你好社区我有一个问题如何使用usermanager in a blazor页面网络组装？通过注入：
@inject UserManager<ApplicationUser> UserManager;
我收到指示，表明缺少使用指令，因为 ApplicationUser 类位于服务器上，并且客户端无权访问服务器。
这是我在 blazor 页面中的代码：
@page "/index"
@inject AuthenticationStateProvider AuthenticationStateProvider
@using Microsoft.AspNetCore.Identity;
@inject UserManager<ApplicationUser> UserManager;
<button @onclick="@LogUsername">Write user info to console</button>
<br />
<br />
@Message
@code {
string Message = "";
private async Task LogUsername()
{
var authState = await AuthenticationStateProvider.GetAuthenticationStateAsync();
var user = authState.User;
if (user.Identity.IsAuthenticated)
{
var currentUser = await UserManager.GetUserAsync(user);
Message = ($"{user.Identity.Name} is authenticated.{ currentUser.Nombre }");
}
else
{
Message = ("The user is NOT authenticated.");
}
}
}
这是我的类 ApplicationUser：
public class ApplicationUser: IdentityUser
{
public string Nombre { get; set; }
public string ApellidoPaterno { get; set; }
public string ApellidoMaterno { get; set; }
public virtual Cliente InquilinoActual { get; set; }
}
你不能使用UserManager来自在浏览器上运行的 WebAssembly Blazor 应用程序。一般来说，您不能在 WebAssembly Blazor 应用中使用与数据库访问相关的对象。相反，您通常创建 Web Api 操作方法，并使用 Fetch API (HttpClient) 访问这些方法。
您想从 User 对象中获取什么值？
What is Nombre?
不管是什么Nombre，您可以添加该值（Nombre) 作为声明并从以下位置访问它authState.User
首先，您应该创建一个名为 ApplicationUserClaimsPrincipalFactory 的服务类，该服务类用于将 Users 表中的表列值转换为添加到传递给 Blazor 客户端的 ClaimsPrincipal 对象的声明。
using AuthenticationStateProviderCustomClaims.Server.Models;
using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.Options;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;
using System.Threading.Tasks;
public class ApplicationUserClaimsPrincipalFactory :
UserClaimsPrincipalFactory<ApplicationUser>
{
public ApplicationUserClaimsPrincipalFactory(UserManager<ApplicationUser> userManager,
IOptions<IdentityOptions> optionsAccessor) : base(userManager, optionsAccessor)
{
}
protected override async Task<ClaimsIdentity>
GenerateClaimsAsync(ApplicationUser user)
{
ClaimsIdentity claims = await
base.GenerateClaimsAsync(user);
claims.AddClaim(new Claim("name", user.Nombre));
return claims;
}
}
将以下内容放在 .AddDBContext 下方：
services.AddScoped<ApplicationUserClaimsPrincipalFactory>();
services.AddDefaultIdentity<ApplicationUser>(options => options.SignIn.RequireConfirmedAccount = true)
.AddRoles<IdentityRole>()
.AddEntityFrameworkStores<ApplicationDbContext>()
.AddClaimsPrincipalFactory<ApplicationUserClaimsPrincipalFactory>();
services.AddIdentityServer()
.AddApiAuthorization
// Note: This settings may be superfluous as the name claim
// is added by default.
options.IdentityResources["openid"].UserClaims.Add("name");
options.ApiResources.Single().UserClaims.Add("name");
});
services.AddAuthentication().AddIdentityServerJwt();
运行此代码并查看其是否工作...如果不工作，请发布完整的错误报告
@page "/"
@using System.Security.Claims
@using Microsoft.AspNetCore.Components.Authorization
@inject AuthenticationStateProvider AuthenticationStateProvider
<p>@_authMessage</p>
@if (_claims != null && _claims.Count() > 0)
{
<ul>
@foreach (var claim in _claims)
{
<li>@claim.Type: @claim.Value</li>
}
</ul>
}
<p>@_nombreMessage</p>
@code {
private string _authMessage;
private string _nombreMessage;
private IEnumerable<Claim> _claims = Enumerable.Empty<Claim>();
private async Task GetClaimsPrincipalData()
{
var authState = await AuthenticationStateProvider.GetAuthenticationStateAsync();
var user = authState.User;
if (user.Identity.IsAuthenticated)
{
_authMessage = $"{user.Identity.Name} is authenticated.";
_claims = user.Claims;
_nombreMessage =
$"Nombre: {user.FindFirst(c => c.Type == ClaimTypes.Name)?.Value}";
}
else
{
_authMessage = "The user is NOT authenticated.";
}
}
protected override async Task OnInitializedAsync()
{
await GetClaimsPrincipalData();
}
}