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ASP.NET-FineUI开发实践-3

1.参照模拟数据库分页通过缓存重写内存分页,优化页面响应速度

Grid的响应速度是硬伤,我写了个通用方法把所有数据放在缓存中模拟数据库分页,比自带的缓存分页快很多,这里贴上实体类的通用方法,DataTable的就不贴了可以参照官方的自己写。记住要加上grid_PageIndexChange事件和grid_Sort事件,这里就不写了

  

        /// <summary>
        /// 获取数据源
        /// </summary>
        /// <returns></returns>
        private void GetData()
        {
            List<MsUser> lstUser = GetData();//数据库返回数据实体
            ViewState["lstUserData"] = JsonConvert.SerializeObject(lstUser);
        }

        /// <summary>
        /// 数据源绑定
        /// </summary>
        private void BindGridView()
        {
            string slstUserData = ViewState["lstUserData"].ToString();
            BindGridView<MsUser>(slstUserData, ref grid);
        }



         /// <summary>
        /// 绑定数据源
        /// </summary>
        /// <typeparam name="T">范数据</typeparam>
        /// <param name="vDataNew">数据Json</param>
        /// <param name="g">grid</param>
        public static void BindGridView<T>(string vDataNew, ref Grid g)
        {

            List<T> DataNew = (List<T>)JsonConvert.DeserializeObject(vDataNew, typeof(List<T>));
            g.RecordCount = DataNew.Count;
            int pageSize = g.PageSize;//获取页显示数
            int pageIndex = g.PageIndex;//获取当前页数
            int pi = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(DataNew.Count) / Convert.ToDouble(g.PageSize)));
            pageIndex = pageIndex + 1 > pi ? pi - 1 : pageIndex;//重新绑定时(如查询)要判断页数
            if (pageIndex < 0)
            {
                pageIndex = 0;
            }
            try
            {
                Reverser<T> reverser = null;
                string SortField = g.SortField;//获取排序字段
                if (SortField == "")
                {
                    SortField = g.Columns[1].SortField;//默认第二列为排序列
                }
                reverser = new Reverser<T>(DataNew[0].GetType(), SortField, g.SortDirection == "ASC" ? ReverserInfo.Direction.ASC : ReverserInfo.Direction.DESC);//排序方法
                DataNew.Sort(reverser);
                if (pageSize <= DataNew.Count)
                {
                    int pz = pageSize < DataNew.Count - pageIndex * pageSize ? pageSize : DataNew.Count - pageIndex * pageSize;
                    if (pageSize == DataNew.Count)
                    {
                        pz = pageSize;
                    }
                    DataNew = DataNew.GetRange((pageIndex) * pageSize, pz);//截取数据
                }

                g.DataSource = DataNew;//绑定
                g.DataBind();

            }
            catch (Exception ex)
            {
                //Response.Write(ex.Message);
                g.DataSource = null;
                g.DataBind();
            }
            g.PageIndex = g.PageIndex + 1 > g.PageCount ? g.PageCount - 1 : g.PageIndex;
            if (g.PageIndex < 0)
            {
                g.PageIndex = 0;
            }
        }



     /*从网上下的实体类排序类*/
    /// <summary>
    /// 继承IComparer<T>接口,实现同一自定义类型 对象比较
    /// </summary>
    /// <typeparam name="T">T为泛用类型</typeparam>
    public class Reverser<T> : IComparer<T>
    {
        private Type type = null;
        private ReverserInfo info;

        /**/
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="type">进行比较的类类型</param>
        /// <param name="name">进行比较对象的属性名称</param>
        /// <param name="direction">比较方向(升序/降序)</param>
        public Reverser(Type type, string name, ReverserInfo.Direction direction)
        {
            this.type = type;
            this.info.name = name;
            if (direction != ReverserInfo.Direction.ASC)
                this.info.direction = direction;
        }


        /**/
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="className">进行比较的类名称</param>
        /// <param name="name">进行比较对象的属性名称</param>
        /// <param name="direction">比较方向(升序/降序)</param>
        public Reverser(string className, string name, ReverserInfo.Direction direction)
        {
            try
            {
                this.type = Type.GetType(className, true);
                this.info.name = name;
                this.info.direction = direction;
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
        }

        /**/
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="t">进行比较的类型的实例</param>
        /// <param name="name">进行比较对象的属性名称</param>
        /// <param name="direction">比较方向(升序/降序)</param>
        public Reverser(T t, string name, ReverserInfo.Direction direction)
        {
            this.type = t.GetType();
            this.info.name = name;
            this.info.direction = direction;
        }

        //必须!实现IComparer<T>的比较方法。
        int IComparer<T>.Compare(T t1, T t2)
        {
            object x = this.type.InvokeMember(this.info.name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty, null, t1, null);
            object y = this.type.InvokeMember(this.info.name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty, null, t2, null);
            if (this.info.direction != ReverserInfo.Direction.ASC)
                Swap(ref x, ref y);
            return (new CaseInsensitiveComparer()).Compare(x, y);
        }

        //交换操作数
        private void Swap(ref object x, ref object y)
        {
            object temp = null;
            temp = x;
            x = y;
            y = temp;
        }
    }

    /**/
    /// <summary>
    /// 对象比较时使用的信息类
    /// </summary>
    public struct ReverserInfo
    {
        /**/
        /// <summary>
        /// 比较的方向,如下:
        /// ASC:升序
        /// DESC:降序
        /// </summary>
        public enum Direction
        {
            ASC = 0,
            DESC,
        };

        public enum Target
        {
            CUSTOMER = 0,
            FORM,
            FIELD,
            SERVER,
        };

        public string name;
        public Direction direction;
        public Target target;
    }

  

2.得到指定行指定列的值后台,rows的values是行的值,后台可以看到,通过列号找到数组的值,这个方法不是很保险但是聊胜于无

01.grid.Rows[rowindex].Values[grid.FindColumn(Columnid).ColumnIndex].ToString();  

  

3.按钮至少选择一项的通用方法,OnClientClick+=累加。

        /// <summary>
        /// 至少选择一项
        /// </summary>
        /// <param name="g"></param>
        /// <param name="ctrls"></param>
        private void NoSelectionNull(Grid g, params FineUI.Button[] ctrls)
        {
            foreach (FineUI.Button ctrl in ctrls)
            {
                ctrl.OnClientClick += g.GetNoSelectionAlertReference("至少选择一项!");
            }
        }
        
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
              NoSelectionNull(Grid1, Button4, Button2, Button3, Button6);
            }
        }

  

posted @ 2014-10-12 16:22 走路要用腿 阅读(...) 评论(...) 编辑 收藏
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