displaytopic.cs

ASP开发网站的 关于网站的设计和说明 还有SQL的程序 数据库

namespace ASPNET.StarterKit.Communities {

    using System;
    using System.Web.UI;
    using System.Web.UI.WebControls;
	using System.ComponentModel;

    //*********************************************************************
    //
    // DisplayTopic Class
    //
    // This control displays either a topic name or topic image that
    // links to the Topic page.
    //
    //*********************************************************************
   	[Designer(typeof(ASPNET.StarterKit.Communities.CommunityDesigner))]	
    public class DisplayTopic : WebControl {
    
    
        string _name = String.Empty;
        string _image = String.Empty;
        bool _alwaysDisplay = false;

       
        public DisplayTopic() : base() {
            // Set CSS Class
            CssClass = "displayTopic";
            
            // Get ContentInfo from context
			if (Context != null) {
				Object objContentInfo = Context.Items["ContentInfo"];
				if (objContentInfo != null) {
					_name = ((ContentInfo)objContentInfo).TopicName;
					_image = ((ContentInfo)objContentInfo).TopicImage;
				}
			}
        }

    

       
        public string Name {
            get { return _name;}
            set { _name = value; }
        
        }


        public string Image {
            get { return _image; }  
            set { _image = value; }
        
        }
       
       


       
        
        //*********************************************************************
        //
        // AlwaysDisplay Property
        //
        // Enables you to display a topic even when topics are disabled
        // for a section. This property is set by the skin for the topic menu.
        //
        //*********************************************************************

        public bool AlwaysDisplay {
            get { return _alwaysDisplay; }
            set { _alwaysDisplay = value; }
        }
       
       
        
        //*********************************************************************
        //
        // Render Method
        //
        // Only render if topics are enabled. We need to check for the existence
        // of context to avoid a Designer error in Visual Studio .NET
        //
        //*********************************************************************

        protected override void Render(HtmlTextWriter tw) {
            if (_alwaysDisplay) {
                base.Render(tw);
                return;
            }
            
            if (Context.Items["SectionInfo"] != null) {
                SectionInfo objSectionInfo = (SectionInfo)Context.Items["SectionInfo"];
            
                if (objSectionInfo.EnableTopics)
                    base.Render(tw);
            } 
        }
       
        
        //*********************************************************************
        //
        // RenderContents Method
        //
        // Renders either the name or image for the topic.
        //
        //*********************************************************************

        protected override void RenderContents(HtmlTextWriter tw) {
            string imageTag;
            string imagePath;

            // Calculate topic path
            string topicPath = String.Format("~/Topic.aspx?topic={0}", Context.Server.UrlEncode(_name));
            topicPath = Page.ResolveUrl(topicPath); 
            
            
            tw.AddAttribute(HtmlTextWriterAttribute.Href, topicPath);
            tw.RenderBeginTag(HtmlTextWriterTag.A);
            if (Image == String.Empty)
                tw.Write( _name );
            else {
                imagePath = Page.ResolveUrl( "~/" + _image);
                imageTag = String.Format("<img src=\"{0}\" ALT=\"{1}\" border=\"0\">", imagePath, _name);
                tw.Write(imageTag);
            }
            tw.RenderEndTag();
        }


    }
}