很多时候需要这样的功能，对表格进行分页、排序和检索。这个有很多实现的方式，有现成的表格控件、用前端的mvvm，用户控件。但很多时候看着很漂亮的东西你想进一步控制的时候却不那么如意。这里自己实现一次，功能不是高大全，但求一个清楚明白，也欢迎园友拍砖。前端是bootstrap3+jPaginate，后台基于membership。没什么难点。
先上效果图。
分页其实就是处理好 每页项目数、总项目数、总页数、当前页。为了方便复用，就先从仓库开始说起。
一、建立仓库
1.定义Ipager接口，需要分页的模型仓库继承这个接口
namespace Protal.Model.Abstract { /// <summary> /// 分页处理 /// </summary> public interface IPager { /// <summary> /// 每页项目数 /// </summary> /// <value>The page item count.</value> int PageItemCount { get; set; } /// <summary> /// 总页数 /// </summary> /// <value>The totoal page.</value> int TotoalPage { get; } /// <summary> /// 显示的页数 /// </summary> /// <value>The display page.</value> int DisplayPage { get; set; } /// <summary> /// 满足条件的总数目 /// </summary> int TotalItem { get; set; } } }
2.定义IUsersRepository，主要处理User 相关的业务逻辑。Find函数是主要的查询方法，order表示顺反排序。
public interface IUsersRepository : IPager { /// <summary> /// Post list /// </summary> /// <param name="order">Order expression</param> /// <param name="filter">Filter expression</param> /// <param name="skip">Records to skip</param> /// <param name="take">Records to take</param> /// <returns>List of users</returns> IEnumerable<User> Find(int order=0,string filter="", int skip = 0, int take = 10); /// <summary> /// Get single post /// </summary> /// <param name="name">User id</param> /// <returns>User object</returns> User FindByName(string name); /// <summary> /// Add new user /// </summary> /// <param name="user">Blog user</param> /// <returns>Saved user</returns> User Add(User user); /// <summary> /// Update user /// </summary> /// <param name="user">User to update</param> /// <returns>True on success</returns> bool Update(User user); /// <summary> /// Save user profile /// </summary> /// <param name="user">Blog user</param> /// <returns>True on success</returns> bool SaveProfile(User user); /// <summary> /// Delete user /// </summary> /// <param name="userName">User ID</param> /// <returns>True on success</returns> bool Remove(string userName); }
二、仓库的实现和绑定
主要方法：Membership的中的User和我们自定义的不一样，所以存在一个转换
public class UsersRepository : IUsersRepository { /// <summary> /// The _user list /// </summary> private List<User> _userList = new List<User>(); /// <summary> /// The _page item count /// </summary> private int _pageItemCount; /// <summary> /// The _display page /// </summary> private int _displayPage; /// <summary> /// The _usercount /// </summary> private int _usercount; /// <summary> /// The _total item /// </summary> private int _totalItem; /// <summary> /// 标记是否有查询条件 没有的话则返回全部数目 /// </summary> private Func<User, bool> _func; /// <summary> /// Gets or sets the users. /// </summary> /// <value>The users.</value> public List<User> Users { get { int count; var usercollection = Membership.GetAllUsers(0, 999, out count); if (count == _usercount) return _userList; _usercount = count; var members = usercollection.Cast<MembershipUser>().ToList(); foreach (var membershipUser in members)//这里存在一个转换 { _userList.Add(new User { Email = membershipUser.Email, UserName = membershipUser.UserName, //roles password }); } return _userList; } set { _userList = value; } }
//查询
public IEnumerable<User> Find(int order = 0, string filter = "", int skip = 0, int take = 10) { if (take == 0) take = Users.Count;
//过滤 _func = string.IsNullOrEmpty(filter) ? (Func<User, bool>) (n => n.UserName != "") : (n => n.UserName.Contains(filter)); var users = Users.Where(_func).ToList(); //更新总数目 _totalItem = users.Count; users = order == 0 ? users.OrderBy(n => n.UserName).ToList() : users.OrderByDescending(n => n.UserName).ToList(); return users.Skip(skip).Take(take); } /// <summary> /// 每页项目数 /// </summary> /// <value>The page item count.</value> public int PageItemCount { get { if (_pageItemCount == 0) { _pageItemCount = ProtalConfig.UserPageItemCount; } return _pageItemCount; } set { _pageItemCount = value; } } /// <summary> /// 总页数 /// </summary> /// <value>The totoal page.</value> public int TotoalPage { get { var page = (int) Math.Ceiling((double) TotalItem/PageItemCount); return page==0?1:page; } } /// <summary> /// 显示的页数 /// </summary> /// <value>The display page.</value> public int DisplayPage { get { if (_displayPage == 0) { _displayPage = ProtalConfig.UserDisplayPage; } return _displayPage; } set { _displayPage = value; } } /// <summary> /// 满足条件的总数目 保持更新 /// </summary> /// <value>The total item.</value> public int TotalItem { get { if (_func == null) _totalItem = Users.Count; return _totalItem; } set { _totalItem = value; } } }
ProtalConfig.UserDisplayPage 这里是通过配置实现一个默认页数，让用户可以再webconfig中更改行列的数目。
public static int UserPageItemCount { get { if (_userPageItemCount == 0) { _userPageItemCount = WebConfigurationManager.AppSettings["UserPageItemCount"] != null ? Convert.ToInt16(WebConfigurationManager.AppSettings["UserPageItemCount"]) : 5; } return _userPageItemCount; } set { _userPageItemCount = value; } }