Asp.Net MVC 分页、检索、排序整体实现代码

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;
          }
        }

再进行绑定：

 _kernel.Bind<IUsersRepository>().To<UsersRepository>();