/// <summary>
/// Given a data source column name, returns the corresponding Entity-SQL. If
/// we are using the wrapper, we defer to the property descriptor to get
/// the string. If there is no wrapper (or no corresponding property descriptor)
/// we use the column name directly.
/// </summary>
/// <param name="columnName">Column name for which we produce a value expression.</param>
/// <returns>Entity-SQL for column.</returns>
internal static string GetEntitySqlValueForColumnName(string columnName, EntityDataSourceWrapperCollection wrapperCollection)
{
Debug.Assert(!String.IsNullOrEmpty(columnName), "columnName must be given");
string result = null;
if (wrapperCollection != null)
{
// use wrapper definition if it is available
EntityDataSourceWrapperPropertyDescriptor descriptor =
wrapperCollection.GetItemProperties(null).Find(columnName, false) as EntityDataSourceWrapperPropertyDescriptor;
if (null != descriptor)
{
result = descriptor.Column.GetEntitySqlValue();
}
}
// if descriptor does not provide SQL, create the default: it._columnName_
if (null == result)
{
result = EntitySqlElementAlias + "." + QuoteEntitySqlIdentifier(columnName);
}
return(result);
}
internal EntityDataSourceWrapperCollection(ObjectContext context, EntitySet entitySet, EntityType restrictedEntityType)
{
EntityDataSourceUtil.CheckArgumentNull(context, "context");
EntityDataSourceUtil.CheckArgumentNull(entitySet, "entitySet");
_context = context;
_wrapperList = new List <EntityDataSourceWrapper>();
// 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
ReadOnlyCollection <EntityDataSourceColumn> columns = EntityDataSourceUtil.GetNamedColumns(csWorkspace, ocWorkspace, entitySet, entityType);
List <PropertyDescriptor> visiblePropertyDescriptors = new List <PropertyDescriptor>(columns.Count);
List <EntityDataSourceWrapperPropertyDescriptor> propertyDescriptors = new List <EntityDataSourceWrapperPropertyDescriptor>(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 EntityDataSourceWrapperCollection(ObjectContext context, EntitySet entitySet, EntityType restrictedEntityType)
{
EntityDataSourceUtil.CheckArgumentNull(context, "context");
EntityDataSourceUtil.CheckArgumentNull(entitySet, "entitySet");
_context = context;
_wrapperList = new List<EntityDataSourceWrapper>();
// 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
ReadOnlyCollection<EntityDataSourceColumn> columns = EntityDataSourceUtil.GetNamedColumns(csWorkspace, ocWorkspace, entitySet, entityType);
List<PropertyDescriptor> visiblePropertyDescriptors = new List<PropertyDescriptor>(columns.Count);
List<EntityDataSourceWrapperPropertyDescriptor> propertyDescriptors = new List<EntityDataSourceWrapperPropertyDescriptor>(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();
}
