User Controls and Custom Server Controls, Part 2
Pages: 1, 2, 3, 4

Example 6-7: Blog.cs

using System;
using System.Data;
using System.Drawing;
using System.IO;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
  
namespace aspnetian
{
  
public class Blog:Panel, INamingContainer
{
  
   protected DataSet BlogDS;
   protected TextBox TitleTB;
   protected TextBox BlogText;
  
   private string _addRedirect;
   private string _email;
   private string _mode = "display";
  
   public string AddRedirect
   {
      get
      {
         return this._addRedirect;
      }
      set
      {
         this._addRedirect = value;
      }
   }
  
   public string Email
   {
      get
      {
         return this._email;
      }
      set
      {
         this._email = value;
      }
   }
  
   public string Mode
   {
      get
      {
         return this._mode;
      }
      set
      {
         this._mode = value;
      }
   }
  
   protected override void OnInit(EventArgs e)
   {
      LoadData(  );
      base.OnInit(e);
   }
  
   protected override void CreateChildControls(  )
   {
      if (this._mode.ToLower(  ) != "add")
      {
         DisplayBlogs(  );
      }
      else
      {
         NewBlog(  );
      }
   }
  
   protected void LoadData(  )
   {
      BlogDS = new DataSet(  );
  
      try
      {
         BlogDS.ReadXml(Page.Server.MapPath("Blog.xml"));
      }
      catch (FileNotFoundException fnfEx)
      {
         CreateBlankFile(  );
         LoadData(  );
      }
   }
  
   protected void DisplayBlogs(  )
   {
      DateTime BlogDate;
      DateTime CurrentDate = new DateTime(  );
  
      DataRowCollection BlogRows = BlogDS.Tables[0].Rows;
      foreach (DataRow BlogDR in BlogRows)
      {
         string BDate = BlogDR["date"].ToString(  );
         BlogDate = new DateTime(Convert.ToInt32(BDate.Substring(4, 4)), 
            Convert.ToInt32(BDate.Substring(0, 2)),
            Convert.ToInt32(BDate.Substring(2, 2)));
  
         if (CurrentDate != BlogDate)
         {
            Label Date = new Label(  );
            Date.Text = BlogDate.ToLongDateString(  );
            Date.Font.Size = FontUnit.Large;
            Date.Font.Bold = true;
            this.Controls.Add(Date);
            this.Controls.Add(new LiteralControl("<br/><br/>"));
            CurrentDate = BlogDate;
         }
  
         HtmlAnchor Anchor = new HtmlAnchor(  );
         Anchor.Name = "#" + BlogDR["anchorID"].ToString(  );
         this.Controls.Add(Anchor);
  
         Label Title = new Label(  );
         Title.Text = BlogDR["title"].ToString(  );
         Title.Font.Size = FontUnit.Larger;
         Title.Font.Bold = true;
         this.Controls.Add(Title);
         
         this.Controls.Add(new LiteralControl("<p>"));
         LiteralControl BlogText = new LiteralControl("<div>" +
            BlogDR["text"].ToString(  ) + "</div>");
         this.Controls.Add(BlogText);
         this.Controls.Add(new LiteralControl("</p>"));
  
         HyperLink Email = new HyperLink(  );
         Email.NavigateUrl = "mailto:" + BlogDR["email"].ToString(  );
         Email.Text = "E-mail me";
         this.Controls.Add(Email);
  
         this.Controls.Add(new LiteralControl(" | "));
  
         HyperLink AnchorLink = new HyperLink(  );
         AnchorLink.NavigateUrl = Page.Request.Url.ToString(  ) + "#" +
            BlogDR["anchorID"].ToString(  );
         AnchorLink.Text = "Link";
         this.Controls.Add(AnchorLink);
  
         this.Controls.Add(new LiteralControl("<hr width='100%'/><br/>"));
      }
   }
  
   protected void NewBlog(  )
   {
      Label Title = new Label(  );
      Title.Text = "Create New Blog";
      Title.Font.Size = FontUnit.Larger;
      Title.Font.Bold = true;
      this.Controls.Add(Title);
  
      this.Controls.Add(new LiteralControl("<br/><br/>"));
  
      Label TitleLabel = new Label(  );
      TitleLabel.Text = "Title: ";
      TitleLabel.Font.Bold = true;
      this.Controls.Add(TitleLabel);
      TitleTB = new TextBox(  );
      this.Controls.Add(TitleTB);
  
      this.Controls.Add(new LiteralControl("<br/>"));
      
      Label BlogTextLabel = new Label(  );
      BlogTextLabel.Text = "Text: ";
      BlogTextLabel.Font.Bold = true;
      this.Controls.Add(BlogTextLabel);
      BlogText = new TextBox(  );
      BlogText.TextMode = TextBoxMode.MultiLine;
      BlogText.Rows = 10;
      BlogText.Columns = 40;
      this.Controls.Add(BlogText);      
  
      this.Controls.Add(new LiteralControl("<br/>"));
  
      Button Submit = new Button(  );
      Submit.Text = "Submit";
      Submit.Click += new EventHandler(this.Submit_Click);
      this.Controls.Add(Submit);
   }
  
   protected void Submit_Click(object sender, EventArgs e)
   {
      EnsureChildControls(  );
      AddBlog(  );
   }
  
   protected void AddBlog(  )
   {
      DataRow NewBlogDR;
      NewBlogDR = BlogDS.Tables[0].NewRow(  );
      NewBlogDR["date"] = FormatDate(DateTime.Today);
      NewBlogDR["title"] = TitleTB.Text;
      NewBlogDR["text"] = BlogText.Text;
      NewBlogDR["anchorID"] = Guid.NewGuid().ToString(  );
      NewBlogDR["email"] = _email;
      BlogDS.Tables[0].Rows.InsertAt(NewBlogDR, 0);
      BlogDS.WriteXml(Page.Server.MapPath("Blog.xml"));
      Page.Response.Redirect(_addRedirect);
   }
  
   protected string FormatDate(DateTime dt)
   {
      string retString;
  
      retString = String.Format("{0:D2}", dt.Month);
      retString += String.Format("{0:D2}", dt.Day);
      retString += String.Format("{0:D2}", dt.Year);
      return retString;
   }
  
   protected void CreateBlankFile(  )
   {
      // code to create new file...omitted to conserve space
   }
  
} // closing bracket for class declaration
  
} // closing bracket for namespace declaration

Pages: 1, 2, 3, 4

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