【IT168 应用】准备工作：Windows Azure只能运行在Windows 7, Windows Server 2008 和Windows Vista 上。暂不支持Windows 2003和XP。昨天安装了Win7，打算尝试写一个 Azure小程序，程序很简单，实现图片的简单上传和搜索功能，我顺便研究一下 微软的Azure平台，下面是我的软件环境。
操作系统：Windows 7
开发工具：Visual Studio2010 RC,Windows Azure SDK ,Windows Azure Tools
第一步：安装Windows Azure SDK
首先确定你的操作系统满足要求，Visual Studio可以是Visual Studio2008 或者Visual Studio2010。到下面网址下载Windows Azure SDK :
http://www.microsoft.com/downloads/details.aspx?FamilyID=772990da- 8926-4db0-958f-95c1da572c84&displaylang=en
一旦你安装成功，你的电脑上会多出Windows Azure SDK v1.1 ，如下图：
▲
启动Development Fabric和Development Stroage：
▲
显示配置界面:
▲
Development Fabric：
▲
Development Storage：
▲
以上证明你安装成功。
第二步：安装Windows Azure Tools for Microsoft Visual Studio
地址：http://www.microsoft.com/downloads/details.aspx? FamilyID=5664019e-6860-4c33-9843-4eb40b297ab6&displaylang=en
安装之后，Visual Studio会有如下模版：
▲
第三步：新建一个云服务命名为BlobStorage，如下图：
▲
使用简单的ASP.NET Web Role，并更名为BlobWebRole，如下图：
▲
得到如下结构的项目：
▲
第四步：修改代码，我们实现一个简单的图片上传和搜索的功能：
▲
1、添加一个connectionstring，如下图
▲
2、将WebRole的代码修改成如下所示：
{
public override bool OnStart()
{
DiagnosticMonitor.Start ("BlobConnectionString");
CloudStorageAccount.SetConfigurationSettingPublisher((configName, configSetter) =>
{
configSetter (RoleEnvironment.GetConfigurationSettingValue(configName));
});
// get the blob connection string
CloudStorageAccount objStorage = CloudStorageAccount.FromConfigurationSetting ("BlobConnectionString");
// get the client reference
CloudBlobClient objClient = new CloudBlobClient(objStorage.BlobEndpoint, objStorage.Credentials);
// Get the reference to container
CloudBlobContainer objContainer = objClient.GetContainerReference("mycontainer");
// Create the container if it does not exist
objContainer.CreateIfNotExist();
RoleEnvironment.Changing += RoleEnvironmentChanging;
return base.OnStart();
}
private void RoleEnvironmentChanging(object sender, RoleEnvironmentChangingEventArgs e)
{
// If a configuration setting is changing
if (e.Changes.Any(change => change is RoleEnvironmentConfigurationSettingChange))
{
// Set e.Cancel to true to restart this role instance
e.Cancel = true;
}
}
}
本文来自编程入门网：http://www.bianceng.cn/Servers/cloud-computing/201011/20499_5.htm
3、在页面上拖放几个控件，简单地布局如下：
▲
4、后台代码如下：
{
// Get the storage account reference
CloudStorageAccount objStorage = CloudStorageAccount.FromConfigurationSetting ("BlobConnectionString");
// get the Client reference using storage blobend point
CloudBlobClient objClient = new CloudBlobClient(objStorage.BlobEndpoint, objStorage.Credentials);
// Get Container reference
CloudBlobContainer objContainer = objClient.GetContainerReference("mycontainer");
// Get blob reference
CloudBlob obj = objContainer.GetBlobReference(FileUpload1.FileName.ToString());
// Set meta values
obj.Metadata["MetaName"] = "meta";
// Open a stream using the cloud object
BlobStream blobstream = obj.OpenWrite ();
// Write the stream to the blob database
blobstream.Write(FileUpload1.FileBytes, 0, FileUpload1.FileBytes.Count());
blobstream.Close();
// Browse through blob list from the container
IEnumerable<IListBlobItem> objBlobList = objContainer.ListBlobs();
foreach (IListBlobItem objItem in objBlobList)
{
Response.Write(objItem.Uri + "<br>");
}
}
protected void Button2_Click(object sender, EventArgs e)
{
// Get the storage account reference
CloudStorageAccount objStorage = CloudStorageAccount.FromConfigurationSetting ("BlobConnectionString");
// get the Client reference using storage blobend point
CloudBlobClient objClient = new CloudBlobClient(objStorage.BlobEndpoint, objStorage.Credentials);
// Get Container reference
CloudBlobContainer objContainer = objClient.GetContainerReference("mycontainer");
// Get the blob reference using the blob name provided in the search
CloudBlob obj = objContainer.GetBlobReference(txtSearch.Text);
BlobStream blobstream = obj.OpenRead ();
// Create the image object and display the same on the browser response
System.Drawing.Image objimg = null;
objimg = System.Drawing.Image.FromStream (blobstream, true);
Response.Clear();
Response.ContentType = "image/gif";
objimg.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
}
本文来自编程入门网：http://www.bianceng.cn/Servers/cloud-computing/201011/20499_5.htm
运行效果：
▲
