Question

我们正在跟踪分页指南-https://docs.microsoft.com/en-us/aspnet/core/data/ef-rp/sort-filter-page?view=aspnetcore-2.1。

我们将页面大小设置为3进行测试，并在查询中返回54条记录。由于某些原因，var count = await source.CountAsync（）;在此下面返回为3？！？！有什么想法吗？

author_url

PaginatedList.cs类：

106422854611155436041

这是该index.cshtml的后端代码：

public static async Task<PaginatedList<T>> CreateAsync(
            IQueryable<T> source, int pageIndex, int pageSize)
        {
            var count = await source.CountAsync();
            var items = await source.Skip(
                (pageIndex - 1) * pageSize)
                .Take(pageSize).ToListAsync();
            return new PaginatedList<T>(items, count, pageIndex, pageSize);
        }

Answer 1

实际上，我替换为：

>>> s =set()
>>> exact = 0
>>> exact_over = 0
>>> exact_under = 0

>>>for i in range(100):
...     differ = (i - (i**0.5)**2)
...     s |= {differ}
...     exact += 1 if differ == 0 else 0
...     exact_over  += 1 if differ > 0  else 0
...     exact_under += 1 if differ < 0  else 0

>>> sorted(list(s)) 
[-1.4210854715202004e-14,
 -7.105427357601002e-15,
 -3.552713678800501e-15,
 -1.7763568394002505e-15,
 -8.881784197001252e-16,
 -4.440892098500626e-16,
 0.0,
 4.440892098500626e-16,
 8.881784197001252e-16,
 1.7763568394002505e-15,
 3.552713678800501e-15,
 7.105427357601002e-15,
 1.4210854715202004e-14]

>>> exact_under, exact, exact_over
(26, 49, 25)

到

var count = await source.CountAsync();

这返回了正确的计数。

.Net Core 2中的Razor页面的分页问题-第2部分

1 个答案: