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。没有发生错误，并且我的图像成功地保存到MemoryStream。不出所料，我的blob是空的。

// 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);
}

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"));

但我会标记“Gaurav Mantri”的回应是正确的。如果不是他的洞察力，我的图像就不会上传到Blob上。

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);
}