EntityDataSourceWrapperCollection.cs source code in C# .NET

                        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 ReadOnlyCollection AllPropertyDescriptors; 
 
        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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EntityDataSourceWrapperCollection.cs source code in C# .NET

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