将照片从 Microsoft Graph 客户端 SDK 转换为 Base64String

Question

我正在使用对 Microsoft Graph 的 httpClient 调用的旧实现来获取用户的照片。以下代码可以工作，但我现在使用的是 Graph Client SDK，并且操作略有不同。我在转换代码时遇到了困难，因为在线示例和其他参考文献似乎没有相同的方法。

旧代码：

var response = await httpClient.GetAsync($"{webOptions.GraphApiUrl}/beta/me/photo/$value");
byte[] photo = await response.Content.ReadAsByteArrayAsync();
return Convert.ToBase64String(photo);

新代码：

var graphServiceClient = await graphClient.GetAuthenticatedGraphClientAsync(HttpContext);
Stream photo = await graphServiceClient.Me.Photo.Content.Request().GetAsync();

我已经尝试过这里和这里的示例，但我有点迷失，因为ReadAsByteArrayAsync()在新对象上不可用photo。

Answer 1

由于端点支持将照片内容作为唯一msgraph-sdk-dotnet的返回Get photoStream

public interface IProfilePhotoContentRequest : IBaseRequest
{
    /// <summary>Gets the stream.</summary>
    /// <returns>The stream.</returns>
    Task<Stream> GetAsync();

    /// <summary>Gets the stream.</summary>
    /// <param name="cancellationToken">The <see cref="T:System.Threading.CancellationToken" /> for the request.</param>
    /// <param name="completionOption">The <see cref="T:System.Net.Http.HttpCompletionOption" /> to pass to the <see cref="T:Microsoft.Graph.IHttpProvider" /> on send.</param>
    /// <returns>The stream.</returns>
    Task<Stream> GetAsync(
      CancellationToken cancellationToken,
      HttpCompletionOption completionOption = HttpCompletionOption.ResponseContentRead);

    //...
}

而Convert.ToBase64StringMethod接受一个字节数组，下面的例子演示了如何转换原始例子：

var graphServiceClient = await graphClient.GetAuthenticatedGraphClientAsync(HttpContext);
var photoStream = await graphServiceClient.Me.Photo.Content.Request().GetAsync();
var photoBytes = ReadAsBytes(photoStream);
var result = Convert.ToBase64String(photoBytes);

在哪里

//Convert Stream to bytes array  
public static byte[] ReadAsBytes(Stream input)
{
    using (var ms = new MemoryStream())
    {
        input.CopyTo(ms);
        return ms.ToArray();
    }
}