篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

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摘要

入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)前面几章讲了菜单功能的管理之后,我们再创建一个角色管理的功能,创建过程不再详细介绍,只要按照菜单管理功能的步骤进行创建即可;和前面讲的稍微不同的是,现在多了一个Service层和异步操作,功能处理的代码放在这个层完成,只在Controller中调用即可。

入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

前面几章讲了菜单功能的管理之后,我们再创建一个角色管理的功能,创建过程不再详细介绍,只要按照菜单管理功能的步骤进行创建即可;和前面讲的稍微不同的是,现在多了一个Service层和异步操作,功能处理的代码放在这个层完成,只在Controller中调用即可。

一、再讲角色的操作之前,我们先聊一个概念:ViewModel,或者叫DTO;两个是一个意思,叫法不一样而已。ViewModel是ASP.NET MVC应用中的隐式声明的层,用来维护Model和View之间的数据传递, 因此,ViewModel也简称为数据传输对象或 DTO。

我们举个简单的例子:我先以原来Menu菜单功能中的一个查看菜单明细Details来举例说明。

(1):其View代码(Details.cshtml)如下

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

(2):其Controller的Details Action代码如下:

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

(3):其预览效果为:

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

Controller传递到View视图的数据是item,并还定了一个ViewBag.PageTitle的数据,我想把ViewBag.PageTitle个跟随Model item一并传递到View,而且不用ViewBag的方式,那么我就新建一个ViewModel类型的Model,叫MenuView,它的代码是这样:

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

在Controller中改如何获取值:

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

在View中如何显示值:

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

以上就是一个ViewModel的简单应用例子,很好理解。

二、在接着说角色功能的例子,简单说下过程

1.创建角色数据表ManagerRole;

CREATE TABLE [dbo].[ManagerRole]( [Id] [int] IDENTITY(1,1) NOT NULL, [RoleName] [varchar](64) NOT NULL, [RoleType] [int] NOT NULL, [IsSystem] [bit] NOT NULL, [AddManagerId] [int] NOT NULL, [AddTime] [datetime] NOT NULL, [ModifyManagerId] [int] NULL, [ModifyTime] [datetime] NULL, [IsDelete] [bit] NOT NULL, [Remark] [varchar](128) NULL, CONSTRAINT [PK_MANAGERROLE] 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

 

2.编写角色Model,ManagerRole;

public class ManagerRole { /// <summary> /// 主键 /// </summary> [Key] public int Id { get; set; } /// <summary> /// 角色名称 /// </summary> [Required] public String RoleName { get; set; } /// <summary> /// 角色类型1超管2系管 /// </summary> [Required] public int RoleType { get; set; } /// <summary> /// 是否系统默认 /// </summary> [Required] public Boolean IsSystem { get; set; } /// <summary> /// 添加人 /// </summary> public int AddManagerId { get; set; } /// <summary> /// 添加时间 /// </summary> public DateTime AddTime { get; set; } /// <summary> /// 修改人 /// </summary> public int? ModifyManagerId { get; set; } /// <summary> /// 修改时间 /// </summary> public DateTime? ModifyTime { get; set; } /// <summary> /// 是否删除 /// </summary> public Boolean IsDelete { get; set; } /// <summary> /// 备注 /// </summary>  public String Remark { get; set; }

 

3.编写角色Controller[ManagerRoleController.cs]和View;

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

(3.1)Index.cshtml的View视图代码

@using RjWebCms.Db; @model PaginatedList<ManagerRole> @{ ViewData["Title"] = "角色列表"; } @section Scripts{ <script type="text/javascript"> $(document).ready(function () { $("a[name='DelAll']").click(function (){ DelAll(); }); }); function DelAll() { var ids = document.getElementsByName("chk_ids"); var arrIds = ""; var n = 0; for (var i = 0; i < ids.length; i++) { if (ids[i].checked == true) { arrIds += ids[i].value + ","; n++; } }  if (n == 0) { alert("请选择要删除的信息"); return; }  arrIds = arrIds.substr(0, arrIds.length - 1); $.ajax({ type: "POST", url: "/ManagerRole/DeleteAll", data: { idString: arrIds }, beforeSend: function (xhr) { xhr.setRequestHeader("RequestVerificationToken", $('input:hidden[name="__RequestVerificationToken"]').val()); },  success: function (res) { alert('删除成功!'); window.location.href = "/ManagerRole/Index"; }, failure: function (data, error) { alert('删除失败'); } }); }  function del() { $.ajax({ type: "POST", url: "/ManagerRole/Details", data: {id:8}, beforeSend: function (xhr) { xhr.setRequestHeader("RequestVerificationToken", $('input:hidden[name="__RequestVerificationToken"]').val()); },  success: function (response) { alert('OK'); alert(response); },  failure: function (response) { alert(response); } }); } </script> } <div class="panel panel-default todo-panel"> <div class="panel-heading">@ViewData["Title"]</div> @Html.AntiForgeryToken() <form asp-action="Index" method="get"> <table> <tr><td><a asp-controller="ManagerRole" 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 id="DelAll" name="DelAll">批量删除</a></td> </tr> </table> </form> <table class="table table-hover"> <thead> <tr> <td>&#x2714;</td> <td><a asp-action="Index" asp-route-sortOrder="@ViewData["NameSortParm"]" asp-route-currentFilter="@ViewData["CurrentFilter"]">角色名称</a></td> <td>角色类型</td> <td><a asp-action="Index" asp-route-sortOrder="@ViewData["DateSortParm"]" asp-route-currentFilter="@ViewData["CurrentFilter"]">时间</a></td> <td>操作</td> </tr> @foreach (var item in Model) { <tr> <td><input type="checkbox" class="done-checkbox" name="chk_ids" value="@item.Id"></td> <td>@item.RoleName</td> <td>@item.RoleType</td> <td>@item.AddTime</td> <td> <a asp-controller="ManagerRole" asp-action="Details" asp-route-id="@item.Id">View</a> <a asp-action="Edit" asp-route-id="@item.Id">Edit</a> <a asp-controller="RolePermission" asp-action="Index" asp-route-id="@item.Id">Menu</a> <a asp-controller="ManagerRole" 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> <div class="panel-footer add-item-form"> <!-- TODO: Add item form --> </div> </div>

 

(3.2)Create.cshtml视图代码

@{ ViewData["Title"] = "新建角色"; } @model ManagerRole <form action="/ManagerRole/Create" method="post"> @Html.AntiForgeryToken() <div> <label asp-for="RoleName">角色名称</label> <div> <input type="text" asp-for="RoleName" name="RoleName" placeholder="请输入角色名称"> </div> </div> <div> <label asp-for="RoleType">角色类型</label> <div> <select name="RoleType" class="RoleType"> <option value="1">超级管理员</option> <option value="2" selected>系统管理员</option> </select> </div> </div> <div> <label asp-for="IsSystem">系统默认</label> <div> <select asp-for="IsSystem" name="IsSystem" class="IsSystem"> <option value="False" selected></option> <option value="True"></option> </select> </div> </div> <div> <label asp-for="Remark">备注</label> <div> <textarea placeholder="请输入备注信息" asp-for="Remark" name="Remark"></textarea> </div> </div> <div> <div> <button type="submit">确定</button> <button type="reset">重置</button> </div> </div> </form>

 

(3.3)Edit.cshtml视图代码

@{ ViewData["Title"] = "角色编辑"; } @model ManagerRole <form action="/ManagerRole/Edit" method="post"> @Html.AntiForgeryToken() <input type="hidden" asp-for="Id" /> <div> <label asp-for="RoleName">角色名称</label> <div> <input type="text" asp-for="RoleName" name="RoleName" class="layui-input RoleName" lay-verify="required" placeholder="请输入角色名称"> </div> </div> <div> <label asp-for="RoleType">角色类型</label> <div> <select name="RoleType" class="RoleType"> <option value="1" selected="@(Model.RoleType == 1 ? " selected" : null)">超级管理员</option> <option value="2" selected="@(Model.RoleType == 2 ? " selected" : null)">系统管理员</option> </select> </div> </div> <div> <label asp-for="IsSystem">系统默认</label> <div> <select asp-for="IsSystem" name="IsSystem" class="IsSystem"> <option value="false" selected="@(Model.IsSystem==false ? " selected" : null)"></option> <option value="true" selected="@(Model.IsSystem==true ? " selected" : null)"></option> </select> </div> </div> <div> <label asp-for="Remark">备注</label> <div> <textarea placeholder="请输入备注信息" asp-for="Remark" name="Remark" class="layui-textarea Remark"></textarea> </div> </div> <div> <div> <button type="submit">确定</button> <button type="reset">重置</button> </div> </div> </form>

 

(3.4)ManagerController.cs控制器代码如下,注意各个Action的类型声明,在Index这个Action上,我加了个[Authorize]声明,意思是,如果你要查看角色,必须是登录用户才行。

public class ManagerRoleController : Controller { private readonly IManagerRoleService _roleService; private readonly AppDbContext _appDbContext; public ManagerRoleController(IManagerRoleService roleService, AppDbContext appDbContext) { _roleService = roleService; _appDbContext = appDbContext; }  [Authorize] 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 == "Date" ? "date_desc" : "Date"; if (searchString != null) { pageNumber = 1; } else { searchString = currentFilter; } ViewData["CurrentFilter"] = searchString; var mRoles = from s in _appDbContext.ManagerRole select s; if (!string.IsNullOrEmpty(searchString)) { mRoles = mRoles.Where(s => s.RoleName.Contains(searchString)); }  switch (sortOrder) { case "name_desc": mRoles = mRoles.OrderByDescending(s => s.RoleName); break; case "Date": mRoles = mRoles.OrderBy(s => s.AddTime); break; case "date_desc": mRoles = mRoles.OrderByDescending(s => s.AddTime); break; default: mRoles = mRoles.OrderBy(s => s.RoleName); break; }  int pageSize = 4; return View(await PaginatedList<ManagerRole>.CreateAsync(mRoles.AsNoTracking(), pageNumber ?? 1, pageSize)); }  [HttpGet] public IActionResult Create() { return View(); }  [HttpPost] [ValidateAntiForgeryToken] public async Task<IActionResult> Create(ManagerRole mRole) { //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 (ModelState.IsValid) { var successful = await _roleService.AddManagerRoleAysnc(mRole); if (successful) return RedirectToAction("RoleList"); else return BadRequest("失败"); } return View(mRole); }  [HttpGet] public async Task<IActionResult> Edit(int id) { if (string.IsNullOrEmpty(id.ToString())) return NotFound(); var mRole = await _roleService.FindManagerRoleAsync(id); if (mRole == null) return NotFound(); return View(mRole); }  [HttpPost] [ValidateAntiForgeryToken] public async Task<IActionResult> Edit(int id,ManagerRole mRole) { if (id != mRole.Id) { return NotFound(); } if (ModelState.IsValid) { try { var result = await _roleService.UpdateManagerRoleAsync(id,mRole); } catch (Exception ex) { return BadRequest("编辑失败"); } return RedirectToAction("Index"); } return View(mRole); }  [HttpGet] public async Task<IActionResult> Delete(int id) { var result = await _roleService.DeleteManagerRoleAsync(id); if (result) return RedirectToAction("Index"); else return BadRequest("删除失败"); }  [HttpPost] [ValidateAntiForgeryToken] public async Task<IActionResult> DeleteAll(string idString) { 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 if (idString.Length > 0) { if (idString.IndexOf(',') > 0) { string[] ids = idString.Split(','); foreach (string id in ids) { var result = await _roleService.DeleteManagerRoleAsync(int.Parse(id)); if(result) countSuccessDel++; else countFailedDel++; } if (countSuccessDel > 0) return RedirectToAction("Index"); else return BadRequest("删除失败"); } } return BadRequest("失败"); }  [HttpGet] public async Task<IActionResult> Details(int id) { if (string.IsNullOrEmpty(id.ToString())) return NotFound(); var mRole = await _roleService.FindManagerRoleAsync(id); if (mRole == null) return NotFound(); return View(mRole); } }

 

(3.5)给角色赋权菜单

在列表页,也就是Index的Action内对其进行分页和添加相关的增、删、改、查的按钮,列表页多一个设置菜单的按钮(Menu),点击Menu按钮的目的是为了给这个角色赋予菜单的权限,这是权限管理控制到菜单级别的一种处理方式。

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

我在菜单列表页(Index.cshtml)中Menu的链接我是这样写的如下图:

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

链接到新的Controller和对应的Action:RolePermission是表[RolePermission]对应的Controller,它存储了角色Id与菜单Id的关系;

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

一个角色如何设置和编辑其具有哪些菜单的页面视图如下:

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

(3.6)上面设置角色菜单的这个页面的View代码如下(从这里开始那么涉及到了ViewModel的功能),可以看@model指令,我引入了一个MenuView,这是一个ViewModel类型,因为需要集合数据,单纯的一个Menu无法满足我的数据显示和操作,看完View代码,请注意对应的Controller代码:

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

@model MenuView @{ ViewData["Title"] = "设置角色的权限菜单"; } @section Scripts{ <script type="text/javascript" src="~/js/jquery-3.6.1.min.js"></script> <script type="text/javascript"> $(document).ready(function () { $("#btnSave").click(function () { SetCheckBoxSelected(); }); }); function SetCheckBoxSelected() { var ids = document.getElementsByName("Cbox_H"); var arrIds = ""; var n = 0; for (var i = 0; i < ids.length; i++) { if (ids[i].checked == true) { arrIds += ids[i].value + ","; n++; } } if (n == 0) { alert("请选择要设置的权限菜单"); return; } arrIds = arrIds.substr(0, arrIds.length - 1);//选择的菜单id集合 var roleId = document.getElementById("hidden_roleid").value; //角色id $.ajax({ type: "POST", url: "/RolePermission/Edit", data: { idString: arrIds, roleid: roleId }, beforeSend: function (xhr) { xhr.setRequestHeader("RequestVerificationToken", $('input:hidden[name="__RequestVerificationToken"]').val()); }, success: function (res) { alert('设置成功!'); //window.location.href = "/RolePermission/Index"; }, failure: function (data, error) { alert('删除失败'); } }); } </script> }  <div class="panel panel-default todo-panel"> <div class="panel-heading">@ViewData["Title"]</div> @Html.AntiForgeryToken() <div> 当前角色:<label id="lab_rolename">@ViewData["roleName"]</label> <button type="button" id="btnSave">保存</button> <input type="hidden" id="hidden_roleid" value="@ViewData["roleId"]"/> </div>  <table class="table table-hover"> <thead> <tr> <td>系统类别</td> <td>菜单名称</td> </tr> @foreach (var item in Model.MenuList) { if (item.ParentId == 0) { <tr> <td> <input type="checkbox" name="Cbox_H" value="@item.Id" @(Html.Raw(Model.MenuIds.Contains(item.Id)? "checked="checked"" : "")) /> @item.DisplayName &nbsp; </td> <td>&nbsp;</td> </tr> } else { <tr> <td>&nbsp;</td> <td> <input type="checkbox" name="Cbox_H" value="@item.Id" @(Html.Raw(Model.MenuIds.Contains(item.Id) ? "checked="checked"" : "")) /> @item.DisplayName </td> </tr> } } </thead> </table> <div class="panel-footer add-item-form"> <!-- TODO: Add item form --> </div> </div>

 

这里着重理解一下代码:<input type="checkbox" name="Cbox_H" value="@item.Id"

@(Html.Raw(Model.MenuIds.Contains(item.Id) ? "checked="checked"" : "")) />

就是复选框赋值问题:通过三元运算,判断当前RoleId下有这个MenuId,则选中复选框,没有这个MenuId,就置空。

简单说下处理逻辑:

(1).视图页面将列出所有菜单名称(带复选框);点开本页就只有一种操作-编辑;

(2).编辑时,需要先将原有选择保存过的显示勾选上,然后可再勾选编辑保存;

 

(3.7)权限勾选菜单设置的Controller操作代码,

3.7.1 先看MenuView代码

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

3.7.2再看RolePermissionController.cs的代码

public class RolePermissionController : Controller { private readonly IRolePermissionService _rolePermissionService; private readonly IManagerRoleService _managerRoleService; private readonly IMenuService _menuService; private readonly AppDbContext _appDbContext; public RolePermissionController(IRolePermissionService rolePermissionService, IManagerRoleService managerRoleService,IMenuService menService,AppDbContext appDbContext) { _rolePermissionService = rolePermissionService; _managerRoleService = managerRoleService; _menuService = menService; _appDbContext = appDbContext; }  public async Task<IActionResult> IndexAsync(int id) { ViewData["roleId"] = id; var ManagerRole = await _managerRoleService.FindManagerRoleAsync(id); if (ManagerRole != null) ViewData["roleName"] = ManagerRole.RoleName; else ViewData["roleName"] = "未知角色"; #region 查出已经分派权限的roleId 对应的MenuId 参数id=角色id List<int> menuIds = new List<int>(); menuIds.Add(-1); if (!string.IsNullOrEmpty(id.ToString())) { var rolepermissions = await _rolePermissionService.GetRolePermissionAsync(id); foreach (RolePermission rp in rolepermissions) { menuIds.Add(rp.MenuId); } } #endregion #region 绑定前台CheckBox var items = await _menuService.GetMenusByParentId(0); List<Menu> lists = new List<Menu>(); List<RolePermission> listRolePermission = new List<RolePermission>(); foreach (Menu m in items) { lists.Add(m); var items2 = await _menuService.GetMenusByParentId(m.Id); foreach (Menu mu in items2) { lists.Add(mu); } } var model = new MenuView() { MenuList = lists, MenuIds = menuIds }; return View(model); #endregion }  public async Task<IActionResult> EditAsync(int roleid,string idString) { string Msg = "保存成功"; #region 先删除旧的 await _rolePermissionService.DeleteRolePermissionByRoleId(roleid); #endregion #region 再添加新的 if (idString.Length > 0) { if (idString.IndexOf(',') > 0) { string[] ids = idString.Split(','); List<RolePermission> rps = new List<RolePermission>(); foreach (string id in ids) { RolePermission rp = new RolePermission(); rp.RoleId = roleid; rp.MenuId = int.Parse(id); rps.Add(rp); } await _rolePermissionService.AddRolePermissionAsync(rps); } } #endregion return View(Msg); } }

 

代码折叠起来读,就很好理解了。关于return View(Msg),这是个简单处理,以后将统一返回Json或标准信息时,在详细讲解,你可以做这个Action转向,或Return Ok();

(3.8)其中RolePermission对应的Service代码如下:

篇(14)-Asp.Net Core入门实战-权限管理之角色编辑和赋权(ViewModel-DTO初探)

public class RolePermissionService : IRolePermissionService { private readonly AppDbContext _appDbContext; public RolePermissionService(AppDbContext appDbContext) { _appDbContext = appDbContext; }  public async Task<bool> AddRolePermissionAsync(RolePermission rolePermission) { await _appDbContext.RolePermission.AddAsync(rolePermission); var result = await _appDbContext.SaveChangesAsync(); return result == 1; }  public async Task<bool> AddRolePermissionAsync(List<RolePermission> rps) { await _appDbContext.RolePermission.AddRangeAsync(rps); var result = await _appDbContext.SaveChangesAsync(); return result == 1; } public async Task<bool> DeleteRolePermissionAsync(int Id) { var delRolePermission = await _appDbContext.RolePermission.FirstOrDefaultAsync(x => x.Id == Id); if (delRolePermission != null) { _appDbContext.RolePermission.Remove(delRolePermission); } 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<bool> DeleteRolePermissionByRoleId(int roleId) { List<RolePermission> delRolePermissions = await _appDbContext.RolePermission.Where(x => x.RoleId == roleId).ToListAsync(); if (delRolePermissions != null) { foreach(RolePermission rp in delRolePermissions) _appDbContext.RolePermission.Remove(rp); }  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) }  /// <summary> /// 查看一个角色与菜单ID对应关系 /// </summary> /// <param name="Id"></param> /// <returns></returns> public async Task<RolePermission> FindRolePermissionAsync(int Id) { var item = await _appDbContext.RolePermission.Where(x => x.Id == Id).FirstOrDefaultAsync(); return item; }  /// <summary> /// 获取所有角色和菜单 /// </summary> /// <returns></returns> public async Task<RolePermission[]> GetRolePermissionAsync() { var items = await _appDbContext.RolePermission.ToArrayAsync(); return items; } /// <summary> /// 获取一个角色的所有菜单 /// </summary> /// <param name="roleId"></param> /// <returns></returns> public async Task<RolePermission[]> GetRolePermissionAsync(int roleId) { var items = await _appDbContext.RolePermission.Where(x => x.RoleId == roleId).ToArrayAsync(); return items; }  /// <summary> /// 更新角色权限 /// </summary> /// <param name="id"></param> /// <param name="rolePermission"></param> /// <returns></returns>  public async Task<bool> UpdateRolePermissionAsync(int id, RolePermission rolePermission) { var oldRolePermission = await FindRolePermissionAsync(id); //找出旧对象 //将新值赋到旧对象上 oldRolePermission.MenuId = rolePermission.MenuId; oldRolePermission.RoleId = rolePermission.RoleId; oldRolePermission.Permission = rolePermission.Permission; //对旧对象执行更新 _appDbContext.Entry(oldRolePermission).State = EntityState.Modified; var result = await _appDbContext.SaveChangesAsync(); return result == 1; }  }

 

注意有批量添加的功能,读代码时可稍加留意。