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The basics of BLOBs
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containers). You should place the code in the following listing before the code in listing 8.1 in the containers.aspx page.
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Listing 8.3 Listing BLOBs with a GridView Autogenerates columns in <asp:GridView ID="gvContainers" runat="server" grid from bound object AutoGenerateColumns="true" onrowcommand="gvContainers_RowCommand" onrowdeleting="gvContainers_RowDeleting"> Deletes <Columns> container <asp:TemplateField> <ItemTemplate> <asp:LinkButton ID="btnDelete" runat="server" Text="Delete" CommandName="Delete" CommandArgument='<%#Eval("Name")%>'/> </ItemTemplate> </asp:TemplateField> Hyperlink for page <asp:HyperLinkField Text="View" listing BLOBs DataNavigateUrlFields="Name" DataNavigateUrlFormatString="Blobs.aspx Container={0}" /> </Columns> </asp:GridView>
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The code in listing 8.3 is the ASP.NET markup for figure 8.11. Notice that you re allowing the grid to autogenerate all the columns (except the Delete button and the View hyperlink) based on the properties of the object bound to the grid. Listing 8.4 shows the code-behind for your web page that gets a list of containers from the account and binds it to the grid.
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Listing 8.4 Binding the grid
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protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { CloudStorageAccount.SetConfigurationSettingPublisher( (configName, configSetter) => { configSetter(RoleEnvironment .GetConfigurationSettingValue(configName)); }); BindGrid(); } } private void BindGrid() { CloudStorageAccount account = CloudStorageAccount.FromConfigurationSetting("DataConnectionString"); CloudBlobClient blobClient = account.CreateCloudBlobClient();
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Developing against containers
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gvContainers.DataSource = blobClient.ListContainers(); gvContainers.DataBind(); }
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177 Sets grid data source as list of containers in account
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Binds data grid to its data source
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One interesting thing you ll see in the Page_Load method is a call to SetConfigurationSettingPublisher. We wouldn t normally put this code here, but it was the easiest place to put it in the book. When you load configuration in ASP.NET, it looks in the web.config file by default. If you re storing your configuration in the .csdef file, ASP.NET will never find it. By including this line of code, you re telling ASP.NET to look in the .cscfg file for the configuration you re trying to load. We would normally put this in the Role_OnStart event, or somewhere else where it ll be run once per role instance as it starts up. Now you have a web page that will display all the containers in your storage account. The page also allows you to create new private containers. To complete your sample, you just need to implement the delete functionality.
Deleting a container
You want to be able to click the Delete button on a particular row in your web page to delete the underlying container. For this to happen, you need to hook in your Delete button. The following listing shows the code-behind for implementing the delete functionality.
Listing 8.5 Deleting the container
protected void gvContainers_RowCommand (object sender, GridViewCommandEventArgs e) { if (e.CommandName == "Delete") { DeleteContainer(e.CommandArgument.ToString()); Calls DeleteContainer } method on receiving BindGrid(); } private void DeleteContainer(string containerName) { CloudStorageAccount account = CloudStorageAccount.FromConfigurationSetting ("DataConnectionString"); CloudBlobClient blobClient = account.CreateCloudBlobClient(); CloudBlobContainer container = blobClient.GetContainerReference(containerName); container.Delete(); }
Delete command
Gets container from BLOB account
Deletes container
The basics of BLOBs
protected void gvContainers_RowDeleting(object sender, GridViewDeleteEventArgs e) Empties RowDeleting { handler to avoid }
exceptions
With the Delete button code hooked in, you should be able to run your application and view all the BLOB containers in development storage, add a container, and then delete it from your web page. Wow, you ve done a great job. You ve just completed your first Windows Azure BLOB storage application. All that s left is to make this baby work against the live BLOB storage service.
Configuring your application to work against the live service
To switch your application from the development storage to the live storage account, you need to create a live storage account and switch your configuration to it. In this section, we won t go through the process of creating a storage account; it s pretty simple and the information you require is available in this chapter. We re going to focus on configuring your application to work against your live storage account.
Always set affinity for your storage account
During the process of creating your storage account, always set affinity, as described in chapter 2 when we discussed the Azure portal. If you don t set affinity, it s possible that your web role might be hosted in Washington State, but your storage account is hosted in Chicago. The latency caused by cross-data-center communication will harm the performance of your application. To gain maximum performance, always set affinity on your web roles, worker roles, and storage accounts to the same data center; this ensures that you achieve the best possible network latency.
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