ตอนที่ 6 : How to use .Net (Asp.net) Delete Blob การลบรายการไฟล์บน Blob

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

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

// Retrieve reference to a blob named "myblob.txt".
CloudBlockBlob blockBlob = container.GetBlockBlobReference("myblob.txt");

// Delete the blob.
blockBlob.Delete();

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Auth;
using Microsoft.WindowsAzure.Storage.Blob;

using System.IO;

namespace myWebApp
{
    public partial class Default : System.Web.UI.Page
    {

        public class Member
        {
            public string URL { set; get; }
            public string Name { set; get; }
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                BinData();
            }
        }

        protected void BinData()
        {

            // Create the connectionstring
            String StorageConnectionString = "DefaultEndpointsProtocol=https;AccountName=[yourAccount];AccountKey=[yourKey]";

            // Retrieve storage account from connection string.
            CloudStorageAccount storageAccount = CloudStorageAccount.Parse(StorageConnectionString);

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

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

            // Create List
            List<Member> ls = new List<Member>();
            // 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;

                    ls.Add(new Member { URL = blob.Uri.ToString(), Name = blob.Name });

                }
            }

            // Create data to GridView
            this.myGridView.DataSource = ls;
            this.myGridView.DataBind();

        }

        protected void myGridView_RowDataBound(object sender, GridViewRowEventArgs e)
        {

            if (e.Row.RowType == DataControlRowType.DataRow)
            {

                //*** Name ***//
                Label lblName = (Label)(e.Row.FindControl("lblName"));
                if (lblName != null)
                {
                    lblName.Text = DataBinder.Eval(e.Row.DataItem, "NAME").ToString();
                }

                //*** View ***//
                Image imgView = (Image)(e.Row.FindControl("imgView"));
                if (imgView != null)
                {
                    imgView.ImageUrl = DataBinder.Eval(e.Row.DataItem, "URL").ToString();
                }

                //*** Delete ***//
                Button btnDelete = (Button)(e.Row.FindControl("btnDelete"));
                if (btnDelete != null)
                {
                    btnDelete.Attributes.Add("OnClick", "return confirm('Delete ?');");
                }

            }

        }

        protected void myGridView_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {

            // Create the connectionstring
            String StorageConnectionString = "DefaultEndpointsProtocol=https;AccountName=[yourAccount];AccountKey=[yourKey]";

            // Retrieve storage account from connection string.
            CloudStorageAccount storageAccount = CloudStorageAccount.Parse(StorageConnectionString);

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

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

            //*** Name (Delete by Blob Name) ***//
            Label lblName = (Label)myGridView.Rows[e.RowIndex].FindControl("lblName");

            // Retrieve reference to a blob.
            CloudBlockBlob blockBlob = container.GetBlockBlobReference(lblName.Text);

            // Delete the blob.
            blockBlob.Delete();

            BinData();
        }

    }
}

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" enableEventValidation="false" Inherits="myWebApp.Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>ThaiCreate.Com Azure Storage Tutorial</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:GridView ID="myGridView" runat="server" 
            AutoGenerateColumns="False" 
            OnRowDataBound="myGridView_RowDataBound" Width="400px" 
            OnRowDeleting="myGridView_RowDeleting">
            <Columns>
                <asp:TemplateField HeaderText="Name">
                    <ItemTemplate>
                        <asp:Label ID="lblName" runat="server"></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="View">
                    <ItemTemplate>
                        <asp:Image ID="imgView" runat="server" />
                    </ItemTemplate>
                    <ItemStyle HorizontalAlign="Center" />
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Delete">
                    <ItemTemplate>
                        <asp:Button ID="btnDelete" runat="server" CommandName="Delete" Text="Delete" />
                    </ItemTemplate>
                    <ItemStyle HorizontalAlign="Center" Width="100px" />
                </asp:TemplateField>
            </Columns>
        </asp:GridView>
    
    </div>
    </form>
</body>
</html>