使用 Skip 和 Take 返回错误结果的 Linq 分页

Question

var queryResultPage = eventsResults.Results
                .Skip(pageParameters.PageSize * pageParameters.CurrentPageNumber)
                .Take(pageParameters.PageSize).ToList();

var queryResultPage = eventsResults.Results.Skip(10* 1).Take(10).ToList();

Now if the number of objects in Results is 16 this Linq query is returning only 6 result, where it should have returned 10 .

Answer 1

CurrentPageNumber应该从零开始，如果它的 1 只使用(CurrentPageNumber - 1)

Answer 2

You have stated that you want to skip the first 10 records and then take 10 of the rest. If it only contains 16 you get only the remaining 6 since 16-10=6 .

Maybe you should initialize pageParameters.CurrentPageNumber with 0 instead of 1. Then you're skipping 10 * 0 records for the first page.

Answer 3

如果第一页上pageParameters.CurrentPageNumber的值为 1，则它会跳过前 10 个结果并仅返回剩余的 6 个元素

Answer 4

In case you would like the last page to contain result set of maximum page length then you should first check if this is the last page and take the last <PageSize> number of results:

if (pageParameters.PageSize * pageParameters.CurrentPageNumber > eventsResults.Results.Count()
{
    var queryResultPage = eventsResults.Results.Reverse().Take(pageParameters.PageSize).Reverse();
}
else
{
    // do the paging same way you did before
}

Answer 5

CurrentPageNumber should be zero-based

You start with 16 elements. You skip 10 of them, leaving 6. You then take up to 10 of them... so you get 6. Basically everything is working in the way you should be expecting it to

Answer 6

This fixed My error -

  var queryResultPage = eventsResults.Results
                .Skip(pageParameters.PageSize * (pageParameters.CurrentPageNumber - 1))
                .Take(pageParameters.PageSize).ToList();