CustomTypeDescriptor.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / ComponentModel / CustomTypeDescriptor.cs / 1 / CustomTypeDescriptor.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.ComponentModel 
{ 

    using System; 
    using System.Security.Permissions;

    /// 
    ///  
    [HostProtection(SharedState = true)]
    public abstract class CustomTypeDescriptor : ICustomTypeDescriptor 
    { 
        private ICustomTypeDescriptor _parent;
 
        /// 
        ///     Creates a new CustomTypeDescriptor object.  There are two versions
        ///     of this constructor. The version that takes no parameters simply
        ///     calls the version that takes a parent and passes null as the 
        ///     parent value.  If the parent is null, CustomTypeDescriptor returns
        ///     the defined default values for each method.  If the parent is 
        ///     non-null, CustomTypeDescriptor calls the parent's version of 
        ///     the method.
        ///  
        protected CustomTypeDescriptor()
        {
        }
 
        /// 
        ///     Creates a new CustomTypeDescriptor object.  There are two versions 
        ///     of this constructor. The version that takes no parameters simply 
        ///     calls the version that takes a parent and passes null as the
        ///     parent value.  If the parent is null, CustomTypeDescriptor returns 
        ///     the defined default values for each method.  If the parent is
        ///     non-null, CustomTypeDescriptor calls the parent's version of
        ///     the method.
        ///  
        protected CustomTypeDescriptor(ICustomTypeDescriptor parent)
        { 
            _parent = parent; 
        }
 
        /// 
        ///     The GetAttributes method returns the type-level attributes for
        ///     the type this custom type descriptor is providing information for.
        ///     You must always return a valid collection from this method. 
        /// 
        public virtual AttributeCollection GetAttributes() 
        { 
            if (_parent != null)
            { 
                return _parent.GetAttributes();
            }

            return AttributeCollection.Empty; 
        }
 
        ///  
        ///     The GetClassName method returns the fully qualified name of the
        ///     class this type descriptor is representing.  Returning null from 
        ///     this method causes the TypeDescriptor object to return the
        ///     default class name.
        /// 
        public virtual string GetClassName() 
        {
            if (_parent != null) 
            { 
                return _parent.GetClassName();
            } 

            return null;
        }
 
        /// 
        ///     The GetComponentName method returns the name of the component instance 
        ///     this type descriptor is describing. 
        /// 
        public virtual string GetComponentName() 
        {
            if (_parent != null)
            {
                return _parent.GetComponentName(); 
            }
 
            return null; 
        }
 
        /// 
        ///     The GetConverter method returns a type converter for the type this type
        ///     descriptor is representing.
        ///  
        public virtual TypeConverter GetConverter()
        { 
            if (_parent != null) 
            {
                return _parent.GetConverter(); 
            }

            return new TypeConverter();
        } 

        ///  
        ///     The GetDefaultEvent method returns the event descriptor for the default 
        ///     event on the object this type descriptor is representing.
        ///  
        public virtual EventDescriptor GetDefaultEvent()
        {
            if (_parent != null)
            { 
                return _parent.GetDefaultEvent();
            } 
 
            return null;
        } 

        /// 
        ///     The GetDefaultProperty method returns the property descriptor for the
        ///     default property on the object this type descriptor is representing. 
        /// 
        public virtual PropertyDescriptor GetDefaultProperty() 
        { 
            if (_parent != null)
            { 
                return _parent.GetDefaultProperty();
            }

            return null; 
        }
 
        ///  
        ///     The GetEditor method returns an editor of the given type that is
        ///     to be associated with the class this type descriptor is representing. 
        /// 
        public virtual object GetEditor(Type editorBaseType)
        {
            if (_parent != null) 
            {
                return _parent.GetEditor(editorBaseType); 
            } 

            return null; 
        }

        /// 
        ///     The GetEvents method returns a collection of event descriptors 
        ///     for the object this type descriptor is representing.  An optional
        ///     attribute array may be provided to filter the collection that is 
        ///     returned.  If no parent is provided,this will return an empty 
        ///     event collection.
        ///  
        public virtual EventDescriptorCollection GetEvents()
        {
            if (_parent != null)
            { 
                return _parent.GetEvents();
            } 
 
            return EventDescriptorCollection.Empty;
        } 

        /// 
        ///     The GetEvents method returns a collection of event descriptors
        ///     for the object this type descriptor is representing.  An optional 
        ///     attribute array may be provided to filter the collection that is
        ///     returned.  If no parent is provided,this will return an empty 
        ///     event collection. 
        /// 
        public virtual EventDescriptorCollection GetEvents(Attribute[] attributes) 
        {
            if (_parent != null)
            {
                return _parent.GetEvents(attributes); 
            }
 
            return EventDescriptorCollection.Empty; 
        }
 
        /// 
        ///     The GetProperties method returns a collection of property descriptors
        ///     for the object this type descriptor is representing.  An optional
        ///     attribute array may be provided to filter the collection that is returned. 
        ///     If no parent is provided,this will return an empty
        ///     property collection. 
        ///  
        public virtual PropertyDescriptorCollection GetProperties()
        { 
            if (_parent != null)
            {
                return _parent.GetProperties();
            } 

            return PropertyDescriptorCollection.Empty; 
        } 

        ///  
        ///     The GetProperties method returns a collection of property descriptors
        ///     for the object this type descriptor is representing.  An optional
        ///     attribute array may be provided to filter the collection that is returned.
        ///     If no parent is provided,this will return an empty 
        ///     property collection.
        ///  
        public virtual PropertyDescriptorCollection GetProperties(Attribute[] attributes) 
        {
            if (_parent != null) 
            {
                return _parent.GetProperties(attributes);
            }
 
            return PropertyDescriptorCollection.Empty;
        } 
 
        /// 
        ///     The GetPropertyOwner method returns an instance of an object that 
        ///     owns the given property for the object this type descriptor is representing.
        ///     An optional attribute array may be provided to filter the collection that is
        ///     returned.  Returning null from this method causes the TypeDescriptor object
        ///     to use its default type description services. 
        /// 
        public virtual object GetPropertyOwner(PropertyDescriptor pd) 
        { 
            if (_parent != null)
            { 
                return _parent.GetPropertyOwner(pd);
            }

            return null; 
        }
    } 
}
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CustomTypeDescriptor.cs source code in C# .NET

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