控制自定義控件設計時的表現

 最近做一個自定義控件,控件裏有一個隱藏的div,在設計時會把不整個頁面撐開,甚至是aspx在設計與html切換時會改變整個面頁的佈局,如何解決這個問題.自已搞了很久沒有搞定,後來在csdn裏請高手解決了.http://community.csdn.net/Expert/topic/4930/4930751.xml?temp=.9275324

在csdn提問之前我也在msdn裏找到了下面這個幫助,但由於比較急,沒有細看.呵呵,以後做事一定保持平靜,這樣可能會少走彎路.

還有,System.Web.UI.Design需要引進System.Design.dll

 

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

namespace WebControlDesignerExample
...{    
    // This control designer offers designer verb menu commands
    // that can alter the design time html provided for the 
    // System.Web.UI.Control this designer supports.
    public class TextSizeWebControlDesigner : System.Web.UI.Design.ControlDesigner
    ...{
        // Whether to display the html of the associated 
        // control using a large heading text size.
        private bool LargeText;        

        public TextSizeWebControlDesigner() : base()
        ...{
            LargeText = false;                  
        }

        // Provides a menu command to toggle the text size.
        public override System.ComponentModel.Design.DesignerVerbCollection Verbs
        ...{
            get
            ...{
                DesignerVerbCollection dvc = new DesignerVerbCollection();
                if( LargeText )
                    dvc.Add( new DesignerVerb("Reduce text size", new EventHandler(this.toggleTextSize)) );
                else
                    dvc.Add( new DesignerVerb("Enlarge text size", new EventHandler(this.toggleTextSize)) );
                return dvc;
            }
        }

        // Returns the html to use to represent the control at design time.
        public override string GetDesignTimeHtml()
        ...{
            string html = base.GetDesignTimeHtml();

            if( LargeText )
                return "<H1>"+html+"</H1>";
            else
                return "<H3>"+html+"</H3>";                        
        }        

        // Event handler to toggle whether the html receives a large or 
        // small size heading markup tag.
        private void toggleTextSize(object sender, EventArgs e)
        ...{
            if( LargeText )
                LargeText = false;
            else
                LargeText = true;
            this.IsDirty = true;
            this.UpdateDesignTimeHtml();
        }        
    }

    // Simple text web control renders a text string.
    // This control is associated with the TextSizeWebControlDesigner.
    [DesignerAttribute(typeof(TextSizeWebControlDesigner), typeof(IDesigner))]
    public class TextControl : System.Web.UI.WebControls.WebControl
    ...{
        private string text;

        [Bindable(true),
            Category("Appearance"),
            DefaultValue("")]
        public string Text
        ...{
            get
            ...{
                return text;
            }

            set
            ...{
                text = value;
            }
        }

        public TextControl()
        ...{
            text = "Test phrase";
        }

        protected override void Render(HtmlTextWriter output)
        ...{
            output.Write(Text);
        }
    }    
}