Csharp: ASP.NET Core 3.1 Razor Pages - Query and Pagination
2022/4/20 14:12:46
本文主要是介绍Csharp: ASP.NET Core 3.1 Razor Pages - Query and Pagination，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
libman.json:
{
"version": "1.0", //当前的libman文件版本
"defaultProvider": "cdnjs", //默认从哪个CDN网络下载文件
"libraries": [
{
"library": "twitter-bootstrap@4.3.1", //要下载的前端包名称
"destination": "wwwroot/lib/twitter-bootstrap/" //存放库的文件路径地址
},
{
"library": "jquery@3.4.1", //要下载的前端包名称
"destination": "wwwroot/lib/jquery/", //存放库的文件路径地址
"provider": "jsdelivr", //针对某个独立的文件，从其他源下载。
"files": [ "dist/jquery.js", "dist/jquery.min.js" ] //下载该库中特定的文件，而不是下载所有的文件
},
{
"library": "jquery-validate@1.19.1",
"destination": "wwwroot/lib/jquery-validate"
},
{
"library": "jquery-validation-unobtrusive@3.2.11",
"destination": "wwwroot/lib/jquery-validate-unobtrusive"
},
{
"provider": "jsdelivr",
"library": "font-awesome@4.7.0",
"destination": "wwwroot/lib/font-awesome"
}
]
}
Startup.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
namespace RazorPagesPagination
{
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddSession();
services.AddMvc();
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
//wwwroot 下的文件夹配置
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler("/Error");
// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseSession();
app.UseMvc();
}
}
}
_Layout.cshtml
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>ASP.NET Core Razor Pages - Pagination Example</title>
<meta name="description" content=" geovindu,Geovin Du,涂聚文" />
<meta name="keywords" content="geovindu,Geovin Du" />
<link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet" />
<link href="~/lib/twitter-bootstrap/css/bootstrap.css" rel="stylesheet" />
</head>
<body>
<div class="container text-center">
<div class="col">
<h1>ASP.NET Core Razor Pages - Pagination Example</h1>
@RenderBody()
</div>
</div>
<hr />
<div class="credits text-center">
<p>
<a href="http://jasonwatmore.com/post/2018/10/15/aspnet-core-razor-pages-pagination-example">ASP.NET Core Razor Pages - Pagination Example</a>
</p>
<p>
<a href="http://jasonwatmore.com">JasonWatmore.com</a>
</p>
</div>
<script src="~/lib/jquery/dist/jquery.min.js"></script>
<script src="~/lib/twitter-bootstrap/js/bootstrap.min.js"></script>
@RenderSection("Scripts", required: false)
</body>
</html>
Index.cshtml
@page
@model RazorPagesPagination.Pages.IndexModel
<!-- pager parameter controls -->
<form method="post" class="container border text-left pt-2 mb-3">
<div class="form-row form-group">
<div class="col">
<label asp-for="TotalItems">Total number of items</label>
<select asp-for="TotalItems" asp-items="Model.TotalItemsList" class="form-control form-control-sm" onchange="this.form.submit()"></select>
</div>
<div class="col">
<label asp-for="PageSize">Items per page</label>
<select asp-for="PageSize" asp-items="Model.PageSizeList" class="form-control form-control-sm" onchange="this.form.submit()"></select>
</div>
<div class="col">
<label asp-for="MaxPages">Max page links displayed</label>
<select asp-for="MaxPages" asp-items="Model.MaxPagesList" class="form-control form-control-sm" onchange="this.form.submit()"></select>
</div>
标题: <input type="text" asp-for="SearchKey" value="@Model.SearchKey" onchange="this.form.submit()" />
<input type="submit" value="查询" onchange="this.form.submit()" />
</div>
</form>
<!-- items being paged -->
<table class="table table-sm table-striped table-bordered">
@if (!Object.Equals(Model.DuItmes, null))
{
@foreach (var item in Model.DuItmes)
{
<tr>
<td>@item.Id</td>
<td>@item.RealName</td>
<td>@item.UserName</td>
</tr>
}
}
else
{
<tr>
<td>No data!</td>
</tr>
}
</table>
<!-- pager -->
@if (!Object.Equals(Model.DuItmes, null))
{
@if (Model.Pager.Pages.Any())
{
<nav class="table-responsive">
<ul class="pagination justify-content-center d-flex flex-wrap">
@if (Model.Pager.CurrentPage > 1)
{
<li class="page-item">
<a class="page-link" href="/">First</a>
</li>
<li class="page-item">
<a class="page-link" href="/?p=@(Model.Pager.CurrentPage - 1)">Previous</a>
</li>
}
@foreach (var p in Model.Pager.Pages)
{
<li class="page-item @(p == Model.Pager.CurrentPage ? "active" : "")">
<a class="page-link" href="/?p=@p">@p</a>
</li>
}
@if (Model.Pager.CurrentPage < Model.Pager.TotalPages)
{
<li class="page-item">
<a class="page-link" href="/?p=@(Model.Pager.CurrentPage + 1)">Next</a>
</li>
<li class="page-item">
<a class="page-link" href="/?p=@(Model.Pager.TotalPages)">Last</a>
</li>
}
</ul>
</nav>
}
}
Index.cshtml.cs
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using JW; //JW.Pager
//https://github.com/cornflourblue/JW.Pager
//
namespace RazorPagesPagination.Pages
{
/// <summary>
/// geovindu,Geovin Du,涂聚文
/// </summary>
public class IndexModel : PageModel
{
public IEnumerable<string> Items { get; set; }
public List<Person> DuItmes { get; set; }
public List<Person> dummyItems { get; set; }
public Pager Pager { get; set; }
public SelectList TotalItemsList { get; set; }
public int TotalItems { get; set; }
public SelectList PageSizeList { get; set; }
public int PageSize { get; set; }
public SelectList MaxPagesList { get; set; }
public int MaxPages { get; set; }
[BindProperty(SupportsGet = true)]
public string SearchKey { get; set; }
public void OnGet(int p = 1)
{
// properties for pager parameter controls
TotalItemsList = new SelectList(new []{ 10, 150, 500, 1000, 5000, 10000, 50000, 100000, 1000000 });
TotalItems = HttpContext.Session.GetInt32("TotalItems") ?? 150;
PageSizeList = new SelectList(new []{ 1, 5, 10, 20, 50, 100, 200, 500, 1000 });
PageSize = HttpContext.Session.GetInt32("PageSize") ?? 10;
MaxPagesList = new SelectList(new []{ 1, 5, 10, 20, 50, 100, 200, 500 });
MaxPages = HttpContext.Session.GetInt32("MaxPages") ?? 10;
SearchKey = HttpContext.Session.GetString("SearchKey" ?? "");
// generate list of sample items to be paged
//查询一遍是空值
var dummyItems = Person.GetAllPerson().AsQueryable();// var dummyItems =Enumerable.Range(1, TotalItems).Select(x => "Item " + x);
if(object.Equals(dummyItems,null))
{
var dummyItemdd = Person.GetAllPerson();
dummyItems = dummyItemdd.AsQueryable();
}
if (!string.IsNullOrEmpty(SearchKey))
{
dummyItems = dummyItems.Where(b => b.RealName.Contains(SearchKey)|| b.UserName.Contains(SearchKey));
if (dummyItems.Count() > 0)
{
Pager = new Pager(dummyItems.Count(), p, PageSize, MaxPages);
// assign the current page of items to the Items property DuItmes
//Items = dummyItems.Skip((Pager.CurrentPage - 1) * Pager.PageSize).Take(Pager.PageSize);
DuItmes = dummyItems.Skip((Pager.CurrentPage - 1) * Pager.PageSize).Take(Pager.PageSize).ToList();
}
}
else
{
// get pagination info for the current page
Pager = new Pager(dummyItems.Count(), p, PageSize, MaxPages);
// assign the current page of items to the Items property
//Items = dummyItems.Skip((Pager.CurrentPage - 1) * Pager.PageSize).Take(Pager.PageSize);
DuItmes = dummyItems.Skip((Pager.CurrentPage - 1) * Pager.PageSize).Take(Pager.PageSize).ToList();
}
}
public IActionResult OnPost(int totalItems, int pageSize, int maxPages)
{
// update pager parameters for session and redirect back to 'OnGet'
HttpContext.Session.SetInt32("TotalItems", totalItems);
HttpContext.Session.SetInt32("PageSize", pageSize);
HttpContext.Session.SetInt32("MaxPages", maxPages);
HttpContext.Session.SetString("SearchKey", SearchKey);
return Redirect("/");
}
}
public class Person
{
/// <summary>
///
/// </summary>
public int Id { get; set; }
/// <summary>
///
/// </summary>
public string RealName { get; set; }
/// <summary>
///
/// </summary>
public string UserName { get; set; }
public static List<Person> GetAllPerson()
{
List<Person> listPerson = new List<Person>
{
new Person{Id=1,RealName="涂聚文",UserName="geovindu1" },
new Person{Id=2,RealName="涂聚文",UserName="geovindu2" },
new Person{Id=3,RealName="涂聚文",UserName="geovindu3" },
new Person{Id=4,RealName="涂聚文",UserName="geovindu4" },
new Person{Id=5,RealName="涂聚文",UserName="geovindu5" },
new Person{Id=6,RealName="涂聚文",UserName="geovindu6" },
new Person{Id=7,RealName="涂聚文",UserName="geovindu7" },
new Person{Id=8,RealName="涂聚文",UserName="geovindu8" },
new Person{Id=9,RealName="涂聚文",UserName="geovindu9" },
new Person{Id=10,RealName="涂聚文",UserName="geovindu10" },
new Person{Id=11,RealName="涂聚文",UserName="geovindu11" },
new Person{Id=12,RealName="涂聚文",UserName="geovindu12" },
new Person{Id=13,RealName="涂聚文",UserName="geovindu13" },
new Person{Id=14,RealName="涂聚文",UserName="geovindu14" },
new Person{Id=15,RealName="涂聚文",UserName="geovindu15" },
new Person{Id=16,RealName="涂聚文",UserName="geovindu16" },
new Person{Id=17,RealName="涂聚文",UserName="geovindu17" },
new Person{Id=18,RealName="涂聚文",UserName="geovindu18" },
new Person{Id=19,RealName="涂聚文",UserName="geovindu19" },
new Person{Id=20,RealName="涂聚文",UserName="geovindu20" },
new Person{Id=21,RealName="涂聚文",UserName="geovindu21" },
new Person{Id=22,RealName="涂聚文",UserName="geovindu22" },
new Person{Id=23,RealName="涂聚文",UserName="geovindu23" },
new Person{Id=24,RealName="涂聚文",UserName="geovindu24" },
new Person{Id=25,RealName="涂聚文",UserName="geovindu25" },
new Person{Id=26,RealName="涂聚文",UserName="geovindu26" },
new Person{Id=27,RealName="涂聚文",UserName="geovindu27" },
new Person{Id=28,RealName="涂聚文",UserName="geovindu28" },
new Person{Id=29,RealName="涂聚文",UserName="geovindu29" },
new Person{Id=30,RealName="涂聚文",UserName="geovindu30" },
};
return listPerson;
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
namespace JW
{
//JW.Pager
//https://github.com/cornflourblue/JW.Pager/blob/master/Pager.cs
public class Pager
{
public Pager(
int totalItems,
int currentPage = 1,
int pageSize = 10,
int maxPages = 10)
{
// calculate total pages
var totalPages = (int)Math.Ceiling((decimal)totalItems / (decimal)pageSize);
// ensure current page isn't out of range
if (currentPage < 1)
{
currentPage = 1;
}
else if (currentPage > totalPages)
{
currentPage = totalPages;
}
int startPage, endPage;
if (totalPages <= maxPages)
{
// total pages less than max so show all pages
startPage = 1;
endPage = totalPages;
}
else
{
// total pages more than max so calculate start and end pages
var maxPagesBeforeCurrentPage = (int)Math.Floor((decimal)maxPages / (decimal)2);
var maxPagesAfterCurrentPage = (int)Math.Ceiling((decimal)maxPages / (decimal)2) - 1;
if (currentPage <= maxPagesBeforeCurrentPage)
{
// current page near the start
startPage = 1;
endPage = maxPages;
}
else if (currentPage + maxPagesAfterCurrentPage >= totalPages)
{
// current page near the end
startPage = totalPages - maxPages + 1;
endPage = totalPages;
}
else
{
// current page somewhere in the middle
startPage = currentPage - maxPagesBeforeCurrentPage;
endPage = currentPage + maxPagesAfterCurrentPage;
}
}
// calculate start and end item indexes
var startIndex = (currentPage - 1) * pageSize;
var endIndex = Math.Min(startIndex + pageSize - 1, totalItems - 1);
// create an array of pages that can be looped over
var pages = Enumerable.Range(startPage, (endPage + 1) - startPage);
// update object instance with all pager properties required by the view
TotalItems = totalItems;
CurrentPage = currentPage;
PageSize = pageSize;
TotalPages = totalPages;
StartPage = startPage;
EndPage = endPage;
StartIndex = startIndex;
EndIndex = endIndex;
Pages = pages;
}
public int TotalItems { get; private set; }
public int CurrentPage { get; private set; }
public int PageSize { get; private set; }
public int TotalPages { get; private set; }
public int StartPage { get; private set; }
public int EndPage { get; private set; }
public int StartIndex { get; private set; }
public int EndIndex { get; private set; }
public IEnumerable<int> Pages { get; private set; }
}
}
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