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//---------------------------------------------------------------------
// <copyright file="EntityDataSourceWrapper.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner [....]
// @backupOwner [....]
//---------------------------------------------------------------------
using System;
using System.Data;
using System.Configuration;
using System.ComponentModel;
using System.Data.Common;
using System.Data.Metadata.Edm;
using System.Reflection;
using System.Data.Objects;
using System.Data.Objects.DataClasses;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Collections.ObjectModel;
using System.Text;
using System.Web.UI;
namespace System.Web.UI.WebControls
{
/// <summary>
/// Wraps an entity displayed in the data source in an ICustomTypeDescriptor
/// implementation that flattens complex types and exposes references.
/// </summary>
internal class EntityDataSourceWrapper : ICustomTypeDescriptor
{
private readonly EntityDataSourceWrapperCollection _collection;
private readonly ObjectStateEntry _stateEntry;
internal EntityDataSourceWrapper(EntityDataSourceWrapperCollection collection, object trackedEntity)
{
EntityDataSourceUtil.CheckArgumentNull(collection, "collection");
EntityDataSourceUtil.CheckArgumentNull(trackedEntity, "trackedEntity");
this._collection = collection;
// retrieve state entry
if (!this._collection.Context.ObjectStateManager.TryGetObjectStateEntry(trackedEntity, out _stateEntry))
{
throw new ArgumentException(Strings.ComponentNotFromProperCollection, "trackedEntity");
}
}
/// <summary>
/// Gets entity wrapped by this type descriptor.
/// </summary>
internal object WrappedEntity
{
get
{
return this._stateEntry.Entity;
}
}
internal RelationshipManager RelationshipManager
{
get
{
return this._stateEntry.RelationshipManager;
}
}
/// <summary>
/// Gets collection containing this wrapper.
/// </summary>
internal EntityDataSourceWrapperCollection Collection
{
get { return this._collection; }
}
#region ICustomTypeDescriptor Implementation
System.ComponentModel.AttributeCollection System.ComponentModel.ICustomTypeDescriptor.GetAttributes() { return new System.ComponentModel.AttributeCollection(); }
string ICustomTypeDescriptor.GetClassName() { return null; }
string ICustomTypeDescriptor.GetComponentName() { return null; }
TypeConverter ICustomTypeDescriptor.GetConverter() { return null; }
EventDescriptor ICustomTypeDescriptor.GetDefaultEvent() { return null; }
PropertyDescriptor ICustomTypeDescriptor.GetDefaultProperty() { return null; }
object ICustomTypeDescriptor.GetEditor(Type editorBaseType) { return null; }
EventDescriptorCollection ICustomTypeDescriptor.GetEvents() { return null; }
EventDescriptorCollection ICustomTypeDescriptor.GetEvents(Attribute[] attributes) { return null; }
public PropertyDescriptorCollection GetProperties()
{
return ((ITypedList)this._collection).GetItemProperties(null);
}
PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties(Attribute[] attributes)
{
return ((ICustomTypeDescriptor)this).GetProperties();
}
object ICustomTypeDescriptor.GetPropertyOwner(PropertyDescriptor pd)
{
return this.WrappedEntity;
}
#endregion ICustomTypeDescriptor Implementation
/// <summary>
/// Use this method to set the properties on the wrapped entity
/// </summary>
/// <param name="propertiesFromViewState"></param>
/// <param name="wrapper"></param>
/// <param name="overwriteSameValue"></param>
internal void SetAllProperties(Dictionary<string, object> propertiesFromViewState, bool overwriteSameValue,
ref Dictionary<string, Exception> propertySettingExceptionsCaught)
{
// We aggregate the reference descriptors rather than setting them directly
// to account for compound keys (we need all components of the key to create
// an EntityKey that can be set on the EntityReference)
var referenceList = new List<KeyValuePair<EntityDataSourceReferenceKeyColumn, object>>();
foreach (EntityDataSourceWrapperPropertyDescriptor descriptor in _collection.AllPropertyDescriptors)
{
// figure out which display name to match for this descriptor
string displayName = descriptor.Column.DisplayName;
// if we have a controlling column, use its display name instead
if (descriptor.Column.ControllingColumn != null)
{
displayName = descriptor.Column.ControllingColumn.DisplayName;
}
object value;
if (propertiesFromViewState.TryGetValue(displayName, out value))
{
// get all changed ReferencePropertyDescriptor from ViewState
EntityDataSourceReferenceKeyColumn referenceColumn = descriptor.Column as EntityDataSourceReferenceKeyColumn;
// convert the value as needed
object adjustedValue = EntityDataSourceUtil.ConvertType(value, descriptor.PropertyType, descriptor.DisplayName);
if (null != referenceColumn)
{
referenceList.Add(new KeyValuePair<EntityDataSourceReferenceKeyColumn, object>(
referenceColumn, adjustedValue));
continue;
}
if (overwriteSameValue || adjustedValue != descriptor.GetValue(this))
{
if (EntityDataSourceUtil.NullCanBeAssignedTo(descriptor.PropertyType) || null != adjustedValue)
{
try
{
descriptor.SetValue(this, adjustedValue);
}
catch (Exception e)
{
// The property descriptor uses reflection to set the property. Therefore, the inner exception contains the actual message.
Exception exceptionToThrow = e;
if (e.InnerException != null)
{
exceptionToThrow = e.InnerException;
}
if (null == propertySettingExceptionsCaught)
{
propertySettingExceptionsCaught = new Dictionary<string, Exception>();
}
propertySettingExceptionsCaught.Add(descriptor.DisplayName, exceptionToThrow);
}
}
}
}
}
// aggregate setting for EntityKey
SetEntityKeyProperties(referenceList, overwriteSameValue);
}
private void SetEntityKeyProperties(
List<KeyValuePair<EntityDataSourceReferenceKeyColumn, object>> referenceList, bool overwriteSameValue)
{
EntityDataSourceUtil.CheckArgumentNull(referenceList, "referenceList");
var groups = referenceList.GroupBy(r => r.Key.Group);
foreach (var group in groups)
{
Dictionary<string, object> partialKeys = new Dictionary<string, object>();
foreach (KeyValuePair<EntityDataSourceReferenceKeyColumn, object> reference in group)
{
// convert the value as needed
EntityDataSourceReferenceKeyColumn column = reference.Key;
object keyValue = reference.Value;
if (null == keyValue)
{
partialKeys = null;
break;
}
partialKeys.Add(column.KeyMember.Name, keyValue);
}
// we only set the entitykey for once, although there might be more than one
// properties descriptor associated with the same entitykey
group.Key.SetKeyValues(this, partialKeys);
}
}
}
}
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