1. 在Blazor WebAssembly应用程序中安装IdentityServer4包。

2. 创建一个包含用户名的表单并向身份服务器发送请求以进行身份验证。示例代码如下：

@page "/login"
@using System.Net.Http
@using System.Text.Json
@inject HttpClient httpClient

Login


    

        Username
        
    

    

        Password
        
    

    Submit


@code {
    private string UserName { get; set; }
    private string Password { get; set; }

    private async Task Login()
    {
        var response = await httpClient.PostAsJsonAsync("https://localhost:5001/connect/token",
            new
            {
                client_id = "blazor",
                client_secret = "secret",
                grant_type = "password",
                scope = "api",
                username = UserName,
                password = Password
            });

        if (response.IsSuccessStatusCode)
        {
            var content = await response.Content.ReadAsStringAsync();
            var accessToken = JsonSerializer.Deserialize(content);

            // Store the access token
        }
        else
        {
            // Handle error
        }
    }

    class AccessToken
    {
        public string access_token { get; set; }
        public string token_type { get; set; }
        public int expires_in { get; set; }
    }
}

3. 在身份服务器上创建授权服务器端点，以便Blazor应用程序可以使用OAuth2对身份进行验证并获取访问令牌。示例代码如下：

public void ConfigureServices(IServiceCollection services)
{
    services.AddIdentity()
        .AddEntityFrameworkStores()
        .AddDefaultTokenProviders();

    services.AddIdentityServer()
        .AddDeveloperSigningCredential()
        .AddInMemoryApiResources(Config.GetApi