HtmlContainerControl.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / HtmlControls / HtmlContainerControl.cs / 1305376 / 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. 
    ///  
    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"];
                // Dev10 703061 If InnerHtml is set, we want to clear out any child controls, but not dirty viewstate 
                if (s != null) {
                    Controls.Clear();
                    Controls.Add(new LiteralControl(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); 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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