将 blob 和容器列表到 Listbox C#

Question

我已经使用 WCF 创建了一个 Azure 云服务，我试图在其中列出我的容器和 blob。我已经能够列出我的容器和 blob。我想要做的是，当我在我的 ListBox 中选择一个容器时，它将显示它包含在另一个 ListBox 中的 blob。

这是列出我的容器的代码：

    public List<string> ListContainer()
    {
        List<string> blobs = new List<string>();

        // Retrieve storage account from connection string.
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
            CloudConfigurationManager.GetSetting("BlobConnectionString"));

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

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

        //Get the list of the blob from the above container

        IEnumerable<CloudBlobContainer> containers = blobClient.ListContainers();

        foreach (CloudBlobContainer item in containers)
        {

            blobs.Add(string.Format("{0}", item.Uri));
        }

            return blobs;
    }

列出我的 blob 的代码：

        public List<string> ListBlob(string folder)
    {
        List<string> blobs = new List<string>();

        // Retrieve storage account from connection string.
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
            CloudConfigurationManager.GetSetting("BlobConnectionString"));

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

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


        //Get the list of the blob from the above container
        IEnumerable<IListBlobItem> blobList = container.ListBlobs();

        //Display the names on the page
        string names = string.Empty;

        foreach (IListBlobItem item in blobList)
        {
            blobs.Add(string.Format("Directory {0}", item.Uri));
        }

在我的 web 表单中，我在页面加载中调用我的 ListContainer 方法：

 protected void Page_Load(object sender, EventArgs e)
    {
        BlobService list = new BlobService();
        ListBox2.DataSource = list.ListContainer();
        ListBox2.DataBind();

    }

当我加载项目时，我的容器列在 ListBox 2 中。我需要的是，当我单击一个容器时，它将显示它包含在另一个 ListBox 中的 blob。我尝试了以下但没有任何反应：

protected void ListBox2_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (ListBox2.SelectedItem.Equals("http://127.0.0.1:10000/devstorageaccount1/mycontainer"))
        {
            BlobService list = new BlobService();
            ListBox1.DataSource = list.ListBlob("mycontainer");
            ListBox1.DataBind();
        }

        else
        {
            //Error Message
        }

Answer 1

如果索引已更改，将在回发到服务器期间调用事件处理程序ListBox2_SelectedIndexChanged。为了在用户选择新项目时开始回发，您需要在 aspx-markup 中的ListBox2 上设置AutoPostBack="True"（详见link）：

<asp:ListBox ID="ListBox2" runat="server" AutoPostBack="True" 
    OnSelectedIndexChanged="ListBox2_SelectedIndexChanged" />

Answer 2

您可能还需要添加 DataTextField 以指定显示的内容，并添加 DataValueField 以指定您要使用的键。

Answer 3

我看不到你的 ListBlob(string folder) 方法完整代码，它有一个方法来获取本文中的 blob https://azure.microsoft.com/en-us/documentation/articles/storage-dotnet-how-to-use-blobs/ 您可以更改 ListBlob(string folder) 方法以获得结果：

public List<string> ListBlob(string folder)
        {
            List<string> blobs = new List<string>();

            // Retrieve storage account from connection string.
            CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
                CloudConfigurationManager.GetSetting("BlobConnectionString"));

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

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

            // Loop over items within the container and output the length and URI.
            foreach (IListBlobItem item in container.ListBlobs(null, false))
            {
                if (item.GetType() == typeof(CloudBlockBlob))
                {
                    CloudBlockBlob blob = (CloudBlockBlob)item;

                    blobs.Add(string.Format("Block blob of length {0}: {1}", blob.Properties.Length, blob.Uri));

                }
                else if (item.GetType() == typeof(CloudPageBlob))
                {
                    CloudPageBlob pageBlob = (CloudPageBlob)item;

                    blobs.Add(string.Format("Page blob of length {0}: {1}", pageBlob.Properties.Length, pageBlob.Uri));

                }
                else if (item.GetType() == typeof(CloudBlobDirectory))
                {
                    CloudBlobDirectory directory = (CloudBlobDirectory)item;

                    blobs.Add(string.Format("Directory: {0}", directory.Uri)); ;
                }
            }
            return blobs;
        }


protected void ListBox2_SelectedIndexChanged(object sender, EventArgs e)
        {           
                BlobService list = new BlobService();
                ListBox1.DataSource = list.ListBlob("mycontainer");
                ListBox1.DataBind();

        }

如果您有任何问题，请保持联系。