在Asp.Net WebForms中使用Owin启动类与IdentityServer4进行通信

using Microsoft.Owin;
using Owin;
using IdentityServer4;

[assembly: OwinStartup(typeof(YourNamespace.Startup))]

namespace YourNamespace
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.UseIdentityServer();
        }
    }
}

protected void Application_Start(object sender, EventArgs e)
{
    // 注册Owin启动类
    Microsoft.Owin.Hosting.WebApp.Start<YourNamespace.Startup>("http://localhost:5000");
}

public static IEnumerable<Client> GetClients()
{
    return new List<Client>
    {
        new Client
        {
            ClientId = "your_client_id",
            AllowedGrantTypes = GrantTypes.ClientCredentials,
            ClientSecrets =
            {
                new Secret("your_client_secret".Sha256())
            },
            AllowedScopes = { "your_api_scope" }
        }
    };
}

public static IEnumerable<ApiResource> GetApiResources()
{
    return new List<ApiResource>
    {
        new ApiResource("your_api_scope", "Your API")
    };
}

protected void Page_Load(object sender, EventArgs e)
{
    var client = new HttpClient();
    var disco = await client.GetDiscoveryDocumentAsync("http://localhost:5000");
    
    if (disco.IsError)
    {
        // 处理错误
    }
    
    var tokenResponse = await client.RequestClientCredentialsTokenAsync(new ClientCredentialsTokenRequest
    {
        Address = disco.TokenEndpoint,
        ClientId = "your_client_id",
        ClientSecret = "your_client_secret",
        Scope = "your_api_scope"
    });
    
    if (tokenResponse.IsError)
    {
        // 处理错误
    }
    
    var apiClient = new HttpClient();
    apiClient.SetBearerToken(tokenResponse.AccessToken);
    
    var response = await apiClient.GetAsync("your_api_endpoint");
    
    if (response.IsSuccessStatusCode)
    {
        var content = await response.Content.ReadAsStringAsync();
        // 处理响应内容
    }
    else
    {
        // 处理错误
    }
}