如何发送 Microsoft Graph 上传会话的最后字节？

Question

我正在关注 Microsoft 提供的将大文件上传到 Microsoft Graph 的文档。
除了文件最后字节上的字节数组外，一切都很好。

https://docs.microsoft.com/en-us/graph/api/driveitem-createuploadsession?view=graph-rest-1.0

首先，我创建了一个具有文件名的 DriveItem 并上传了一个空字节[]。

using (var emptyFileClient = new HttpClient())
{
   var url = "https://graph.microsoft.com/v1.0/drives/" + driveID + "/root:/" + sharepoint2013ID + "/" + fileInfo.Name + ":/content";
   emptyFileClient.DefaultRequestHeaders.Add("Authorization", bearer);
   var emptyFileContent = new ByteArrayContent(new byte[0]);
                
   var emptyFileResponse = emptyFileClient.PutAsync(url, emptyFileContent).Result;
   if (emptyFileResponse.StatusCode != System.Net.HttpStatusCode.Created)
   {
      return false;
   }
}

然后我确保我有一个有效的 DriveItemID

var client = new RestClient("https://graph.microsoft.com/v1.0/drives/" + driveID + "/root:/" + sharepoint2013ID + "/" + fileInfo.Name);
var request = new RestRequest(Method.GET);
request.AddHeader("Authorization", bearer);
IRestResponse response = client.Execute(request);
if (response.StatusCode != System.Net.HttpStatusCode.OK)
{
    return null;
}

接下来我创建一个 UploadSession

//Create UploadSession
var client = new RestClient("https://graph.microsoft.com/v1.0/drives/" + driveID + "/items/" + driveItem.id + "/createUploadSession");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", bearer);
IRestResponse response = client.Execute(request);
if (response.StatusCode != System.Net.HttpStatusCode.OK)
{
   throw new Exception("Could Not Create Upload Session");
}

这一切正常，所以现在我开始上传文件。同样，一切正常，直到最后一个字节 [].

我已验证最终字节 [] 的预期范围与我发送的字节数组匹配。

WebRequest request = null;
using (Stream source = File.OpenRead(fileInfo.FullName))
{
    double fileSizeBytes = fileInfo.Length;
    int bufferSize = 2048000;
    byte[] buffer = new byte[bufferSize];
    int bytesRead;
    var loopCount = 0;
    while ((bytesRead = source.Read(buffer, 0, buffer.Length)) > 0)
    {
        double startByte = bufferSize * loopCount;
        double endByte = startByte + bytesRead - 1;
        var contentRange = "bytes " + startByte + "-" + endByte + "/" + fileSizeBytes;
        Console.WriteLine(contentRange);

        request = WebRequest.Create(uploadSession.uploadUrl);
        request.Headers.Add("Authorization", bearer);
        request.Headers.Add("Content-Length", bytesRead.ToString());
        request.Headers.Add("Content-Range", contentRange);
        request.Method = "PUT";
        request.ContentLength = buffer.Length;
        Stream dataStream = request.GetRequestStream();
        dataStream.Write(buffer, 0, buffer.Length);
        dataStream.Close();
                    
        var response = (HttpWebResponse)request.GetResponse();
        if (response.StatusCode != System.Net.HttpStatusCode.Accepted)
        {
            return false;
        }
        loopCount++;
    }
}

我一直在测试超过缓冲区大小的大文件，以便将上传分成多个请求。如果减小缓冲区大小，您还可以使用较小的文件进行测试。如有任何帮助，我们将不胜感激。

此外，我对使用 Graph.SDK 或任何其他库不感兴趣，这需要来自网络请求的运行。这是用于 Sharepoint2013 Server 将在 SharepointOnline 中保存一些文件的混合解决方案。

Answer 1

问题原来是我设置了 content-length header 两次，其中一次使用了不正确的值。只需注释掉以下行，上面的所有内容都会正常工作。

//request.ContentLength = buffer.Length;

在最终上传时，长度不是缓冲区的完整长度，而是需要设置为 bytesRead。

如何发送 Microsoft Graph 上传会话的最后字节？

How do I send the final bytes for a Microsoft Graph Upload Session?

c#

azure

file-upload

microsoft-graph-api