ตอนที่ 11 : How to use .Net (Asp.net) Delete Entity in Table Storage - ลบข้อมูลในตาราง

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

using Microsoft.WindowsAzure.Storage.Table;

namespace myWebApp
{
    public class CustomerEntity : TableEntity
    {

        public CustomerEntity(string pKey, string rKey)
        {
            this.PartitionKey = pKey;
            this.RowKey = rKey;
        }

        public CustomerEntity() { }

        public string CustomerID { get; set; }

        public string Name { get; set; }

        public string Email { get; set; }

        public string CountryCode { get; set; }

        public string Budget { get; set; }

        public string Used { get; set; }

    }
}

            // Create the CloudTable object that represents the "customer" table.
            CloudTable table = tableClient.GetTableReference("customer");

            // Create a retrieve operation that expects a customer entity.
            TableOperation retrieveOperation = TableOperation.Retrieve<CustomerEntity>("myCustomer", myGridView.DataKeys[e.RowIndex].Value.ToString());

            // Execute the operation.
            TableResult retrievedResult = table.Execute(retrieveOperation);

            // Assign the result to a CustomerEntity.
            CustomerEntity deleteEntity = (CustomerEntity)retrievedResult.Result;

            // Create the Delete TableOperation.
            if (deleteEntity != null)
            {
                TableOperation deleteOperation = TableOperation.Delete(deleteEntity);

                // Execute the operation.
                table.Execute(deleteOperation);
            }

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.Table;

namespace myWebApp
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                BindData();
            }
        }

        protected void BindData()
        {

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

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

            // Create the table client.
            CloudTableClient tableClient = storageAccount.CreateCloudTableClient();

            // Create the CloudTable object that represents the "customer" table.
            CloudTable table = tableClient.GetTableReference("customer");


            // Construct the query operation for all customer entities where PartitionKey="Smith".
            TableQuery<CustomerEntity> query = new TableQuery<CustomerEntity>().Where(TableQuery.GenerateFilterCondition("PartitionKey", QueryComparisons.Equal, "myCustomer"));

            // Create List Customer
            List<CustomerEntity> ls = new List<CustomerEntity>();

            // Print the fields for each customer.
            foreach (CustomerEntity entity in table.ExecuteQuery(query))
            {
                // Create a new customer entity.
                CustomerEntity cus = new CustomerEntity(entity.PartitionKey, entity.RowKey);
                cus.CustomerID = entity.CustomerID;
                cus.Name = entity.Name;
                cus.Email = entity.Email;
                cus.CountryCode = entity.CountryCode;
                cus.Budget = entity.Budget;
                cus.Used = entity.Used;
                ls.Add(cus);
            }

            // Bind Data to GridView
            this.myGridView.DataSource = ls;
            this.myGridView.DataBind();
        }

        protected void modDeleteCommand(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 table client.
            CloudTableClient tableClient = storageAccount.CreateCloudTableClient();

            // Create the CloudTable object that represents the "customer" table.
            CloudTable table = tableClient.GetTableReference("customer");

            // Create a retrieve operation that expects a customer entity.
            TableOperation retrieveOperation = TableOperation.Retrieve<CustomerEntity>("myCustomer", myGridView.DataKeys[e.RowIndex].Value.ToString());

            // Execute the operation.
            TableResult retrievedResult = table.Execute(retrieveOperation);

            // Assign the result to a CustomerEntity.
            CustomerEntity deleteEntity = (CustomerEntity)retrievedResult.Result;

            // Create the Delete TableOperation.
            if (deleteEntity != null)
            {
                TableOperation deleteOperation = TableOperation.Delete(deleteEntity);

                // Execute the operation.
                table.Execute(deleteOperation);
            }

            myGridView.EditIndex = -1;
            BindData();
        }

    }
}

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" 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" 
	        ShowFooter="True" 
	        DataKeyNames="CustomerID"
            ShowHeaderWhenEmpty ="true"
            OnRowDeleting="modDeleteCommand">

	        <Columns>

	        <asp:TemplateField HeaderText="CustomerID">
		        <ItemTemplate>
			        <asp:Label id="lblCustomerID" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.CustomerID") %>'></asp:Label>
		        </ItemTemplate>
		        <EditItemTemplate>
			        <asp:TextBox id="txtEditCustomerID" size="5" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.CustomerID") %>'></asp:TextBox>
		        </EditItemTemplate>
		        <FooterTemplate>
			        <asp:TextBox id="txtAddCustomerID" size="5" runat="server"></asp:TextBox>
		        </FooterTemplate>
	        </asp:TemplateField>

	        <asp:TemplateField HeaderText="Name">
		        <ItemTemplate>
			        <asp:Label id="lblName" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Name") %>'></asp:Label>
		        </ItemTemplate>
		        <EditItemTemplate>
			        <asp:TextBox id="txtEditName" size="10" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Name") %>'></asp:TextBox>
		        </EditItemTemplate>
		        <FooterTemplate>
			        <asp:TextBox id="txtAddName" size="10" runat="server"></asp:TextBox>
		        </FooterTemplate>
	        </asp:TemplateField>

	        <asp:TemplateField HeaderText="Email">
		        <ItemTemplate>
			        <asp:Label id="lblEmail" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Email") %>'></asp:Label>
		        </ItemTemplate>
		        <EditItemTemplate>
			        <asp:TextBox id="txtEditEmail" size="20" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Email") %>'></asp:TextBox>
		        </EditItemTemplate>
		        <FooterTemplate>
			        <asp:TextBox id="txtAddEmail" size="20" runat="server"></asp:TextBox>
		        </FooterTemplate>
	        </asp:TemplateField>

	        <asp:TemplateField HeaderText="CountryCode">
		        <ItemTemplate>
			        <asp:Label id="lblCountryCode" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.CountryCode") %>'></asp:Label>
		        </ItemTemplate>
		        <EditItemTemplate>
			        <asp:TextBox id="txtEditCountryCode" size="2" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.CountryCode") %>'></asp:TextBox>
		        </EditItemTemplate>
		        <FooterTemplate>
			        <asp:TextBox id="txtAddCountryCode" size="2" runat="server"></asp:TextBox>
		        </FooterTemplate>
	        </asp:TemplateField>

	        <asp:TemplateField HeaderText="Budget">
		        <ItemTemplate>
			        <asp:Label id="lblBudget" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Budget") %>'></asp:Label>
		        </ItemTemplate>
		        <EditItemTemplate>
			        <asp:TextBox id="txtEditBudget" size="6" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Budget") %>'></asp:TextBox>
		        </EditItemTemplate>
		        <FooterTemplate>
			        <asp:TextBox id="txtAddBudget" size="6" runat="server"></asp:TextBox>
		        </FooterTemplate>
	        </asp:TemplateField>

	        <asp:TemplateField HeaderText="Used">
		        <ItemTemplate>
			        <asp:Label id="lblUsed" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Used") %>'></asp:Label>
		        </ItemTemplate>
		        <EditItemTemplate>
			        <asp:TextBox id="txtEditUsed" size="6" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Used") %>'></asp:TextBox>
		        </EditItemTemplate>
		        <FooterTemplate>
			        <asp:TextBox id="txtAddUsed" size="6" runat="server"></asp:TextBox>
			        <asp:Button id="btnAdd" runat="server" Text="Add" CommandName="Add"></asp:Button>
		        </FooterTemplate>
	        </asp:TemplateField>

	        <asp:CommandField ShowEditButton="True" CancelText="Cancel" DeleteText="Delete" EditText="Edit" UpdateText="Update" HeaderText="Modify"  />
	        <asp:CommandField ShowDeleteButton="True" HeaderText="Delete" />
	
	        </Columns>
        </asp:GridView>
    </div>
    </form>
</body>
</html>