new Exception("分页数据出错!");
                    }
                }
                else
                {
                    for (var i = 1; i <= this._totalBars; i++)
                    {
                        if (i == offset)
                        {
                            htmlHelper.Append("<li class=\"am-active\"><a href=\"" + this.Url + offset + "\">" + offset + "</a></li>");
                        }
                        else
                        {
                            htmlHelper.Append("<li><a href=\"" + this.Url + i + "\">" + i + "</a></li>");
                        }
                    }
                    htmlHelper.Append(nextBar);
                }
                #endregion
            }
            catch (Exception ex)
            {
                return new MvcHtmlString("");
            }
            
            return new MvcHtmlString(htmlHelper.ToString());
        }
    }

以上就是分页的核心代码，看不懂没有关系，会调用就行。

为了使得后台调用简单，我们将其扩展在Razor的Html对象上，那样的话，@Html(参数列表)就可以使用了

public static MvcHtmlString PageBar(this HtmlHelper htmlhelper, string area, string controller, string action, int pagesize, int totalcount)
        {
            int offset = 0;
                
            string queryOffset=HttpContext.Current.Request.QueryString["offset"];

            int.TryParse(queryOffset, out offset);

            PageFactory helper = null;
            Dictionary<string, string> dic = new Dictionary<string, string>();
            dic.Add("Name", "Yangxu");
            dic.Add("Product", "Fruit");
            helper = new PageFactory(controller, action, totalcount, pagesize,area,dic);
            
            return helper.Core(offset);
        }

因为有些时候要GET传递参数，需要传入GET参数的键值对。

运行结果如下

可供参考的CSS样式我也为大家贴出来：

.result-page a {
    display:inline-block;
    float: left;
    margin-left: 10px;
    width: 30px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    font-family: '微软雅黑';
    border: #cccccc 1px solid;
    border-radius: 2px;
    color: #31a030;
    background: white;
    margin-top: 35px;
    text-decoration:none;
}

.result-page a:hover,.result-page a:active {
     background: #31a030;
     color: white;
}

.am-active a{
    background: #31a030 !important;
    color: white !important;
}

希望对大家有帮助。