public class IndexModel : PageModel
{      public CultureInfo[] CulturesList { get; set; }private CultureInfo[] Cultures { get; set; }public IndexModel(){//this will act as the main data source for our projectCultures = CultureInfo.GetCultures(CultureTypes.AllCultures);}public void OnGet(){CulturesList = Cultures;}
}

打开Pages/Index.cshtml 并添加以下代码以显示区域性列表：

<table class="table table-striped"><thead><tr><th>LCID</th><th>English Name</th><th>Native Name</th><th>Culture types</th></tr></thead><tbody>@foreach (var c in Model.CulturesList){<tr><td>@c.LCID</td><td>@c.EnglishName</td><td>@c.NativeName</td><td>@c.CultureTypes</td></tr>}</tbody>
</table>

运行应用程序以查看第一个结果：

public class IndexModel : PageModel
{      public IList<CultureInfo> CulturesList { get; set; }private CultureInfo[] Cultures { get; set; }//page number variable[BindProperty(SupportsGet = true)]public int P { get; set; } = 1;//page size variable[BindProperty(SupportsGet = true)]public int S { get; set; } = 10;public IndexModel(){//this will act as the main data source for our projectCultures = CultureInfo.GetCultures(CultureTypes.AllCultures);}public void OnGet(){CulturesList = Cultures//make sure to order items before paging.OrderBy(x=>x.EnglishName)//skip items before current page.Skip((P-1)*S)//take only 10 (page size) items.Take(S)//call ToList() at the end to execute the query and return the result set.ToList();}
}

运行该应用程序，您将仅看到前10条记录。

//total number of records
public int TotalRecords { get; set; } = 0;public void OnGet()
{TotalRecords = Cultures.Count();CulturesList = Cultures//make sure to order items before paging.OrderBy(x=>x.EnglishName)//skip items before current page.Skip((P-1)*S)//take only 10 (page size) items.Take(S)//call ToList() at the end to execute the query and return the result set.ToList();
}

现在，我们准备使用分页标记帮助器。

Install-Package LazZiya.TagHelpers -Version 2.2.1

或使用nuget包管理器UI：

@addTagHelper *, LazZiya.TagHelpers

将页面标记帮助程序代码添加到表下方的Index.cshtml视图中：

<paging page-no="Model.P"page-size="Model.S"total-records="Model.TotalRecords">
</paging>

稍后，我们将在添加一些搜索过滤器之后添加query-string-value，现在，运行该应用并在其基本设置中测试分页控件：

//variable for text search
[BindProperty(SupportsGet = true)]
public string Q { get; set; } = string.Empty;public void OnGet()
{var query = Cultures//search in EnglishName and NativeName.Where(x =>x.EnglishName.Contains(Q, StringComparison.OrdinalIgnoreCase) ||x.NativeName.Contains(Q, StringComparison.OrdinalIgnoreCase));//count records that returns after the searchTotalRecords = query.Count();CulturesList = query//make sure to order items before paging.OrderBy(x => x.EnglishName)//skip items before current page.Skip((P - 1) * S)//take only 10 (page size) items.Take(S)//call ToList() at the end to execute the query and return the result set.ToList();
}

我们定义了一个名为"Q"的string变量，该变量将分配给搜索文本框。此外，我们修改了逻辑，以便TotalRecords值返回搜索后的记录数。

<form method="get" class="form-inline"><input asp-for="Q" class="form-control" /><button type="submit" class="btn btn-primary">Search</button>
</form>

确保form方法是"get"因为我们在后端定位目标OnGet()方法，这将使我们能够共享任何编号页面的URL。

<paging page-no="Model.P"page-size="Model.S"total-records="Model.TotalRecords"query-string-value="@(Request.QueryString.Value)">
</paging>

现在，搜索和分页可以很好地协同工作。

<paging page-no="Model.P"page-size="Model.S"total-records="Model.TotalRecords"query-string-value="@(Request.QueryString.Value)"show-prev-next="true"show-total-pages="true"show-total-records="true"show-page-size-nav="true"show-first-numbered-page="true"show-last-numbered-page="true">
</paging>

现在我们有了更多功能的分页控件：

//object that contains only displayed fields
public class CultureItem
{public int LCID { get; set; }public string EnglishName { get; set; }public string NativeName { get; set; }public CultureTypes CultureTypes { get; set; }
}//return list of CultureItem
public IList<CultureItem> CulturesList { get; set; }public void OnGet()
{var query = Cultures//search in EnglishName and NativeName.Where(x =>x.EnglishName.Contains(Q, StringComparison.OrdinalIgnoreCase) ||x.NativeName.Contains(Q, StringComparison.OrdinalIgnoreCase))//map the selected fields to our new object.Select(x => new CultureItem{LCID = x.LCID,EnglishName = x.EnglishName,NativeName = x.NativeName,CultureTypes = x.CultureTypes});//count records that returns after the searchTotalRecords = query.Count();CulturesList = query//make sure to order items before paging.OrderBy(x => x.EnglishName)//skip items before current page.Skip((P - 1) * S)//take only 10 (page size) items.Take(S)//call ToList() at the end to execute the query and return the result set</span>.ToList();
}

改善搜寻逻辑

var _keyWords = Q.Split(new[] { ' ', ',', ':' },
StringSplitOptions.RemoveEmptyEntries).Distinct();

当使用MSSqlDb之类的数据库并在可为空的字段中进行搜索时，如果搜索到的字段为null，则可能会出现异常，为了避免在null字段中进行搜索，我们可以在搜索逻辑中添加null检查条件。

var query = Cultures//search in EnglishName and NativeName.Where(x => _keyWords.Any(kw =>(x.EnglishName!=null && x.EnglishName.Contains(kw, StringComparison.OrdinalIgnoreCase)) ||(x.NativeName != null && x.NativeName.Contains(kw, StringComparison.OrdinalIgnoreCase))))

通过在搜索数据库时使用AsNoTracking()，甚至可以进一步提高性能，因此框架不会继续跟踪所选实体，这将有助于释放一些内存。