篇(17)-Asp.Net Core入门实战-文章管理之文章类别管理(Linq子查询) - ToB企服应用市场:ToB评测及商务社交产业平台

CREATE TABLE [dbo].[ArticleCategory](
[Id] [int] IDENTITY(1,1) NOT NULL,
[Title] [varchar](128) NOT NULL,
[ParentId] [int] NOT NULL,
[ClassList] [varchar](128) NULL,
[ClassLayer] [int] NULL,
[Sort] [int] NOT NULL,
[ImageUrl] [varchar](128) NULL,
[SeoTitle] [varchar](128) NULL,
[SeoKeywords] [varchar](256) NULL,
[SeoDescription] [varchar](512) NULL,
[IsDeleted] [bit] NOT NULL,
CONSTRAINT [PK_ARTICLECATEGORY] PRIMARY KEY NONCLUSTERED
(
[Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO

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@{ ViewData["Title"] = "新建文章分类"; }
@model ArticleCategory
<form action="/ArticleCategory/Create" method="post">
@Html.AntiForgeryToken()
<label asp-for="ParentId">父类别</label>
<label name="Parent_DisplayName" id="Parent_DisplayName">@ViewData["DisplayName"]</label>
<input type="hidden" asp-for="ParentId" id="ParentId" name="ParentId" value="@ViewData["ParentId"]" />
<label asp-for="Title">类别名称</label>
<input type="text" asp-for="Title" name="Title" placeholder="请输入类别名">
<label asp-for="Sort">排序</label>
<input type="text" asp-for="Sort" name="Sort" placeholder="排序">
<button type="submit">确定</button>
<button type="reset">重置</button>
</form>

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@{ ViewData["Title"] = "编辑菜单"; }
@model ArticleCategory
<form action="/ArticleCategory/Edit" method="post">
@Html.AntiForgeryToken()
<label asp-for="ParentId">父菜单</label>
<input type="text" asp-for="ParentId" name="ParentId" />
<input type="hidden" asp-for="Id" />
<label asp-for="Title">类别名成</label>
<input type="text" asp-for="Title" name="Title" placeholder="类别名成">
<label asp-for="Sort">排序</label>
<input type="text" asp-for="Sort" name="Sort" placeholder="排序">
<button type="submit">确定</button>
<button type="reset">重置</button>
</form>

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@using Humanizer;
@using RjWebCms.Db;
@using RjWebCms.Models.Articles;
@using RjWebCms.Common;
@model PaginatedList<ArticleCategoryView>
@{
ViewData["Title"] = "文章类别列表";
}
@section Scripts{
}
@ViewData["Title"]
@Html.AntiForgeryToken()
<form asp-action="Index" method="get">
<table>
<tr><td><a asp-controller="ArticleCategory" asp-action="Create">添加</a></td></tr>
<tr>
<td>查询关键词:<input type="text" name="SearchString" value="@ViewData["CurrentFilter"]" /></td>
<td><input type="submit" value="查询" /></td>
<td><a asp-action="Index">Back</a></td>
<td><a asp-action="DeleteAll">批量删除</a></td>
</tr>
</table>
</form>
<table class="table table-hover">
<thead>
<tr>
<td>✔</td>
<td><a asp-action="Index" asp-route-sortOrder="@ViewData["NameSortParm"]" asp-route-currentFilter="@ViewData["CurrentFilter"]">类别名称</a></td>
<td>父类名称</td>
<td><a asp-action="Index" asp-route-sortOrder="@ViewData["DateSortParm"]" asp-route-currentFilter="@ViewData["CurrentFilter"]">序号</a></td>
<td>操作</td>
</tr>
@foreach (var item in Model)
{
if (item.ParentId == 0)
{
<tr>
<td><input type="checkbox" class="done-checkbox" name="chk_ids" value="@item.Id"></td>
<td>@item.Title</td>
<td>\</td>
<td>@item.Sort</td>
<td>
<a asp-action="Create" asp-route-id="@item.Id">Add</a>
<a asp-action="Edit" asp-route-id="@item.Id">Edit</a>
<a asp-action="Delete" asp-route-id="@item.Id">Delete</a>
</td>
</tr>
}
else
{
<tr>
<td><input type="checkbox" class="done-checkbox" name="chk_ids" value="@item.Id"></td>
<td>@item.Title</td>
@*<td>@Html.Action("GetParentName",new { id=item.ParentId})</td>*@
<td>@item.ParentName</td>
<td>@item.Sort</td>
<td>
<a asp-action="Create" asp-route-id="@item.Id">Add</a>
<a asp-action="Edit" asp-route-id="@item.Id">Edit</a>
<a asp-action="Delete" asp-route-id="@item.Id">Delete</a>
</td>
</tr>
}
}
</thead>
</table>
@{
var prevDisabled = !Model.HasPreviousPage ? "disabled" : "";
var nextDisabled = !Model.HasNextPage ? "disabled" : ""; ;
}
<a asp-action="Index"
asp-route-sortOrder="@ViewData["CurrentSort"]"
asp-route-pageNumber="@(Model.PageIndex - 1)"
asp-route-currentFilter="@ViewData["CurrentFilter"]"
class="btn btn-default @prevDisabled">
上一页
</a>
<a asp-action="Index"
asp-route-sortOrder="@ViewData["CurrentSort"]"
asp-route-pageNumber="@(Model.PageIndex + 1)"
asp-route-currentFilter="@ViewData["CurrentFilter"]"
class="btn btn-default @nextDisabled">
下一页
</a>

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/// <summary>
/// 文章类别
/// </summary>
public class ArticleCategory
{
/// <summary>
/// 主键
/// </summary>
[Key]
public Int32 Id { get; set; }
/// <summary>
/// 分类标题
/// </summary>
[Required]
public String Title { get; set; }
/// <summary>
/// 父分类ID
/// </summary>
[Required]
public Int32 ParentId { get; set; }
/// <summary>
/// 类别ID列表(逗号分隔开)
/// </summary>
public String ClassList { get; set; }
/// <summary>
/// 类别深度
/// </summary>
public Int32? ClassLayer { get; set; }
/// <summary>
/// 排序
/// </summary>
[Required]
public Int32 Sort { get; set; }
/// <summary>
/// 分类图标
/// </summary>
public String ImageUrl { get; set; }
/// <summary>
/// 分类SEO标题
/// </summary>
public String SeoTitle { get; set; }
/// <summary>
/// 分类SEO关键字
/// </summary>
public String SeoKeywords { get; set; }
/// <summary>
/// 分类SEO描述
/// </summary>
public String SeoDescription { get; set; }
/// <summary>
/// 是否删除
/// </summary>
[Required]
public Boolean IsDeleted { get; set; }
}
（3.2）. ArticleCategoryView.cs 也就是文章类别列表页的ViewModel代码
public class ArticleCategoryView
{
public int Id { get; set; }
public string Title { get; set; }
public int ParentId { get; set; }
public string ParentName { get; set; }
public int Sort { get; set; }
}
（4）.Controller的编码实现
public class ArticleCategoryController : Controller
{
private readonly IArticleCategoryService _articleCategoryService;
private readonly AppDbContext _appDbContext;
public ArticleCategoryController(IArticleCategoryService articleCategoryService, AppDbContext appDbContext)
{
_appDbContext = appDbContext;
_articleCategoryService = articleCategoryService;
}
public async Task<IActionResult> Index(string sortOrder, string currentFilter, string searchString, int? pageNumber)
{
ViewData["CurrentSort"] = sortOrder;
ViewData["NameSortParm"] = String.IsNullOrEmpty(sortOrder) ? "name_desc" : "";
ViewData["DateSortParm"] = sortOrder == "sort" ? "sort_desc" : "sort";
if (searchString != null)
{
pageNumber = 1;
}
else
{
searchString = currentFilter;
}
ViewData["CurrentFilter"] = searchString;
var articleCategories = from s in _appDbContext.ArticleCategory.OrderBy(s=>s.Id)
join p in _appDbContext.ArticleCategory on s.ParentId equals p.Id into T1
from m in T1.DefaultIfEmpty()
select new ArticleCategoryView
{
Id = s.Id,
Title = s.Title,
ParentId = s.ParentId,
ParentName = m.Title,
Sort = s.Sort
};
if (!string.IsNullOrEmpty(searchString))
{
articleCategories = articleCategories.Where(s => s.Title.Contains(searchString));
}
switch (sortOrder)
{
case "name_desc":
articleCategories = articleCategories.OrderByDescending(s => s.Title);
break;
case "sort":
articleCategories = articleCategories.OrderBy(s => s.Sort);
break;
case "sort_desc":
articleCategories = articleCategories.OrderByDescending(s => s.Sort);
break;
default:
articleCategories = articleCategories.OrderBy(s => s.Title);
break;
}
int pageSize = 4;
return View(await PaginatedList<ArticleCategoryView>.CreateAsync(articleCategories.AsNoTracking(), pageNumber ?? 1, pageSize));
}
[HttpGet]
public async Task<IActionResult> Create(int id)
{
if (id != 0)
{
var articleCategory = await _articleCategoryService.FindArticleCategoryAsync(id);
if (articleCategory != null)
{
ViewData["DisplayName"] = articleCategory.Title;
ViewData["ParentId"] = articleCategory.Id; //增加子目录时，以id作为子目录的parentid
}
}
else
{
ViewData["DisplayName"] = "顶级根目录";
ViewData["ParentId"] = 0;
}
return View();
}
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create(int id, ArticleCategory articleCategory)
{
//去掉对字段IsSystem的验证,IsSystem在数据库是bool类型,而前端是0和1，ModelState的验证总是报false，所以去掉对其验证
//ModelState.Remove("IsSystem");//在View端已经解决了了bool类型，那么此行代码可以不用
if (id != 0)
articleCategory.ParentId = id;
if (ModelState.IsValid)
{
var successful = await _articleCategoryService.AddArticleCategoryAysnc(articleCategory);
if (successful)
return RedirectToAction("Index");
else
return BadRequest("失败");
}
return View(articleCategory);
}<br>
[HttpGet]
public async Task<IActionResult> Edit(int id)
{
if (string.IsNullOrEmpty(id.ToString()))
return NotFound();
var articleCategory = await _articleCategoryService.FindArticleCategoryAsync(id);
if (articleCategory == null)
return NotFound();
return View(articleCategory);
}
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Edit(int id, ArticleCategory articleCategory)
{
if (id != articleCategory.Id)
{
return NotFound();
}
if (ModelState.IsValid)
{
try
{
var result = await _articleCategoryService.UpdateArticleCategoryAsync(id, articleCategory);
}
catch (Exception ex)
{
return BadRequest("编辑失败");
}
return RedirectToAction("Index");
}
return View(articleCategory);
}
[HttpGet]
public async Task<IActionResult> Delete(int id)
{
var result = await _articleCategoryService.DeleteArticleCategoryAsync(id);
if (result)
return RedirectToAction("Index");
else
return BadRequest("删除失败");
}
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> DeleteAll(string[] ids)
{
int countSuccessDel = 0;//记录删除成功的数据条数
int countFailedDel = 0;//记录删除成功的数据条数
foreach (string id in ids)
{
if (await _articleCategoryService.DeleteArticleCategoryAsync(int.Parse(id)))
countSuccessDel++;
else
countFailedDel++;
}
if (countSuccessDel > 0)
return RedirectToAction("Index");
else
return BadRequest("删除失败");
}
public async Task<IActionResult> Details(int id)
{
if (string.IsNullOrEmpty(id.ToString()))
return NotFound();
var articleCategory = await _articleCategoryService.FindArticleCategoryAsync(id);
if (articleCategory == null)
return NotFound();
return View(articleCategory);
}
[HttpGet]
public async Task<IActionResult> GetCategory()
{
var items = await _articleCategoryService.GetArticleCategory();
return View(items);
}
public IActionResult GetParentName(int id)
{
var category = _appDbContext.ArticleCategory.Where(x => x.Id == id).FirstOrDefault();
if (category != null)
return Content(category.Title);
else
return Content("");
}
}

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public interface IArticleCategoryService
{
Task<ArticleCategory[]> GetArticleCategory();
Task<ArticleCategory[]> GetArticleCategoryByParentId(int pId);
Task<ArticleCategory> FindArticleCategoryAsync(int Id);
Task<bool> AddArticleCategoryAysnc(ArticleCategory menu);
Task<bool> UpdateArticleCategoryAsync(int id, ArticleCategory menu);
Task<bool> DeleteArticleCategoryAsync(int Id);
}

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public class ArticleCategoryService : IArticleCategoryService
{
private readonly AppDbContext _appDbContext;
public ArticleCategoryService(AppDbContext appDbContext)
{
_appDbContext = appDbContext;
}
public async Task<bool> AddArticleCategoryAysnc(ArticleCategory articleCategory)
{
articleCategory.IsDeleted = false;
if (articleCategory.ParentId == 0)
articleCategory.ClassLayer = 1;
else
articleCategory.ClassLayer = 2;
await _appDbContext.ArticleCategory.AddAsync(articleCategory);
var result = await _appDbContext.SaveChangesAsync();
return result == 1;
}
public async Task<bool> DeleteArticleCategoryAsync(int Id)
{
var articleCategory = await _appDbContext.ArticleCategory.FirstOrDefaultAsync(x => x.Id == Id);
if (articleCategory != null)
{
_appDbContext.ArticleCategory.Remove(articleCategory);
}
var result = await _appDbContext.SaveChangesAsync();
return result == 1; //注意(result==1 如果等式成立，则返回true，说明删除成功)
}
public async Task<ArticleCategory> FindArticleCategoryAsync(int Id)
{
var item = await _appDbContext.ArticleCategory.Where(x => x.Id == Id).FirstOrDefaultAsync();
return item;
}
public async Task<ArticleCategory[]> GetArticleCategory()
{
var items = await _appDbContext.ArticleCategory.Where(x => x.IsDeleted==false).OrderByDescending(x => x.Sort).ToArrayAsync();
return items;
}
public async Task<ArticleCategory[]> GetArticleCategoryByParentId(int pId)
{
var items = await _appDbContext.ArticleCategory.Where(x => x.ParentId == pId).OrderByDescending(x => x.Sort).ToArrayAsync();
return items;
}
public async Task<bool> UpdateArticleCategoryAsync(int id, ArticleCategory articleCategory)
{
var oldArticleCategory = await FindArticleCategoryAsync(id); //找出旧对象
//将新值赋到旧对象上
oldArticleCategory.Title = articleCategory.Title;
oldArticleCategory.ParentId = articleCategory.ParentId;
oldArticleCategory.Sort = articleCategory.Sort;
//对旧对象执行更新
_appDbContext.Entry(oldArticleCategory).State = EntityState.Modified;
var result = await _appDbContext.SaveChangesAsync();
return result == 1;
}
}

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