ABP入门系列之分页功能的实现

public class GetTasksInput : PagedSortedAndFilteredInputDto
{
 public TaskState? State { get; set; }
 public int? AssignedPersonId { get; set; }
}

PagedResultDto<TaskDto> GetPagedTasks(GetTasksInput input);

public PagedResultDto<TaskDto> GetPagedTasks(GetTasksInput input)
{
 //初步过滤
 var query = _taskRepository.GetAll().Include(t => t.AssignedPerson)
  .WhereIf(input.State.HasValue, t => t.State == input.State.Value)
  .WhereIf(!input.Filter.IsNullOrEmpty(), t => t.Title.Contains(input.Filter))
  .WhereIf(input.AssignedPersonId.HasValue, t => t.AssignedPersonId == input.AssignedPersonId.Value);
 //排序
 query = !string.IsNullOrEmpty(input.Sorting) ? query.OrderBy(input.Sorting) : query.OrderByDescending(t => t.CreationTime);
 //获取总数
 var tasksCount = query.Count();
 //默认的分页方式
 //var taskList = query.Skip(input.SkipCount).Take(input.MaxResultCount).ToList();
 //ABP提供了扩展方法PageBy分页方式
 var taskList = query.PageBy(input).ToList();
 return new PagedResultDto<TaskDto>(tasksCount,taskList.MapTo<List<TaskDto>>());
}

 public ActionResult PagedList(int? page)
 {
  //每页行数
  var pageSize = 5;
  var pageNumber = page ?? 1;//第几页
  var filter = new GetTasksInput
  {
   SkipCount = (pageNumber - 1)  pageSize,//忽略个数
   MaxResultCount = pageSize
  };
  var result = _taskAppService.GetPagedTasks(filter);
  //已经在应用服务层手动完成了分页逻辑，所以需手动构造分页结果
  var onePageOfTasks = new StaticPagedList<TaskDto>(result.Items, pageNumber, pageSize, result.TotalCount);
  //将分页结果放入ViewBag供View使用
  ViewBag.OnePageOfTasks = onePageOfTasks;
  return View();
}

@using X.PagedList.Mvc;
@using Abp.Web.Mvc.Extensions
@using X.PagedList; 
<link href="~/Content/PagedList.css" rel="external nofollow" rel="stylesheet" />
<ul class="list-group">
 @foreach (var task in ViewBag.OnePageOfTasks)
 {
  <li class="list-group-item">
   <div class="btn-group pull-right">
    <button type="button" class="btn btn-info">Edit</button>
    <button type="button" class="btn btn-suess">Delete</button>
   </div>
   <div class="media">
    <a class="media-left" href="#" rel="external nofollow" >
     @<i class="fa @Model.GetTaskLable(task) fa-3x"></i>@
    </a>
    <div class="media-body">
     <h4 class="media-heading">@task.Title</h4>
     <span class="text-muted">@task.CreationTime.ToString("yyyy-MM-dd HH:mm:ss")</span>
    </div>
   </div>
  </li>
 }
</ul>
@Html.PagedListPager((IPagedList)ViewBag.OnePageOfTasks, page => Url.Action("PagedList", new { page }))