Question

我正在尝试使用Graph API将文件上传到OneDrive。当我上传小于4MB的文件时，以下代码可以正常工作，但是当我尝试上传大于4 MB的文件时，则显示错误。我经历了this documentation，但仍然不确定如何获得这项工作。

下面是我小于4MB的文件的工作代码。

using (var client = new HttpClient())
{
    var url = "https://graph.microsoft.com/v1.0" + $"/drives/{driveID}/items/{folderId}:/{originalFileName}:/content";
    client.DefaultRequestHeaders.Add("Authorization", "Bearer " + GetAccessToken());

    byte[] sContents = System.IO.File.ReadAllBytes(filePath);
    var content = new ByteArrayContent(sContents);

    var response = client.PutAsync(url, content).Result.Content.ReadAsStringAsync().Result;
}

请帮助

Answer 1

对于大于4MB的文件，您需要create an uploadSession张贴到该URL：

https://graph.microsoft.com/v1.0/me/drive/root:/{item-path}:/createUploadSession

传递项目数组

{
  "item": {
    "@odata.type": "microsoft.graph.driveItemUploadableProperties",
    "@microsoft.graph.conflictBehavior": "rename",
    "name": "largefile.dat"
  }
}

我使用"@microsoft.graph.conflictBehavior": "overwrite"而不是rename。

响应将提供一个上传URL，以批量上传文件

{
  "uploadUrl": "https://sn3302.up.1drv.com/up/fe6987415ace7X4e1eF866337",
  "expirationDateTime": "2015-01-29T09:21:55.523Z"
}

我没有c＃示例，但这是一个PHP示例：

$url = $result['uploadUrl'];
$fragSize = 1024*1024*4;
$file = file_get_contents($source);
$fileSize = strlen($file);
$numFragments = ceil($fileSize / $fragSize);
$bytesRemaining = $fileSize;
$i = 0;
$response = null;

while ($i < $numFragments) {
    $chunkSize = $numBytes = $fragSize;
    $start = $i * $fragSize;
    $end = $i * $fragSize + $chunkSize - 1;
    $offset = $i * $fragSize;

    if ($bytesRemaining < $chunkSize) {
        $chunkSize = $numBytes = $bytesRemaining;
        $end = $fileSize - 1;
    }

    if ($stream = fopen($source, 'r')) {
        // get contents using offset
        $data = stream_get_contents($stream, $chunkSize, $offset);
        fclose($stream);
    }

    $contentRange = " bytes " . $start . "-" . $end . "/" . $fileSize;
    $headers = array(
        "Content-Length: $numBytes",
        "Content-Range: $contentRange"
    );

    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PUT");
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    $server_output = curl_exec($ch);
    $info = curl_getinfo($ch);
    curl_close($ch);

    $bytesRemaining = $bytesRemaining - $chunkSize;
    $i++;
}

Answer 2

我们需要按字节长度（即4MB）拆分字节数组，然后将其传递给OneDrive API。工作版本如下：

using (var client = new HttpClient())
{
    var url = "https://graph.microsoft.com/v1.0" + $"/drives/{driveID}/items/{folderId}:/{originalFileName}:/createUploadSession";
    client.DefaultRequestHeaders.Add("Authorization", "Bearer " + GetAccessToken());

    var sessionResponse = client.PostAsync(apiUrl, null).Result.Content.ReadAsStringAsync().Result;

    byte[] sContents = System.IO.File.ReadAllBytes(filePath);
    var uploadSession = JsonConvert.DeserializeObject<UploadSessionResponse>(sessionResponse);
    string response = UploadFileBySession(uploadSession.uploadUrl, sContents);
}

UploadFileBySession如下：

private string UploadFileBySession(string url, byte[] file)
{
    int fragSize = 1024 * 1024 * 4;
    var arrayBatches = ByteArrayIntoBatches(file, fragSize);
    int start = 0;
    string response = "";

    foreach (var byteArray in arrayBatches)
    {
        int byteArrayLength = byteArray.Length;
        var contentRange = " bytes " + start + "-" + (start + (byteArrayLength - 1)) + "/" + file.Length;

        using (var client = new HttpClient())
        {
            var content = new ByteArrayContent(byteArray);
            content.Headers.Add("Content-Length", byteArrayLength.ToProperString());
            content.Headers.Add("Content-Range", contentRange);

            response = client.PutAsync(url, content).Result.Content.ReadAsStringAsync().Result;
        }

        start = start + byteArrayLength;
    }
    return response;
}

internal IEnumerable<byte[]> ByteArrayIntoBatches(byte[] bArray, int intBufforLengt)
{
    int bArrayLenght = bArray.Length;
    byte[] bReturn = null;

    int i = 0;
    for (; bArrayLenght > (i + 1) * intBufforLengt; i++)
    {
        bReturn = new byte[intBufforLengt];
        Array.Copy(bArray, i * intBufforLengt, bReturn, 0, intBufforLengt);
        yield return bReturn;
    }

    int intBufforLeft = bArrayLenght - i * intBufforLengt;
    if (intBufforLeft > 0)
    {
        bReturn = new byte[intBufforLeft];
        Array.Copy(bArray, i * intBufforLengt, bReturn, 0, intBufforLeft);
        yield return bReturn;
    }
}

UploadSessionResponse类文件可在创建上传会话时反序列化JSON响应

public class UploadSessionResponse
{
    public string odatacontext { get; set; }
    public DateTime expirationDateTime { get; set; }
    public string[] nextExpectedRanges { get; set; }
    public string uploadUrl { get; set; }
}

使用Graph API将文件（> 4MB）上传到OneDrive

2 个答案: