Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataWebControls / System / Data / WebControls / EntityDataSourceWrapperCollection.cs / 1305376 / EntityDataSourceWrapperCollection.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Data; using System.Configuration; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Collections; using System.ComponentModel; using System.Collections.Generic; using System.Data.Metadata.Edm; using System.Data.Mapping; using System.Data.Objects; using System.Reflection; using System.Diagnostics; using System.Data.Common; using System.Data.Objects.DataClasses; using System.Globalization; using System.Data.EntityClient; using System.Collections.ObjectModel; namespace System.Web.UI.WebControls { ////// Summary description for EntityDataSourceWrapperCollection /// internal class EntityDataSourceWrapperCollection : IEnumerable, ICollection, ITypedList { private readonly ObjectContext _context; private readonly List_wrapperList; /// /// Gets the property descriptors exposed to the user. /// private readonly PropertyDescriptorCollection _visiblePropertyDescriptors; ////// Gets all property descriptors. /// internal readonly ReadOnlyCollectionAllPropertyDescriptors; private readonly bool _isReadOnly; private readonly Type _clrEntityType; internal EntityDataSourceWrapperCollection(ObjectContext context, EntitySet entitySet, EntityType restrictedEntityType) { EntityDataSourceUtil.CheckArgumentNull(context, "context"); EntityDataSourceUtil.CheckArgumentNull(entitySet, "entitySet"); _context = context; _wrapperList = new List (); // get handles on the relevant workspaces MetadataWorkspace csWorkspace = ((EntityConnection)context.Connection).GetMetadataWorkspace(); MetadataWorkspace ocWorkspace = context.MetadataWorkspace; // if no restricted type is given, we assume the entity set element type is exposed EntityType entityType = restrictedEntityType ?? entitySet.ElementType; _clrEntityType = EntityDataSourceUtil.GetClrType(ocWorkspace, entityType); // if no restricted type is given and the set is polymorphic, make the collection readonly if (null == restrictedEntityType && 1 < EntityDataSourceUtil.GetTypeAndSubtypesOf(entityType, csWorkspace.GetItemCollection(DataSpace.CSpace), true).Count()) { _isReadOnly = true; } // gather the properties Type componentType = EntityDataSourceUtil.GetClrType(context.MetadataWorkspace, entityType); ReadOnlyCollection columns = EntityDataSourceUtil.GetNamedColumns(csWorkspace, ocWorkspace, entitySet, entityType); List visiblePropertyDescriptors = new List (columns.Count); List propertyDescriptors = new List (columns.Count); foreach (EntityDataSourceColumn column in columns) { var descriptor = new EntityDataSourceWrapperPropertyDescriptor(this, column); propertyDescriptors.Add(descriptor); // if the descriptor does not have a dependent, it is exposed to the user if (!descriptor.Column.IsHidden) { visiblePropertyDescriptors.Add(descriptor); } } _visiblePropertyDescriptors = new PropertyDescriptorCollection(visiblePropertyDescriptors.ToArray(), true); AllPropertyDescriptors = propertyDescriptors.AsReadOnly(); } internal EntityDataSourceWrapper AddWrappedEntity(object entity) { EntityDataSourceWrapper wrapper = new EntityDataSourceWrapper(this, entity); this._wrapperList.Add(wrapper); return wrapper; } #region IEnumerable Implementation IEnumerator IEnumerable.GetEnumerator() { return this._wrapperList.GetEnumerator(); } #endregion IEnumerable Implementation #region ICollection Implementation public int Count { get { return this._wrapperList.Count; } } public void CopyTo(Array array, int index) { ((ICollection)this._wrapperList).CopyTo(array, index); } public bool IsSynchronized { get { return false; } } public object SyncRoot { get { return null; } } #endregion #region ITypedList Implementation public PropertyDescriptorCollection GetItemProperties(PropertyDescriptor[] listAccessors) { if (null == listAccessors) { return this._visiblePropertyDescriptors ; } else { return null;// Implement this feature when we support traversing collections. } } string ITypedList.GetListName(PropertyDescriptor[] listAccessors) { return null; } #endregion #region Internal properties /// /// Gets CLR type or base type for entities exposed in this collection. /// internal Type ClrEntityType { get { return _clrEntityType; } } ////// Indicates whether this configuration supports modifications. /// internal bool IsReadOnly { get { return _isReadOnly; } } ////// Gets object context tracking the contents of this collection. /// internal ObjectContext Context { get { return _context; } } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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