Question

我正在尝试从C＃创建一个分段上传请求，以便根据https://developers.google.com/drive/v3/web/multipart-upload将小文件上传到Google云端硬盘

        using (var client = new HttpClient())
        {
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", access_token);

            //api endpoint
            var apiUri = new Uri("https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart");

            // read the image content 
            var imageBinaryContent = new ByteArrayContent(fileBytes);
            imageBinaryContent.Headers.Add("Content-Type", "image/jpeg");

            // prepare the metadata content
            string metaContent = "{\"name\":\"myObject\"}";
            byte[] byteArray = Encoding.UTF8.GetBytes(metaContent);
            var metaStream = new ByteArrayContent(byteArray);
            metaStream.Headers.Add("Content-Type", "application/json; charset=UTF-8");

            // create the multipartformdata content, set the headers, and add the above content
            var multipartContent = new MultipartFormDataContent();
            multipartContent.Headers.Remove("Content-Type");
            multipartContent.Headers.TryAddWithoutValidation("Content-Type", "multipart/form-data; boundry=myboundry---");
            multipartContent.Add(metaStream);
            multipartContent.Add(imageBinaryContent);


            HttpResponseMessage result = await client.PostAsync(apiUri, multipartContent);

        }

但我似乎无法让它发挥作用。此代码适用于简单上传到云端硬盘：

        using (var client = new HttpClient())
        {
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", access_token);

            //api endpoint
            var apiUri = new Uri("https://www.googleapis.com/upload/drive/v3/files?uploadType=media");


            // read the image content 
            var imageBinaryContent = new ByteArrayContent(fileBytes);
            imageBinaryContent.Headers.Add("Content-Type", "image/jpeg");


            HttpResponseMessage result = await client.PostAsync(apiUri, imageBinaryContent);

        }

Answer 1

有两件事情跳出来：

您在boundary中拼错了boundry=myboundry这个词。
另请确保Content-Type为multipart/related。

Answer 2

对于那些尝试在.net内核中进行尝试的人来说，这是我的代码：

public async Task UploadFile(Stream stream, string filename)
{
    var accessToken = "";

    using var client = _httpClientFactory.CreateClient();
    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);

    var metaContent = JsonContent.Create(new { name = filename });
    var streamContent = new StreamContent(stream);
    var multipart = new MultipartContent { metaContent, streamContent };
    streamContent.Headers.ContentType = new MediaTypeHeaderValue(MediaTypeNames.Application.Octet);
    streamContent.Headers.ContentLength = stream.Length;
    var result = await client.PostAsync("https://www.googleapis.com/upload/drive/v3/files?uploadtype=multipart", multipart);
}

向Google云端硬盘发送C＃分段上传请求

2 个答案: