将MemoryStream文件存储到Azure Blob

Question

我有一个通过System.Drawing动态生成的图像。然后我将生成的图像输出到MemoryStream以存储到我的Azure blob中。

但我似乎无法将我的文件存储在我选择的blob中。没有错误发生，我的图片已成功保存到MemoryStream。正如所料，我的blob是空的。

我确保我的blob容器具有公共读/写访问权限。

代码

// Retrieve storage account from connection string.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(String.Format("DefaultEndpointsProtocol=https;AccountName={0};AccountKey={1}", Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.GetConfigurationSettingValue("CMSAzureAccountName").ToString(), Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.GetConfigurationSettingValue("CMSAzureSharedKey").ToString()));

// Create the blob client.
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

// Retrieve reference to a previously created container.
CloudBlobContainer container = blobClient.GetContainerReference("myimagecontainer");

// Retrieve reference to a blob named "myblob".
CloudBlockBlob blockBlob = container.GetBlockBlobReference("test.jpg");

//Output image
ImageCodecInfo[] Info = System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();
EncoderParameters Params = new System.Drawing.Imaging.EncoderParameters(1);
Params.Param[0] = new EncoderParameter(Encoder.Quality, 100L);

System.IO.MemoryStream msImage = new System.IO.MemoryStream();
GenerateImage.Render(imageOutput).Save(msImage, Info[1], Params); //GenerateImage.Render() method creates a custom image and returns a Bitmap

// Create or overwrite the "myblob" blob with contents from a local file.
using (var fileStream = msImage)
{
    blockBlob.UploadFromStream(fileStream);
}

任何帮助都将不胜感激。

更新

我设法找到错误的主要原因。我需要更改以下内容：

CloudStorageAccount storageAccount = CloudStorageAccount.Parse(String.Format("DefaultEndpointsProtocol=https;AccountName={0};AccountKey={1}", Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.GetConfigurationSettingValue("CMSAzureAccountName").ToString(), Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.GetConfigurationSettingValue("CMSAzureSharedKey").ToString()));

到

CloudStorageAccount storageAccount = CloudStorageAccount.Parse(RoleEnvironment.GetConfigurationSettingValue("DiagnosticsConnectionString"));

但我会将“Gaurav Mantri”的回应标记为正确。如果不是他的见解，我的图像就不会上传到blob。

Answer 1

尝试将内存流的位置设置为0，看看是否有帮助。类似下面的代码：

msImage.Position = 0;//Move the pointer to the start of stream.

// Create or overwrite the "myblob" blob with contents from a local file.
using (var fileStream = msImage)
{
    blockBlob.UploadFromStream(fileStream);
}

Answer 2

我遇到了同样的问题，代码可以工作，但是pdf文件的大小始终为0，我必须使MyMemoryStream.Position = 0;以下是我使用的代码。希望对别人有帮助。

using (pdfStream)
{
    pdfStream.Position = 0;
    blob.UploadFromStream(pdfStream);                            
    _model.ConvertedPdfUrl = blob.Uri.AbsoluteUri;
}