EntityDataSourceReferenceGroup.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DataWebControls / System / Data / WebControls / EntityDataSourceReferenceGroup.cs / 1 / EntityDataSourceReferenceGroup.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.EntityClient; 
using System.Data.Metadata.Edm;
using System.Diagnostics; 
using System.Globalization; 
using System.Reflection;
using System.ComponentModel; 
using System.Data.Common;
using System.Data.Objects.DataClasses;
using System.Data.Objects;
using System.Data; 

namespace System.Web.UI.WebControls 
{ 
    /// 
    /// Groups together reference columns pointing at the same association end. 
    /// 
    internal abstract class EntityDataSourceReferenceGroup
    {
        private readonly AssociationSetEnd end; 

        protected EntityDataSourceReferenceGroup(AssociationSetEnd end) 
        { 
            EntityDataSourceUtil.CheckArgumentNull(end, "end");
 
            this.end = end;
        }

        internal AssociationSetEnd End { get { return this.end; } } 

        internal static EntityDataSourceReferenceGroup Create(Type entityType, AssociationSetEnd end) 
        { 
            EntityDataSourceUtil.CheckArgumentNull(entityType, "entityType");
 
            Type groupType = typeof(EntityDataSourceReferenceGroup<>).MakeGenericType(entityType);
            return (EntityDataSourceReferenceGroup)Activator.CreateInstance(groupType, new object[] { end });
        }
 
        internal abstract void SetKeyValues(EntityDataSourceWrapper wrapper, Dictionary newKeyValues);
 
        internal abstract EntityKey GetEntityKey(IEntityWithRelationships entity); 
    }
 
    internal class EntityDataSourceReferenceGroup : EntityDataSourceReferenceGroup
        where T : class, IEntityWithRelationships
    {
        public EntityDataSourceReferenceGroup(AssociationSetEnd end) 
            : base(end)
        { 
        } 

        internal override void SetKeyValues(EntityDataSourceWrapper wrapper, Dictionary newKeyValues) 
        {
            EntityDataSourceUtil.CheckArgumentNull(wrapper, "wrapper");

            EntityReference reference = GetRelatedReference((IEntityWithRelationships)wrapper.WrappedEntity); 

            EntityKey originalEntityKeys = reference.EntityKey; 
 

            if (null != newKeyValues) 
            {
                if(null != originalEntityKeys)
                {
                    // mix the missing keys from the original values 
                    foreach (var originalEntityKey in originalEntityKeys.EntityKeyValues)
                    { 
                        object newKeyValue; 
                        if (newKeyValues.TryGetValue(originalEntityKey.Key, out newKeyValue))
                        { 
                            // if any part of the key is null, the EntityKey is null
                            if (null == newKeyValue)
                            {
                                newKeyValues = null; 
                                break;
                            } 
                        } 
                        else
                        { 
                            // add the original value for this partial key since it is not saved in the viewstate
                            newKeyValues.Add(originalEntityKey.Key, originalEntityKey.Value);
                        }
                    } 
                }
                else 
                { 
                    // what we have in the newKeyValues should be sufficient to set the key
                    // but if any value is null, the whole key is null 
                    foreach (var newKey in newKeyValues)
                    {
                        if (null == newKey.Value)
                        { 
                            newKeyValues = null;
                            break; 
                        } 
                    }
                } 
            }

            if (null == newKeyValues)
            { 
                // if the entity key is a compound key, and if any partial key is null, then the entitykey is null
                reference.EntityKey = null; 
            } 
            else
            { 
                reference.EntityKey = new EntityKey(EntityDataSourceUtil.GetQualifiedEntitySetName(End.EntitySet), (IEnumerable>)newKeyValues);
            }
        }
 
        internal override EntityKey GetEntityKey(IEntityWithRelationships entity)
        { 
            EntityKey key = GetRelatedReference(entity).EntityKey; 
            return key;
        } 

        private EntityReference GetRelatedReference(IEntityWithRelationships entity)
        {
            EntityReference reference = entity.RelationshipManager.GetRelatedReference( 
                this.End.ParentAssociationSet.ElementType.FullName,
                this.End.CorrespondingAssociationEndMember.Name); 
            return reference; 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.EntityClient; 
using System.Data.Metadata.Edm;
using System.Diagnostics; 
using System.Globalization; 
using System.Reflection;
using System.ComponentModel; 
using System.Data.Common;
using System.Data.Objects.DataClasses;
using System.Data.Objects;
using System.Data; 

namespace System.Web.UI.WebControls 
{ 
    /// 
    /// Groups together reference columns pointing at the same association end. 
    /// 
    internal abstract class EntityDataSourceReferenceGroup
    {
        private readonly AssociationSetEnd end; 

        protected EntityDataSourceReferenceGroup(AssociationSetEnd end) 
        { 
            EntityDataSourceUtil.CheckArgumentNull(end, "end");
 
            this.end = end;
        }

        internal AssociationSetEnd End { get { return this.end; } } 

        internal static EntityDataSourceReferenceGroup Create(Type entityType, AssociationSetEnd end) 
        { 
            EntityDataSourceUtil.CheckArgumentNull(entityType, "entityType");
 
            Type groupType = typeof(EntityDataSourceReferenceGroup<>).MakeGenericType(entityType);
            return (EntityDataSourceReferenceGroup)Activator.CreateInstance(groupType, new object[] { end });
        }
 
        internal abstract void SetKeyValues(EntityDataSourceWrapper wrapper, Dictionary newKeyValues);
 
        internal abstract EntityKey GetEntityKey(IEntityWithRelationships entity); 
    }
 
    internal class EntityDataSourceReferenceGroup : EntityDataSourceReferenceGroup
        where T : class, IEntityWithRelationships
    {
        public EntityDataSourceReferenceGroup(AssociationSetEnd end) 
            : base(end)
        { 
        } 

        internal override void SetKeyValues(EntityDataSourceWrapper wrapper, Dictionary newKeyValues) 
        {
            EntityDataSourceUtil.CheckArgumentNull(wrapper, "wrapper");

            EntityReference reference = GetRelatedReference((IEntityWithRelationships)wrapper.WrappedEntity); 

            EntityKey originalEntityKeys = reference.EntityKey; 
 

            if (null != newKeyValues) 
            {
                if(null != originalEntityKeys)
                {
                    // mix the missing keys from the original values 
                    foreach (var originalEntityKey in originalEntityKeys.EntityKeyValues)
                    { 
                        object newKeyValue; 
                        if (newKeyValues.TryGetValue(originalEntityKey.Key, out newKeyValue))
                        { 
                            // if any part of the key is null, the EntityKey is null
                            if (null == newKeyValue)
                            {
                                newKeyValues = null; 
                                break;
                            } 
                        } 
                        else
                        { 
                            // add the original value for this partial key since it is not saved in the viewstate
                            newKeyValues.Add(originalEntityKey.Key, originalEntityKey.Value);
                        }
                    } 
                }
                else 
                { 
                    // what we have in the newKeyValues should be sufficient to set the key
                    // but if any value is null, the whole key is null 
                    foreach (var newKey in newKeyValues)
                    {
                        if (null == newKey.Value)
                        { 
                            newKeyValues = null;
                            break; 
                        } 
                    }
                } 
            }

            if (null == newKeyValues)
            { 
                // if the entity key is a compound key, and if any partial key is null, then the entitykey is null
                reference.EntityKey = null; 
            } 
            else
            { 
                reference.EntityKey = new EntityKey(EntityDataSourceUtil.GetQualifiedEntitySetName(End.EntitySet), (IEnumerable>)newKeyValues);
            }
        }
 
        internal override EntityKey GetEntityKey(IEntityWithRelationships entity)
        { 
            EntityKey key = GetRelatedReference(entity).EntityKey; 
            return key;
        } 

        private EntityReference GetRelatedReference(IEntityWithRelationships entity)
        {
            EntityReference reference = entity.RelationshipManager.GetRelatedReference( 
                this.End.ParentAssociationSet.ElementType.FullName,
                this.End.CorrespondingAssociationEndMember.Name); 
            return reference; 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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EntityDataSourceReferenceGroup.cs source code in C# .NET

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