WebControlToolBoxItem.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WebForms / System / Web / UI / Design / WebControlToolBoxItem.cs / 1 / WebControlToolBoxItem.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.Design { 
 
    using System;
    using System.Design; 
    using System.Reflection;
    using System.Runtime.Serialization;
    using System.ComponentModel;
    using System.ComponentModel.Design; 
    using System.Diagnostics;
    using System.Drawing; 
    using System.Drawing.Design; 
    using System.IO;
    using System.Web.UI; 

    /// 
    /// 
    ///  
    [
    System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode), 
    Serializable 
    ]
    public class WebControlToolboxItem : ToolboxItem { 

        private string toolData = null;
        private int persistChildren = -1;
 
        /// 
        public WebControlToolboxItem() { 
        } 

        ///  
        /// 
        /// Initializes a new instance of the  class.
        /// 
        public WebControlToolboxItem(Type type) : base(type) { 
            BuildMetadataCache(type);
        } 
 
        protected WebControlToolboxItem(SerializationInfo info, StreamingContext context) {
            Deserialize(info, context); 
        }

        private void BuildMetadataCache(Type type) {
            toolData = ExtractToolboxData(type); 
            persistChildren = ExtractPersistChildrenAttribute(type);
        } 
 
        /// 
        ///  
        ///    
        ///       Creates objects from each Type contained in this 
        ///       , and adds
        ///       them to the specified designer. 
        /// 
        protected override IComponent[] CreateComponentsCore(IDesignerHost host) { 
            throw new Exception(SR.GetString(SR.Toolbox_OnWebformsPage)); 
        }
 
        /// 
        /// 
        protected override void Deserialize(SerializationInfo info, StreamingContext context) {
            base.Deserialize(info, context); 

            toolData = info.GetString("ToolData"); 
            persistChildren = info.GetInt32("PersistChildren"); 
        }
 
        /// 
        ///   Extracts the value of the PersistChildrenAttribute attribute associated with the tool
        /// 
        private static int ExtractPersistChildrenAttribute(Type type) { 
            Debug.Assert(type != null);
 
            if (type != null) { 
                object[] attrs = type.GetCustomAttributes(typeof(PersistChildrenAttribute), /*inherit*/ true);
                if ((attrs != null) && (attrs.Length == 1)) { 
                    Debug.Assert(attrs[0] is PersistChildrenAttribute);
                    PersistChildrenAttribute pca = (PersistChildrenAttribute)attrs[0];

                    return (pca.Persist ? 1 : 0); 
                }
            } 
            return (PersistChildrenAttribute.Default.Persist ? 1 : 0); 
        }
 
        /// 
        ///   Extracts the value of the ToolboxData attribute associated with the tool
        /// 
        private static string ExtractToolboxData(Type type) { 
            Debug.Assert(type != null);
 
            string toolData = String.Empty; 
            if (type != null) {
                object[] attrs = type.GetCustomAttributes(typeof(ToolboxDataAttribute), /*inherit*/ false); 
                if ((attrs != null) && (attrs.Length == 1)) {
                    Debug.Assert(attrs[0] is ToolboxDataAttribute);
                    ToolboxDataAttribute toolDataAttr = (ToolboxDataAttribute)attrs[0];
 
                    toolData = toolDataAttr.Data;
                } 
                else { 
                    string typeName = type.Name;
                    toolData = "<{0}:" + typeName + " runat=\"server\">"; 
                }
            }

            return toolData; 
        }
 
        ///  
        public object GetToolAttributeValue(IDesignerHost host, Type attributeType) {
            if (attributeType == typeof(PersistChildrenAttribute)) { 
                if (persistChildren == -1) {
                    Type toolType = GetToolType(host);
                    persistChildren = ExtractPersistChildrenAttribute(toolType);
                } 

                return ((persistChildren == 1) ? true : false); 
            } 

            throw new ArgumentException(SR.GetString(SR.Toolbox_BadAttributeType)); 
        }

        /// 
        ///  
        ///    Gets the toolbox HTML that represents the corresponding web control on the design surface.
        ///  
        public string GetToolHtml(IDesignerHost host) { 
            if (toolData != null) {
                return toolData; 
            }

            // Create the HTML data that is to be droppped.
            Type toolType = GetToolType(host); 
            toolData = ExtractToolboxData(toolType);
 
            return toolData; 
        }
 
        /// 
        public Type GetToolType(IDesignerHost host) {
            if (host == null) {
                throw new ArgumentNullException("host"); 
            }
 
            return GetType(host, AssemblyName, TypeName, true); 
        }
 
        /// 
        public override void Initialize(Type type) {
            base.Initialize(type);
            BuildMetadataCache(type); 
        }
 
        ///  
        /// 
        protected override void Serialize(SerializationInfo info, StreamingContext context) { 
            base.Serialize(info, context);

            info.AddValue("ToolData", toolData);
            info.AddValue("PersistChildren", persistChildren); 
        }
    } 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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WebControlToolBoxItem.cs source code in C# .NET

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