c# code 128 font Show the list of BLOBs in the grid in Visual C#

Creating ANSI/AIM Code 128 in Visual C# Show the list of BLOBs in the grid

Listing 9.4 Show the list of BLOBs in the grid
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protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) BindGrid(); } private void BindGrid() { CloudStorageAccount account = CloudStorageAccount.FromConfigurationSetting("DataConnectionString"); CloudBlobClient blobClient = account.CreateCloudBlobClient();
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CloudBlobContainer container = blobClient.GetContainerReference(Request["container"] as string); gvBlobs.DataSource = container.ListBlobs(); gvBlobs.DataBind();
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Gets container from request query string
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Lists BLOBs in container
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The code shown in listing 9.4 is again similar to the list containers example in chapter 8. This code is the storage client equivalent to the code you used to display the list of BLOBs with the REST API directly in listing 9.1. At q you retrieve an instance of the BLOB container by calling the GetContainerReference method off the BLOB client. Notice that we re passing in the container name from the request query string. Finally, you retrieve a list of the files held in the container by calling the ListBlobs method and binding the result to the GridView w. Now that you can list and display all of the BLOBs in the selected container, you need to extend the web page so that you can upload new files into the container.
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Managing BLOBs using the StorageClient library
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Uploading BLOBs
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To upload files from your web page, you re going to use the built-in ASP.NET upload control at e in listing 9.3. On click of the upload button at r, you re going to capture the uploaded file and then upload the captured file to BLOB storage. The following listing contains the code-behind for the upload button click event.
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Listing 9.5 Posting the uploaded file to BLOB storage
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protected void btnUpload_Click(object sender, EventArgs e) { CloudStorageAccount account = CloudStorageAccount.FromConfigurationSetting("DataConnectionString"); CloudBlobClient blobClient = account.CreateCloudBlobClient(); CloudBlobContainer container = blobClient.GetContainerReference(Request["container"] as string); var blob = container.GetBlobReference(fu.PostedFile.FileName); blob.UploadByteArray(fu.FileBytes); BindGrid(); }
Uploads file contents to BLOB
Gets reference to new BLOB
All the code in listing 9.5 has been discussed in previous examples, except for what s happening at q and w. At q you get a reference to the BLOB that you re about to create. We re giving the BLOB the original name of the uploaded file (retrieved from the UploadFile control). Then, at w you upload the new file to BLOB storage. You ll notice that we re extracting the filename and the file contents directly from the ASP.NET file upload control. If you want, you can give the file a name different from the original.
Setting the maximum request length
By default, ASP.NET is configured to allow a maximum upload of 4 MB. If you provide a web role frontend to the BLOB storage as we ve done in this sample, you might need to increase the maximum request length. To increase the default value to a larger value, you need to add the following line under the system.web element in the web.config file: <httpRuntime executionTimeout="300" maxRequestLength="51200"/> The maximum upload size in the above example is 50 MB.
In the previous example, we used the UploadByteArray method to upload the BLOB. Three other methods are provided in the StorageClient library that you can use:
Uploading and downloading BLOBs
UploadFile, UploadText, and UploadFromStream. Depending on your situation, one of these methods might be easier to use than UploadByteArray (for example, UploadFile might be a better choice if you have a local file on disk that you want to store in
BLOB storage).
Splitting BLOBs into blocks
The maximum size of a BLOB is 1 TB, but if a file is larger than 64 MB, under the covers the StorageClient library splits the file into smaller blocks of 4 MB each. One of the advantages of the StorageClient library is that you don t need to worry about this. If you re using the REST API, you ll need to implement the splitting of BLOBs into blocks and the committal of blocks and retry logic associated with re-uploading failed blocks (yet another good reason to use the StorageClient library). If you re a sick and twisted individual who wants to mess around with blocks, then feel free to look in more detail at the online documentation at http://msdn.microsoft. com/en-us/library/ee691964.aspx.
Now that you ve spent all that time and effort adding the file to BLOB storage, let s delete it (groan).
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