subscriptions.aspx.cs

wrox c#高级编程

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using Wrox.WebModules.Accounts.Business;

namespace Wrox.WebModules.MailingLists.Web
{
	/// <summary>
	/// Summary description for Subscriptions.
	/// </summary>
	public class Subscriptions : Wrox.ThePhile.Web.PhilePage
	{
		protected System.Web.UI.WebControls.DropDownList ListsDropDown;
		protected System.Web.UI.WebControls.TextBox EditEmail;
		protected System.Web.UI.WebControls.TextBox EditLastName;
		protected System.Web.UI.WebControls.TextBox EditFirstName;
		protected System.Web.UI.WebControls.CheckBox EditActive;
		protected System.Web.UI.WebControls.DataGrid SubscrGrid;
		protected System.Web.UI.WebControls.Table TableLists;
		protected System.Web.UI.WebControls.Button SendEmail;

		protected System.Web.UI.WebControls.LinkButton AddNew;
		protected System.Web.UI.WebControls.LinkButton CancelAddNew;
		protected System.Web.UI.WebControls.HyperLink AddCancel;
		protected System.Web.UI.WebControls.Table TableNewSubscriber;
		protected System.Web.UI.WebControls.TextBox NewFirstName;
		protected System.Web.UI.WebControls.TextBox NewLastName;
		protected System.Web.UI.WebControls.TextBox NewEmail;
		protected System.Web.UI.WebControls.CheckBox NewActive;
		protected System.Web.UI.WebControls.Label NewDate;
		protected System.Web.UI.WebControls.RequiredFieldValidator ValidateNewEmail;
		protected System.Web.UI.WebControls.Button Create;
		protected System.Web.UI.WebControls.TableRow AddNewControlsRow;
		protected System.Web.UI.WebControls.TableRow CreateNewRow;
		protected System.Web.UI.WebControls.TableCell AddNewResultCell;
		protected System.Web.UI.WebControls.Label AddNewError;
		protected System.Web.UI.WebControls.Label NumSubscriptions;
		protected System.Web.UI.WebControls.RadioButton ShowAll;
		protected System.Web.UI.WebControls.RadioButton ShowActive;
		protected System.Web.UI.WebControls.RadioButton ShowInactive;


		protected void Page_Load(object sender, EventArgs e)
		{
			// check if the current user is allowed to administer lists/subscriptions
			if (!Context.User.Identity.IsAuthenticated || 
				!((PhilePrincipal)Context.User).HasPermission((int)MailingListsPermissions.AdministerData))
			{
				// if not, redirect to the Login page
				Response.Redirect("/ThePhile/Modules/Users/Login.aspx?ShowError=true", true);
			}
			
			// get the ListID from QueryString
			string listID = Request.Params["ListID"];
			SubscrGrid.Attributes["ListID"] = listID;
			
			if (!Page.IsPostBack)
			{
				// load all the avaible lists in the DropDown control
				ListsDropDown.DataSource = Business.List.GetLists().Tables[0].DefaultView;
				ListsDropDown.DataBind();

				if (listID!=null)
				{
					// select the DropDown element according to the ListID
					ListsDropDown.SelectedIndex = ListsDropDown.Items.IndexOf(
						ListsDropDown.Items.FindByValue(listID));
				}
				
				// (re)bind the page's controls
				BindGrid();
			}
		}

		protected void BindGrid() 
		{
			int listID;

			// get the ListID value from the Grid's attributes
			if ( SubscrGrid.Attributes["ListID"] != null )
				listID = int.Parse(SubscrGrid.Attributes["ListID"]);
			else
				listID = int.Parse(ListsDropDown.SelectedItem.Value);

			// get all the subscribers of this list
			Business.List list = new Business.List(listID);
			DataTable myDT = list.GetSubscriptions().Tables[0];
			DataView myDV = myDT.DefaultView;
			DataView myDVActive = myDT.DefaultView;

			// sort the records according to the SortExpression value in the Grid's attributes
			if ( SubscrGrid.Attributes["SortExpression"]!="" )
				myDV.Sort = SubscrGrid.Attributes["SortExpression"];
			
			// show only the active/inactive subscriptions, if specified in the options
			if (ShowActive.Checked)
				myDV.RowFilter = "Active = 1";
			else if (ShowInactive.Checked)
				myDV.RowFilter = "Active = 0";

			SubscrGrid.DataSource = myDV;
			SubscrGrid.DataBind();
			
			// keep the active subscriptions only
			myDVActive.RowFilter = "Active = 1";
			// write the number of total subscriptions, and the number of active subscriptions
			NumSubscriptions.Text = String.Format("<small>{0} subscriptions in total, {1} active</small>",
				myDT.Rows.Count, myDVActive.Count);										
		}

		protected void ListsDropDown_IndexChanged(object sender, EventArgs e)
		{
			// reload the page to show the records for the selected list
			// This will also hide the controls to add a new subscriber if they were visible
			Response.Redirect("Subscriptions.aspx?ListID=" + ListsDropDown.SelectedItem.Value);
		}
		
		protected void ShowSubscriptions_CheckedChanged(object sender, EventArgs e)
		{
			// filter the subscriptions for the grid
			BindGrid();
		}

		protected void SendEmail_Click(object sender, EventArgs e)
		{
			// redirect to the page to send an Email, adding the ListId value to the QueryString
			Response.Redirect("SendNewsletter.aspx?ListID=" + SubscrGrid.Attributes["ListID"]);
		}

		protected void SubscrGrid_PageChanged(Object sender, DataGridPageChangedEventArgs e)
		{
			// the DataGrid page is changed, so hide the controls for adding a new record
			// if they were visible
			AddNewError.Visible = false;
			ShowAddNewControls(false);
			// change the current page
			SubscrGrid.CurrentPageIndex = e.NewPageIndex;
			BindGrid();
		}
		
		protected void SubscrGrid_Sort(Object sender, DataGridSortCommandEventArgs e) 
		{
			AddNewError.Visible = false;
			ShowAddNewControls(false);
			SubscrGrid.EditItemIndex = -1;
			// set the SortExpression attribute that will be used to actually sort
			// the data in the BindGrid method
			SubscrGrid.Attributes["SortExpression"] = e.SortExpression.ToString();
			BindGrid();
		}

		protected void SubscrGrid_Edit(object sender, DataGridCommandEventArgs e)
		{
			AddNewError.Visible = false;
			ShowAddNewControls(false);
			// start the editing for this item
			SubscrGrid.EditItemIndex = (int)e.Item.ItemIndex;
			BindGrid();
		}

		protected void SubscrGrid_CancelEdit(object sender, DataGridCommandEventArgs e)
		{
			SubscrGrid.EditItemIndex = -1;
			BindGrid();
		}

		protected void SubscrGrid_Update(object sender, DataGridCommandEventArgs e)
		{
			if (Page.IsValid)
			{
				// get the new values for the textboxes
				string firstName = ((TextBox)e.Item.FindControl("EditFirstName")).Text;
				string lastName = ((TextBox)e.Item.FindControl("EditLastName")).Text;
				string email = ((TextBox)e.Item.FindControl("EditEmail")).Text;
				bool active = ((CheckBox)e.Item.FindControl("EditActive")).Checked;
				int subscrID = (int)SubscrGrid.DataKeys[e.Item.ItemIndex];
				
				// update the subscriber's data
				Business.Subscription subscription = new Business.Subscription(subscrID);
				subscription.FirstName = firstName;
				subscription.LastName = lastName;
				subscription.Email = email;
				subscription.Active = active;
				subscription.Update();
				
				SubscrGrid.EditItemIndex = -1;	
				BindGrid();
			}
		}

		protected void SubscrGrid_Delete(object sender, DataGridCommandEventArgs e)
		{
			AddNewError.Visible = false;
			ShowAddNewControls(false);
			SubscrGrid.EditItemIndex = -1;
			// delete this subscriber (but not the user, if he has subscriptions to other lists)
			Business.Subscription subscription = new Business.Subscription((int)SubscrGrid.DataKeys[e.Item.ItemIndex]);
			subscription.Delete();

			BindGrid();
		}

		protected void AddNew_Click(object sender, EventArgs e)
		{
			if (Page.IsValid)
			{
				// add the new subscriber for this list
				Business.List list = new Business.List(int.Parse(ListsDropDown.SelectedItem.Value));
				if (list.AddSubscription(NewFirstName.Text, NewLastName.Text, 
					NewEmail.Text, NewActive.Checked).ID < 0)
				{
					// if the call to the Add method returned -1, it means that this user
					// was already subscribed to this list, so make visible the label that tells this
					AddNewError.Visible = true;	
				}
				
				// hide the controls for adding a new subscriber
				ShowAddNewControls(false);
				BindGrid();
			}
		}
		
		protected void CancelAddNew_Click(object sender, EventArgs e)
		{
			ShowAddNewControls(false);
		}

		protected void Create_Click(object sender, EventArgs e)
		{
			// show the controls for adding a new subscriber
			AddNewError.Visible = false;
			ShowAddNewControls(true);
			NewDate.DataBind();
			SubscrGrid.EditItemIndex = -1;
			BindGrid();
		}
		
		protected void ShowAddNewControls(bool ShowControls)
		{
			// show or hide the controls for adding a new subscriber
			NewFirstName.Text = "";
			NewLastName.Text = "";
			NewEmail.Text = "";
			NewActive.Checked = true;

			CreateNewRow.Visible = !ShowControls;
			AddNewResultCell.Visible = !ShowControls;
			AddNewControlsRow.Visible = ShowControls;
		}


		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			base.OnInit(e);
			InitializeComponent();
			
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion
	}
}