我想用PagingList<T>.CreateAsync()
在索引视图中创建 PagedList 但出现以下错误var modelPaging = await PagingList<UserListViewModel>.CreateAsync(model, 10, page);
:
无法从 system.collection.Generic.List 转换为 system.linq.IorderedQueryable
我的操作代码:
[HttpGet]
public async Task<IActionResult> Index(int page = 1)
{
List<UserListViewModel> model = new List<UserListViewModel>();
model = _userManager.Users.AsNoTracking().Select(u => new UserListViewModel
{
Id = u.Id,
FullName = u.FirstName + " " + u.LastName,
Email = u.Email
}).OrderBy(u => u.Id).ToList();
var modelPaging = await PagingList<UserListViewModel>.CreateAsync(model, 10, page);
return View(modelPaging);
}
和 UserListViewModel 视图模型:
public class UserListViewModel
{
public string Id { get; set; }
public string FullName { get; set; }
public string Email { get; set; }
public string RoleName { get; set; }
}
我应该对我的代码进行哪些更改?
我在这里问了关于这个主题的另一个问题link https://stackoverflow.com/questions/48350710/asp-core-how-to-use-paginglistt-createasync-with-a-viewmodel/48354828#48354828
该错误非常清楚地告诉你CreateAsync
needs IOrderedQueryable
但您给出的是已经从数据库检索到的数据。您应该传递查询本身。消除ToList
;
var query = _userManager.Users.AsNoTracking().Select(u => new UserListViewModel
{
Id = u.Id,
FullName = u.FirstName + " " + u.LastName,
Email = u.Email
}).OrderBy(u => u.Id);
var modelPaging = await PagingList<UserListViewModel>.CreateAsync(query, 10, page);
主要目的PagingList
直接从数据库而不是内存中应用分页。
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