HtmlContainerControl.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / HtmlControls / HtmlContainerControl.cs / 1 / HtmlContainerControl.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.HtmlControls { 
    using System.Runtime.Serialization.Formatters; 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.IO;
    using System.Web.UI;
    using System.Security.Permissions; 

/* 
 *  A control representing an intrinsic Html tag. 
 */
 
    /// 
    /// The 
    /// class defines the methods,
    /// properties and events 
    /// available to all Html Server controls that must have a
    /// closing tag. 
    ///  
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    abstract public class HtmlContainerControl : HtmlControl {
        /*
         * Creates a new WebControl
         */ 

        ///  
        /// Initializes a new instance of a  class using 
        ///    default values.
        ///  
        protected HtmlContainerControl() : this("span") {
        }

        /* 
         *  Creates a new HtmlContainerControl
         */ 
 
        /// 
        /// Initializes a new instance of a  class using the 
        ///    specified string.
        /// 
        public HtmlContainerControl(string tag) : base(tag) {
        } 

        /* 
         * The inner html content between the begin and end tag. 
         * A set will replace any existing child controls with a single literal.
         * A get will return the text of a single literal child OR 
         * will throw an exception if there are no children, more than one
         * child, or the single child is not a literal.
         */
 
        /// 
        ///     
        ///       Gets or sets the 
        ///       content found between the opening and closing tags of the specified HTML server control.
        ///     
        /// 
        [
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        HtmlControlPersistable(false),
        ] 
        public virtual string InnerHtml { 
            get {
                if (IsLiteralContent()) 
                    return((LiteralControl) Controls[0]).Text;
                else if (HasControls() && (Controls.Count == 1) && Controls[0] is DataBoundLiteralControl)
                    return ((DataBoundLiteralControl) Controls[0]).Text;
                else { 
                    if (Controls.Count == 0)
                        return String.Empty; 
 
                    throw new HttpException(SR.GetString(SR.Inner_Content_not_literal, ID));
                } 
            }

            set {
                Controls.Clear(); 
                Controls.Add(new LiteralControl(value));
                ViewState["innerhtml"] = value; 
            } 
        }
 
        /*
         * The inner text content between the begin and end tag.
         * A set will replace any existing child controls with a single literal.
         * A get will return the text of a single literal child OR 
         * will throw an exception if there are no children, more than one child, or
         * the single child is not a literal. 
         */ 

        ///  
        ///    
        ///       Gets or sets all text between the opening and closing tags
        ///       of the specified HTML server control.
        ///     
        /// 
        [ 
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        HtmlControlPersistable(false), 
        ]
        public virtual string InnerText {
            get {
                return HttpUtility.HtmlDecode(InnerHtml); 
            }
 
            set { 
                InnerHtml = HttpUtility.HtmlEncode(value);
            } 
        }


 
        /// 
        ///    [To be supplied.] 
        ///  
        protected override ControlCollection CreateControlCollection() {
            return new ControlCollection(this); 
        }


        ///  
        /// 
        ///  
        protected override void LoadViewState(object savedState) { 
            if (savedState != null) {
                base.LoadViewState(savedState); 
                string s = (string)ViewState["innerhtml"];
                if (s != null)
                    InnerHtml = s;
            } 
        }
 
 
        /*
         * Render the control into the given writer. 
         */

        /// 
        ///  
        /// 
        protected internal override void Render(HtmlTextWriter writer) { 
            RenderBeginTag(writer); 
            RenderChildren(writer);
            RenderEndTag(writer); 
        }

        /*
         * Override to prevent InnerHtml from being rendered as an attribute. 
         */
 
        ///  
        /// 
        ///  
        protected override void RenderAttributes(HtmlTextWriter writer) {
            ViewState.Remove("innerhtml");
            base.RenderAttributes(writer);
        } 

        /* 
         * Render the end tag, </TAGNAME>. 
         */
 
        /// 
        /// 
        /// 
        protected virtual void RenderEndTag(HtmlTextWriter writer) { 
            writer.WriteEndTag(TagName);
        } 
    } 
}

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