在同一个命名空间下:
1.定义接口
public interface IPagedList<T> : IList<T>
{
int PageIndex { get; }
int PageSize { get; }
int TotalCount { get; }
int TotalPages { get; }
bool HasPreviousPage { get; }
bool HasNextPage { get; }
}
注意:IList<T> 继承了ICollection<T>, IEnumerable<T>, Ienumerable
2.实现接口:
[Serializable]//讲当前类的实例序列化,便于网络中传输和保存
public class PagedList<T> : List<T>, IPagedList<T>
{
/// <summary>
/// Ctor
/// </summary>
/// <param name="source">source</param>
/// <param name="pageIndex">Page index</param>
/// <param name="pageSize">Page size</param>
public PagedList(IQueryable<T> source, int pageIndex, int pageSize)
{
int total = source.Count();
this.TotalCount = total;
this.TotalPages = total / pageSize;
if (total % pageSize > 0)
TotalPages++;
this.PageSize = pageSize;
this.PageIndex = pageIndex;
this.AddRange(source.Skip(pageIndex * pageSize).Take(pageSize).ToList());
}
/// <summary>
/// Ctor
/// </summary>
/// <param name="source">source</param>
/// <param name="pageIndex">Page index</param>
/// <param name="pageSize">Page size</param>
public PagedList(IList<T> source, int pageIndex, int pageSize)
{
TotalCount = source.Count();
TotalPages = TotalCount / pageSize;
if (TotalCount % pageSize > 0)
TotalPages++;
this.PageSize = pageSize;
this.PageIndex = pageIndex;
this.AddRange(source.Skip(pageIndex * pageSize).Take(pageSize).ToList());
}
/// <summary>
/// Ctor
/// </summary>
/// <param name="source">source</param>
/// <param name="pageIndex">Page index</param>
/// <param name="pageSize">Page size</param>
/// <param name="totalCount">Total count</param>
public PagedList(IEnumerable<T> source, int pageIndex, int pageSize, int totalCount)
{
TotalCount = totalCount;
TotalPages = TotalCount / pageSize;
if (TotalCount % pageSize > 0)
TotalPages++;
this.PageSize = pageSize;
this.PageIndex = pageIndex;
this.AddRange(source);
}
public int PageIndex { get; private set; }
public int PageSize { get; private set; }
public int TotalCount { get; private set; }
public int TotalPages { get; private set; }
public bool HasPreviousPage
{
get { return (PageIndex > 0); }
}
public bool HasNextPage
{
get { return (PageIndex + 1 < TotalPages); }
}
}
3.功能的实现(控制器中)
从数据源(数据库)查询数据 为Hus
var aHus = new PagedList<Entity>(Hus, command.Page - 1, command.PageSize);// Entity:需要分页的实体, Hus:查询后的总数据
var gridModel = new DataSourceResult
{
Data = aHus.Select(x =>
{
// var m = x.ToModel();
var m=new EntityModel(); // EntityModel界面model
赋值。。。。
return m;
}),
Total = aHus.TotalCount
};
return Json(gridModel);
可简写为:
var gridModel = new DataSourceResult
{
Data = new PagedList<Entity>(Hus, command.Page - 1, command.PageSize).Select(x =>
{
//var m = x.ToModel();
var m=new EntityModel(); // EntityModel界面model
赋值。。。。
return m;
}),
Total = aHus.TotalCount
};
return Json(gridModel);
注意:DataSourceResult类为 (功能为装数据)
public class DataSourceResult
{
public IEnumerable Data { get; set; }
public int Total { get; set; }
}
4.前端代码(省去)