Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / System / data / design / DataSourceComponent.cs / 1 / DataSourceComponent.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All Rights Reserved. // Information Contained Herein is Proprietary and Confidential. // //----------------------------------------------------------------------------- namespace System.Data.Design { using System; using System.Collections; using System.Collections.Specialized; using System.ComponentModel; using System.ComponentModel.Design; using System.Diagnostics; using System.Xml; using System.Xml.Schema; using System.Xml.Serialization; internal abstract class DataSourceComponent : Component, ICustomTypeDescriptor, IObjectWithParent, IDataSourceCollectionMember, IDataSourceRenamableObject { private DataSourceCollectionBase collectionParent; internal protected virtual DataSourceCollectionBase CollectionParent { get { return collectionParent; } set { collectionParent = value; } } ////// return the object supports external properties /// protected virtual object ExternalPropertyHost { get { return null; } } ////// for IObjectWithParent /// [Browsable(false)] public virtual object Parent { get { return collectionParent; } } ////// Retrieves an array of member attributes for the given object. /// ////// the array of attributes on the class. This will never be null. /// ///AttributeCollection ICustomTypeDescriptor.GetAttributes() { return TypeDescriptor.GetAttributes(GetType()); } /// /// Retrieves the class name for this object. If null is returned, /// the type name is used. /// ////// The class name for the object, or null if the default will be used. /// ///string ICustomTypeDescriptor.GetClassName() { if (this is IDataSourceNamedObject) { return ((IDataSourceNamedObject)this).PublicTypeName; } return null; } /// /// Retrieves the name for this object. If null is returned, /// the default is used. /// ////// The name for the object, or null if the default will be used. /// ///string ICustomTypeDescriptor.GetComponentName() { INamedObject namedObject = this as INamedObject; return namedObject != null ? namedObject.Name : null; } /// /// Retrieves the type converter for this object. /// ////// A TypeConverter. If null is returned, the default is used. /// ///TypeConverter ICustomTypeDescriptor.GetConverter() { return TypeDescriptor.GetConverter(GetType()); } /// /// Retrieves the default event. /// ////// the default event, or null if there are no /// events /// ///EventDescriptor ICustomTypeDescriptor.GetDefaultEvent() { return TypeDescriptor.GetDefaultEvent(GetType()); } /// /// Retrieves the default property. /// ////// the default property, or null if there are no /// properties /// ///PropertyDescriptor ICustomTypeDescriptor.GetDefaultProperty() { return TypeDescriptor.GetDefaultProperty(GetType()); } /// /// Retrieves the an editor for this object. /// ////// An editor of the requested type, or null. /// ///object ICustomTypeDescriptor.GetEditor(Type editorBaseType) { return TypeDescriptor.GetEditor(GetType(), editorBaseType); } /// /// Retrieves an array of events that the given component instance /// provides. This may differ from the set of events the class /// provides. If the component is sited, the site may add or remove /// additional events. /// ////// an array of events this component surfaces. /// ///EventDescriptorCollection ICustomTypeDescriptor.GetEvents() { return TypeDescriptor.GetEvents(GetType()); } /// /// Retrieves an array of events that the given component instance /// provides. This may differ from the set of events the class /// provides. If the component is sited, the site may add or remove /// additional events. The returned array of events will be /// filtered by the given set of attributes. /// /// /// A set of attributes to use as a filter. /// /// If a MemberAttribute instance is specified and /// the event does not have an instance of that attribute's /// class, this will still include the event if the /// MemberAttribute is the same as it's Default property. /// ////// an array of events this component surfaces that match /// the given set of attributes.. /// ///EventDescriptorCollection ICustomTypeDescriptor.GetEvents(Attribute[] attributes) { return TypeDescriptor.GetEvents(GetType(), attributes); } /// /// Retrieves an array of properties that the given component instance /// provides. This may differ from the set of properties the class /// provides. If the component is sited, the site may add or remove /// additional properties. /// ////// an array of properties this component surfaces. /// ///PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties() { return GetProperties(null); } /// /// Retrieves an array of properties that the given component instance /// provides. This may differ from the set of properties the class /// provides. If the component is sited, the site may add or remove /// additional properties. The returned array of properties will be /// filtered by the given set of attributes. /// /// /// A set of attributes to use as a filter. /// /// If a MemberAttribute instance is specified and /// the property does not have an instance of that attribute's /// class, this will still include the property if the /// MemberAttribute is the same as it's Default property. /// ////// an array of properties this component surfaces that match /// the given set of attributes.. /// ///PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties(Attribute[] attributes) { return GetProperties(attributes); } private PropertyDescriptorCollection GetProperties(Attribute[] attributes) { return TypeDescriptor.GetProperties(GetType(), attributes); } /// /// Retrieves the object that directly depends on this value being edited. This is /// generally the object that is required for the PropertyDescriptor's GetValue and SetValue /// methods. If 'null' is passed for the PropertyDescriptor, the ICustomComponent /// descripotor implemementation should return the default object, that is the main /// object that exposes the properties and attributes, /// /// /// The PropertyDescriptor to find the owner for. This call should return an object /// such that the call "pd.GetValue(GetPropertyOwner(pd));" will generally succeed. /// If 'null' is passed for pd, the main object that owns the properties and attributes /// should be returned. /// ////// valueOwner /// ///object ICustomTypeDescriptor.GetPropertyOwner(PropertyDescriptor pd) { return this; } /// /// Returns an object representing a service provided by the component. /// /// type of the service ///protected override object GetService(Type service) { // Query service from its parent node if the object is not sited. // DataSourceComponent component = this; while (component != null && component.Site == null) { if (component.CollectionParent != null) { component = component.CollectionParent.CollectionHost; } else if (component.Parent != null && component.Parent is DataSourceComponent) { component = component.Parent as DataSourceComponent; } else { component = null; } } if (component != null && component.Site != null) { return component.Site.GetService(service); } return null; } /// /// IDataSourceCollectionMember implementation /// public virtual void SetCollection(DataSourceCollectionBase collection) { CollectionParent = collection; } ////// call this function to set value, so there will be componentChanging/Changed events /// /// call this function to set value, so there will be componentChanging/Changed events internal void SetPropertyValue(string propertyName, object value) { //bugbug removed } internal virtual StringCollection NamingPropertyNames { get { return null; } } // IDataSourceRenamableObject implementation [Browsable(false)] public virtual string GeneratorName { get { return null; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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