您可以使用Azure Active Directory图形客户端获取用户缩略图照片

var servicePoint = new Uri("https://graph.windows.net");
// e.g. xxx.onmicrosoft.com
var serviceRoot = new Uri(servicePoint, "<your tenant>"); 

// ClientID and SecretKey are defined when you register application
// with Azure AD
const string clientId  = "<clientId>";
const string secretKey = "<secretKey>";

var authContext = new AuthenticationContext("https://login.windows.net/<tenant>/oauth2/token");
var credential  = new ClientCredential(clientId, secretKey);

ActiveDirectoryClient directoryClient = new ActiveDirectoryClient(serviceRoot, async () => {
    var result = await authContext.AcquireTokenAsync("https://graph.windows.net/", credential);
    return result.AccessToken;
});

var user = await directoryClient.Users
    .Where(x => x.UserPrincipalName == "<username>")
    .ExecuteSingleAsync();

DataServiceStreamResponse photo = await user.ThumbnailPhoto.DownloadAsync();

using (MemoryStream s = new MemoryStream()){
    photo.Stream.CopyTo(s);
    var encodedImage = Convert.ToBase64String(s.ToArray());
}

字符串
Azure AD以二进制格式返回用户的照片，您需要转换为Base64字符串

不支持通过图形资源管理器获取照片。假设“signedInUser”已经包含了已登录的用户实体，那么这个使用客户端库的代码片段应该对您有用……

#region get signed in user's photo
        if (signedInUser.ObjectId != null)
        {
            IUser sUser = (IUser)signedInUser;
            IStreamFetcher photo = (IStreamFetcher)sUser.ThumbnailPhoto;
            try
            {
                DataServiceStreamResponse response =
                photo.DownloadAsync().Result;
                Console.WriteLine("\nUser {0} GOT thumbnailphoto", signedInUser.DisplayName);
            }
            catch (Exception e)
            {
                Console.WriteLine("\nError getting the user's photo - may not exist {0} {1}", e.Message,
                    e.InnerException != null ? e.InnerException.Message : "");
            }
        }
        #endregion

字符串
或者，你可以通过REST来实现这一点，它应该看起来像这样：GET https://graph.windows.net/myorganization/users/ /thumbnailPhoto？api-version=1.5希望这能有所帮助，

根据Azure AD Graph API Docs，微软建议过渡到Microsoft Graph，因为Azure AD Graph API正在逐步淘汰。
但是，要通过Azure AD轻松获取照片，现在请使用此URL模板：
第一个月
例如（这是一个假的用户ID）：
https://graph.windows.net/myorganization/users/abc1d234-01ab-1a23-12ab-abc0d123e456/thumbnailPhoto?api-version=1.6个
下面的代码假设您已经有一个经过身份验证的用户，并带有令牌。这是一个过于简单的例子;你会想要改变返回值来满足你的需要，添加错误检查等等。

const string ThumbUrl = "https://graph.windows.net/myorganization/users/{0}/thumbnailPhoto?api-version=1.6";

// Attempts to retrieve the thumbnail image for the specified user, with fallback.
// Returns: Fully formatted string for supplying as the src attribute value of an img tag.
private string GetUserThumbnail(string userId)
{
    string thumbnail = "some base64 encoded fallback image";
    string mediaType = "image/jpg"; // whatever your fallback image type is
    string requestUrl = string.Format(ThumbUrl, userId);

    HttpClient client = new HttpClient();
    client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", GetToken());
    HttpResponseMessage response = client.GetAsync(requestUrl).Result;

    if (response.IsSuccessStatusCode)
    {
        // Read the response as a byte array
        var responseBody = response.Content.ReadAsByteArrayAsync().GetAwaiter().GetResult();

        // The headers will contain information on the image type returned
        mediaType = response.Content.Headers.ContentType.MediaType;

        // Encode the image string
        thumbnail = Convert.ToBase64String(responseBody);
    }

    return $"data:{mediaType};base64,{thumbnail}";
}

// Factored out for use with other calls which may need the token
private string GetToken()
{
    return HttpContext.Current.Session["Token"] == null ? string.Empty : HttpContext.Current.Session["Token"].ToString();
}

字符串