ParseChildrenAsPropertiesAttribute.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 / ParseChildrenAsPropertiesAttribute.cs / 1 / ParseChildrenAsPropertiesAttribute.cs
                        

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

namespace System.Web.UI { 
 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Security.Permissions;
    using System.Web.Util;
 
    /// 
    /// Define the metadata attribute that controls use to mark the fact 
    /// that their children are in fact properties. 
    /// Furthermore, if a string is passed in the constructor, it specifies
    /// the name of the defaultproperty. 
    /// 
    [AttributeUsage(AttributeTargets.Class)]
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public sealed class ParseChildrenAttribute : Attribute { 

 
        public static readonly ParseChildrenAttribute ParseAsChildren = new ParseChildrenAttribute(false, false); 

 
        public static readonly ParseChildrenAttribute ParseAsProperties = new ParseChildrenAttribute(true, false);


        public static readonly ParseChildrenAttribute Default = ParseAsChildren; 

        private bool _childrenAsProps; 
        private string _defaultProperty; 
        private Type _childControlType;
 
        private bool _allowChanges = true;


        ///  
        /// Needed to use named parameters (ASURT 78869)
        ///  
        public ParseChildrenAttribute() : this(false, null) { 
        }
 

        /// 
        /// 
        public ParseChildrenAttribute(bool childrenAsProperties) : this(childrenAsProperties, null) { 
        }
 
        public ParseChildrenAttribute(Type childControlType) : this(false, null) { 
            if (childControlType == null) {
                throw new ArgumentNullException("childControlType"); 
            }

            _childControlType = childControlType;
        } 

        ///  
        /// Needed to create immutable static readonly instances of this attribute 
        /// 
        private ParseChildrenAttribute(bool childrenAsProperties, bool allowChanges) : this(childrenAsProperties, null) { 
            _allowChanges  = allowChanges;
        }

 
        /// 
        ///  
        public ParseChildrenAttribute(bool childrenAsProperties, string defaultProperty) { 
            _childrenAsProps = childrenAsProperties;
            if (_childrenAsProps == true) { 
                _defaultProperty = defaultProperty;
            }
        }
 

        ///  
        ///    Indicates the allowed child control type. 
        ///       This property is read-only.
        ///  
        public Type ChildControlType {
            get {
                if (_childControlType == null) {
                    return typeof(System.Web.UI.Control); 
                }
 
                return _childControlType; 
            }
        } 


        /// 
        ///  
        public bool ChildrenAsProperties {
            get { 
                return _childrenAsProps; 
            }
            set { 
                if (_allowChanges == false) {
                    throw new NotSupportedException();
                }
                _childrenAsProps = value; 
            }
        } 
 

        ///  
        /// 
        public string DefaultProperty {
            get {
                if (_defaultProperty == null) { 
                    return String.Empty;
                } 
                return _defaultProperty; 
            }
            set { 
                if (_allowChanges == false) {
                    throw new NotSupportedException();
                }
                _defaultProperty = value; 
            }
        } 
 

        ///  
        /// 
        /// 
        public override int GetHashCode() {
            if (_childrenAsProps == false) { 
                return HashCodeCombiner.CombineHashCodes(_childrenAsProps.GetHashCode(), _childControlType.GetHashCode());
            } 
            else { 
                return HashCodeCombiner.CombineHashCodes(_childrenAsProps.GetHashCode(), DefaultProperty.GetHashCode());
            } 
        }


        ///  
        /// 
        ///  
        public override bool Equals(object obj) { 
            if (obj == this) {
                return true; 
            }

            ParseChildrenAttribute pca = obj as ParseChildrenAttribute;
            if (pca != null) { 
                if (_childrenAsProps == false) {
                    return pca.ChildrenAsProperties == false && 
                        pca._childControlType == _childControlType; 
                }
                else { 
                    return pca.ChildrenAsProperties && (DefaultProperty.Equals(pca.DefaultProperty));
                }
            }
            return false; 
        }
 
 
        /// 
        ///  
        /// 
        public override bool IsDefaultAttribute() {
            return this.Equals(Default);
        } 
    }
}

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