如何从Microsoft Graph SDK获取用户图像

// 引入必要的命名空间
using Microsoft.Graph;
using Microsoft.Identity.Client;
using System.IO;

// 创建一个GraphServiceClient对象
var graphClient = new GraphServiceClient(new DelegateAuthenticationProvider(async (requestMessage) =>
{
    // 使用适当的身份验证方式设置访问令牌
    var authenticationResult = await GetAccessToken();
    requestMessage.Headers.Authorization = new AuthenticationHeaderValue("bearer", authenticationResult.AccessToken);
}));

// 发起请求获取用户图像
using (var stream = await graphClient.Me.Photo.Content.Request().GetAsync())
{
    using (var fileStream = new FileStream("userphoto.jpg", FileMode.Create))
    {
        await stream.CopyToAsync(fileStream);
    }
}

// 获取访问令牌的方法（使用Microsoft.Identity.Client）
async Task<AuthenticationResult> GetAccessToken()
{
    // 填入相应的租户ID、客户端ID和客户端机密等信息
    var confidentialClientApplication = ConfidentialClientApplicationBuilder
        .Create("<client_id>")
        .WithClientSecret("<client_secret>")
        .WithAuthority(AzureCloudInstance.AzurePublic, "<tenant_id>")
        .Build();

    // 定义所需的作用域
    string[] scopes = new string[] { "User.Read", "User.ReadBasic.All" };

    // 使用适当的方式进行身份验证并获取访问令牌
    var authenticationResult = await confidentialClientApplication.AcquireTokenForClient(scopes).ExecuteAsync();

    return authenticationResult;
}