asp.net Identity2 角色(Role)的使用（二）角色管理，角色控制器和视图

新建一个AdminViewModel 文件，建立视图模型类

public class RoleViewModel
{
public string Id { get; set; }

[Required(AllowEmptyStrings=false)]
[Display(Name="角色名称")]
public string Name { get; set; }

[Display(Name="角色描述")]
[StringLength(50,ErrorMessage="{0}不能超过50个字符")]
[DataType(DataType.MultilineText)]
public string Description { get; set; }
}

新建一个角色控制器RoleAdminController，并初始化UserManager值。

public class RoleAdminController : Controller
{
public RoleAdminController()
{ }

//构造函数注入;
public RoleAdminController(ApplicationUserManager userManager, ApplicationRoleManager roleManager)
{
UserManager = userManager;
RoleManager = roleManager;
}

//定义字段
private ApplicationUserManager _userManager;

public ApplicationUserManager UserManager
{
get
{
return _userManager ?? HttpContext.GetOwinContext().GetUserManager<ApplicationUserManager>();//Microsoft.AspNet.Identity.Owin 命名空间下。 空值合并运算符。
}
set
{
_userManager = value;
}
}

private ApplicationRoleManager _roleManager;

public ApplicationRoleManager RoleManager
{
get
{
return _roleManager ?? HttpContext.GetOwinContext().Get<ApplicationRoleManager>();
}
set
{
_roleManager = value;
}
}

角色列表   要想在角色首页中列表每个角色的用户

模型：

public class IndexRoleViewModel
{
public string Id { get; set; }

[Required(AllowEmptyStrings = false)]
[Display(Name = "角色名称")]
public string Name { get; set; }

[Display(Name = "角色描述")]
[StringLength(50, ErrorMessage = "{0}不能超过50个字符")]
[DataType(DataType.MultilineText)]
public string Description { get; set; }

public List<ApplicationUser> ApplicationUsers { get; set; }

}

}

控制器
// GET: Admin/RoleAdmin
public async Task<ActionResult> Index()
{
var rolesList =new List<IndexRoleViewModel>();
foreach (var role in await RoleManager.Roles.ToListAsync())
{
var _IndexRoleViewModel = new IndexRoleViewModel()
{
Id = role.Id,
Name = role.Name,
Description = role.Description,
ApplicationUsers =new List<ApplicationUser>() //特别注意，初始化一个空的List泛型集合。如果不初始化，将为触发一个引用为Null的异常。
};

foreach (var user in await UserManager.Users.ToListAsync())
{
if (UserManager.IsInRole(user.Id,role.Name))  //遍历用户，如果该用户有此角色，就将此用户加入到集合中。
{
_IndexRoleViewModel.ApplicationUsers.Add(user);
}
}

rolesList.Add(_IndexRoleViewModel); //最后将此ViewModel 加入到列表中，返回给视图。
}

return View(rolesList.ToList()); //异步方法在 System.Data.Entity命名空间下面。
}

视图：

@model IEnumerable<MajorConstruction.Areas.Admin.Models.IndexRoleViewModel>

@{
ViewBag.Title = "角色列表";
}
<h2>@ViewBag.Title</h2>
<hr />

<table class="table table-striped table-hover">
<thead>
<tr>
<th>
@Html.DisplayName("角色名称")
</th>
<th>
@Html.DisplayNameFor(model => model.Description)
</th>
<th>@Html.DisplayName("拥有此角色的成员")</th>
<th></th>
</tr>
</thead>
<tbody>
@foreach (var item in Model)
{
<tr>
<td>
@Html.DisplayFor(modelItem => item.Name)
</td>
<td>
@Html.DisplayFor(modelItem => item.Description)
</td>
<td>
<ol>
@foreach (var userForRole in item.ApplicationUsers)
{
<li>@userForRole.UserName | @userForRole.RealName</li>
}
</ol>
</td>
<td>
@Html.ActionLink("编辑", "Edit", new { id = item.Id }) |
@Html.ActionLink("详细", "Details", new { id = item.Id })
</td>
</tr>
}
</tbody>
</table>

角色详细信息

控制器：

// GET: Admin/RoleAdmin/Details/5
public async Task<ActionResult> Details(string id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}

var role = await RoleManager.FindByIdAsync(id);
if (role == null)
{
return HttpNotFound();
}

var users = new List<ApplicationUser>(); //首先要定义一个List泛型容器，用来存放User。
foreach (var user in UserManager.Users.ToList())
{
if(await UserManager.IsInRoleAsync(user.Id,role.Name))
{
users.Add(user);
}

}
ViewBag.Users = users;  //如果只是一个集合，可以不使用ViewModel ,而是使用ViewBag动态对象，将数据带入View中。
ViewBag.UserCount = users.Count();
return View(role);
}

视图：

@model MajorConstruction.Areas.Admin.Models.ApplicationRole
@{
ViewBag.Title = "角色详细信息";
}
<h2>@ViewBag.Title</h2>
<hr />
<div>
<dl class="dl-horizontal">
<dt>
角色名称
</dt>

<dd>
@Html.DisplayFor(model => model.Name)
</dd>

<dt>
@Html.DisplayNameFor(model => model.Description)
</dt>

<dd>
@Html.DisplayFor(model => model.Description)
</dd>

</dl>
</div>
<h4>拥有此角色的所有成员</h4>
@if (ViewBag.UserCount == 0)
{
<hr />
<p>没有用户拥有此角色</p>
}
<table class="table table-striped table-hover">
<tr>
<th>用户名</th>
<th>姓名</th>
<th>性别</th>
<th>邮箱</th>
</tr>
@foreach (var item in ViewBag.Users )
{
<tr>
<td>@item.UserName</td>
<td>@item.RealName</td>
<td>@item.Gender</td>
<td>@item.Email</td>
</tr>
}

</table>
<p>
@Html.ActionLink("编辑", "Edit", new { id = Model.Id }) |
@Html.ActionLink("返回角色列表", "Index")
</p>

编辑角色: 可以使用T4模板快速生成，没有特别的地方。

控制器：

public async Task<ActionResult> Edit(string id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
var role = await RoleManager.FindByIdAsync(id);
if (role == null)
{
return HttpNotFound();
}

RoleViewModel roleViewModel = new RoleViewModel { Id = role.Id, Name = role.Name, Description = role.Description };
return View(roleViewModel);
}

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Edit([Bind(Include = "Id,Name,Description")] RoleViewModel roleModel)
{
if (ModelState.IsValid)
{
var role = await RoleManager.FindByIdAsync(roleModel.Id);
role.Name = roleModel.Name;
role.Description = roleModel.Description;
await RoleManager.UpdateAsync(role);
return RedirectToAction("Index");
}
return View(roleModel);
}

视图：

@model MajorConstruction.Areas.Admin.Models.RoleViewModel

@{
ViewBag.Title = "编辑角色";
}
<h2>@ViewBag.Title</h2>
<hr />
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()

<div class="form-horizontal">
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
@Html.HiddenFor(model => model.Id)
@Html.HiddenFor(model =>model.Name)

<div class="form-group">
@Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
<p class="form-control-static">@Html.DisplayFor(model =>model.Name)</p>
</div>
</div>

<div class="form-group">
@Html.LabelFor(model => model.Description, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.Description, new { htmlAttributes = new { @class = "form-control",rows="5" } })
@Html.ValidationMessageFor(model => model.Description, "", new { @class = "text-danger", })
</div>
</div>

<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="保存" class="btn btn-default" />
</div>
</div>
</div>
}

<div>
@Html.ActionLink("返回角色列表", "Index")
</div>

@section Scripts {
@Scripts.Render("~/bundles/jqueryval")
}

删除角色和新建角色 和Vs 自动生成的没有两样，在一般的后台控制管理系统中，权限角色的授权都是写死在程序中，所以没有必要提供新建角色和删除角色的功能，只需要在角色初始化器中初始化就可以了。

但是，如果是在动态分配角色权限，比如某个角色对某个操作有查看的权限，就需要有增和删的功能了。