EntitySetBaseCollection.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / Edm / EntitySetBaseCollection.cs / 1305376 / EntitySetBaseCollection.cs

                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data.Common; 
using System.Reflection;
using System.Text; 
using System.Diagnostics; 

namespace System.Data.Metadata.Edm 
{
    /// 
    /// Class representing a collection of entity set objects
    ///  
    internal sealed class EntitySetBaseCollection : MetadataCollection
    { 
        // This collection allows changes to be intercepted before and after they are passed to MetadataCollection.  The interception 
        // is required to update the EntitySet's back-reference to the EntityContainer.
 
        #region Constructors
        /// 
        /// Default constructor for constructing an empty collection
        ///  
        /// The entity container that has this entity set collection
        /// Thrown if the argument entityContainer is null 
        internal EntitySetBaseCollection(EntityContainer entityContainer) 
            : this(entityContainer, null)
        { 
        }

        /// 
        /// The constructor for constructing the collection with the given items 
        /// 
        /// The entity container that has this entity set collection 
        /// The items to populate the collection 
        /// Thrown if the argument entityContainer is null
        internal EntitySetBaseCollection(EntityContainer entityContainer, IEnumerable items) 
            : base(items)
        {
            EntityUtil.GenericCheckArgumentNull(entityContainer, "entityContainer");
            _entityContainer = entityContainer; 
        }
        #endregion 
 
        #region Fields
        private readonly EntityContainer _entityContainer; 
        #endregion

        #region Properties
        ///  
        /// Gets an item from the collection with the given index
        ///  
        /// The index to search for 
        /// An item from the collection
        /// Thrown if the index is out of the range for the Collection 
        /// Always thrown on setter
        public override EntitySetBase this[int index]
        {
            get 
            {
                return base[index]; 
            } 
            set
            { 
                throw EntityUtil.OperationOnReadOnlyCollection();
            }
        }
 
        /// 
        /// Gets an item from the collection with the given identity 
        ///  
        /// The identity of the item to search for
        /// An item from the collection 
        /// Thrown if identity argument passed in is null
        /// Thrown if the Collection does not have an EntitySet with the given identity
        /// Always thrown on setter
        public override EntitySetBase this[string identity] 
        {
            get 
            { 
                return base[identity];
            } 
            set
            {
                throw EntityUtil.OperationOnReadOnlyCollection();
            } 
        }
        #endregion 
 
        #region Methods
        ///  
        /// Adds an item to the collection
        /// 
        /// The item to add to the list
        /// Thrown if item argument is null 
        /// Thrown if the item passed in or the collection itself instance is in ReadOnly state
        /// Thrown if the EntitySetBase that is being added already belongs to another EntityContainer 
        /// Thrown if the EntitySetCollection already contains an EntitySet with the same identity 
        public override void Add(EntitySetBase item)
        { 
            EntityUtil.GenericCheckArgumentNull(item, "item");
            // Check to make sure the given entity set is not associated with another type
            ThrowIfItHasEntityContainer(item, "item");
            base.Add(item); 

            // Fix up the declaring type 
            item.ChangeEntityContainerWithoutCollectionFixup(_entityContainer); 
        }
 
        /// 
        /// Checks if the given entity set already has a entity container, if so, throw an exception
        /// 
        /// The entity set to check for 
        /// The name of the argument from the caller
        private static void ThrowIfItHasEntityContainer(EntitySetBase entitySet, string argumentName) 
        { 
            EntityUtil.GenericCheckArgumentNull(entitySet, argumentName);
            if (entitySet.EntityContainer != null) 
            {
                throw EntityUtil.EntitySetInAnotherContainer(argumentName);
            }
        } 
        #endregion
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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