C#编程

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StrawPoll.cs：源码内容
							using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
namespace PCSCustomWebControls
{
   public enum pollStyle
   {
      voteonly,
      valuesonly,
      voteandvalues
   }
   [ControlBuilderAttribute(typeof(StrawPollControlBuilder))]
   [ParseChildren(false)]
   public class StrawPoll : System.Web.UI.WebControls.WebControl,
      INamingContainer
   {
      public event CandidateEventHandler Voted;
      protected void OnVoted(CandidateEventArgs e)
      {
         if (Voted != null)
         {
            Voted(this, e);
         }
      }
      internal void ChildVote(CandidateEventArgs e)
      {
         OnVoted(e);
      }
      public StrawPoll()
      {
         //
         // TODO: Add constructor logic here
         //
      }
      public string Title
      {
         get
         {
            object rawTitle = ViewState["_title"];
            if (rawTitle != null)
            {
               return (string)rawTitle;
            }
            else
            {
               ViewState["_title"] = "Straw Poll";
               return "Straw Poll";
            }
         }
         set
         {
            ViewState["_title"] = value;
         }
      }
      public pollStyle PollStyle
      {
         get
         {
            object rawPollStyle = ViewState["_pollStyle"];
            if (rawPollStyle != null)
            {
               return (pollStyle)rawPollStyle;
            }
            else
            {
               ViewState["_pollStyle"] = pollStyle.voteandvalues;
               return pollStyle.voteandvalues;
            }
         }
         set
         {
            ViewState["_pollStyle"] = value;
         }
      }
      protected override void Render(HtmlTextWriter output)
      {
         Candidate currentCandidate;
         long iTotalVotes = 0;
         long iPercentage = 0;
         int iColumns = 2;
         // Start table, display title
         if (PollStyle == pollStyle.voteandvalues)
         {
            iColumns = 3;
         }
         output.Write("<TABLE border='1' bordercolor='black'" 
            + " bgcolor='#DDDDBB'"
            + " width='90%' cellpadding='1' cellspacing='1'"
            + " align='center'>");
         output.Write("<TR><TD colspan='" + iColumns 
            + "' align='center'"
            + " bgcolor='#FFFFDD'>");
         output.Write("<B>" + Title + "</B></TD></TR>");
         if (Controls.Count == 0)
         {
            // Default text when no options contained
            output.Write("<TR><TD bgcolor='#FFFFDD'>No options to"
               + " display.</TR></TD>");
         }
         else
         {
            // Get total votes
            for (int iLoop = 0; iLoop < Controls.Count; iLoop++)
            {
               // Get option
               currentCandidate = (Candidate)Controls[iLoop];
               // Sum votes cast
               iTotalVotes += currentCandidate.Votes;
            }
            // Render each option
            for (int iLoop = 0; iLoop < Controls.Count; iLoop++)
            {
               // Get option
               currentCandidate = (Candidate)Controls[iLoop];
               // Place option name in first column
               output.Write("<TR><TD bgcolor='#FFFFDD' width='15%'> "
                  + currentCandidate.Name + " </TD>");
               // Add voting option to second column if required
               if (PollStyle != pollStyle.valuesonly)
               {
                  output.Write("<TD width='1%' bgcolor='#FFFFDD'>"
                     + "<FONT color='#FFFFDD'>.</FONT>");
                  currentCandidate.RenderControl(output);
                  output.Write("<FONT color='#FFFFDD'>.</FONT></TD>");
               }
               // Place graph, value, and percentage in third
               // column if required
               if (PollStyle != pollStyle.voteonly)
               {
                  if (iTotalVotes > 0)
                  {
                     iPercentage = (currentCandidate.Votes * 100) /
                        iTotalVotes;
                  }
                  else
                  {
                     iPercentage = 0;
                  }
                  output.Write("<TD bgcolor='#FFFFDD'>"
                     + "<TABLE width='100%'>"
                     + "<TR><TD><TABLE border='1' bordercolor='black'"
                     + " width='100%' cellpadding='0'"
                     + " cellspacing='0'>");
                  output.Write("<TR><TD bgcolor='red' width='"
                     + iPercentage
                     + "%'><FONT color='red'>.</FONT></TD>");
                  output.Write("<TD bgcolor='white' width='"
                     + (100-iPercentage)
                     + "%'><FONT color='white'>."
                     + "</FONT></TD></TR></TABLE></TD>");
                  output.Write("<TD width='75'>"
                     + currentCandidate.Votes + " ("
                     + iPercentage
                     + "%)</TD></TR></TABLE></TD>");
               }
               // End row
               output.Write("</TR>");
            }
            // Show total votes cast if values displayed
            if (PollStyle != pollStyle.voteonly)
            {
               output.Write("<TR><TD bgcolor='#FFFFDD' colspan='"
                  + iColumns
                  + "'>Total votes cast: " + iTotalVotes
                  + "</TD></TR>");
            }
         }
         // Finish table
         output.Write("</TABLE>");
      }
   }
}

						