c# - 如何使搜索/分页在我的应用程序中可重用？

Question

我们决定在我们的应用程序中使用服务器端分页。实现非常简单:

• 假设我们在服务器端有这样的搜索操作:

  [HttpGet]
  public ActionResult GetPeopleByName(String term, Int32 itemsPerPage = 10, Int32 page = 0) {
      var matches = this.people.Where(i => i.Name.Contains(term));
      return Json(
          data: new {
              people = matches.Skip(itemsPerPage * page).Take(itemsPerPage).OrderBy(i => i.Name),
              total = matches.Count()
          },
          behavior: JsonRequestBehavior.AllowGet
      );
  }
  

• 在客户端我们有一个subscriptionHolderController:

  app.controller('subscriptionHolderController', ['$scope', '$http', function($scope, $http) {
      $scope.matches = [];
      $scope.itemsPerPage = 5;
      $scope.currentPage = 0;
      $scope.searchTerm = '';
  
      // $scope.prevPage = function() { ... };
      // $scope.prevPageDisabled = function() { ... };
      // $scope.nextPage = function() { ... };
      // $scope.nextPageDisabled = function() { ... };
  
      $scope.pageCount = function() { 
          return Math.ceil($scope.totalPages / $scope.itemsPerPage); 
      };
  
      $scope.$watch('currentPage', function() { $scope.search(); });
  
      $scope.search = function() {
          if($scope.searchTerm === '') return;
          // initiate a GET-request with params: { page: $scope.currentPage, term: $scope.searchTerm, itemsPerPage: $scope.itemsPerPage }
      }
      $scope.matchesFound = function () { return $scope.matches.length > 0; }
  }]);
  

问题

结果我们有一个简单的搜索框。但是我们的应用程序需要另一种类型的搜索以及一些附加功能，它不使用搜索词，并且其结果集应该按照与上面显示的相同的方式进行分页。

如何为不同类型的搜索重用分页逻辑？

Answer 1

在服务器端，您可以返回一个通用类，该类将保存您的数据(行总数)。

public class PagedResult<T>
    {
        public PagedResult(IEnumerable<T> data, long total)
        {
            Data = data;
            Total = total;
        }
        public PagedResult()
        {
        }
        public IEnumerable<T> Data { get; set; }
        public long Total { get; set; }

    }

您还可以抽象任何函数的输入参数，例如:

public class PageInfo
    {

        public int Page { get; set; }           
        public int PageSize { get; set; }
        public int Skip
        {
            get
            {
                return PageSize*(Page - 1);
            }
        }

        public PageInfo(int page, int pageSize)
        {
            Page = page;
            PageSize = pageSize;
        }

    }

一个实际的例子可能是这样的:

[HttpGet]
public ActionResult GetPeopleByName(String term, PageInfo pageinfo) {
    var matches = this.people.Where(i => i.Name.Contains(term));

    var pagedResult =  new PagedResult<AnySearchType>{
            data = matches.Skip(pageinfo.skip).Take(pageinfo.size).OrderBy(i => i.Name),
            total = matches.Count()
        };

    return Json(
        data: pagedResult,
        behavior: JsonRequestBehavior.AllowGet
    );
}

在客户端，您可以使用指令通过传递以下参数来抽象分页逻辑:

查看

<div class="box-content" scroll-pager="pagerConfig">
your data
<div>

Controller :

您可以传递一些配置，例如:

$scope.pagerConfig = {
        pageSize: 10,
        data: 'model.Data', // some text reference to your model
        total: 'model.Total', // some text reference to your model
        currentPage: 1,
        searchParamName: 'Text',// some text reference to your model
        resource: projectResource,// pass a resource object
        success: function (data, page, total) {

            }
    };