/// <exclude />
public static IData GetReferenced(this IData refereeData, string foreignKeyPropertyName)
{
Verify.ArgumentNotNull(refereeData, "refereeData");
Verify.ArgumentNotNullOrEmpty(foreignKeyPropertyName, "foreignKeyPropertyName");
ForeignPropertyInfo foreignPropertyInfo =
(from fkpi in DataReferenceRegistry.GetForeignKeyProperties(refereeData.DataSourceId.InterfaceType)
where fkpi.SourcePropertyName == foreignKeyPropertyName
select fkpi).Single();
object sourceKeyValue = foreignPropertyInfo.SourcePropertyInfo.GetValue(refereeData, null);
// Handling of Nullable<>
if (sourceKeyValue == null)
{
return(null);
}
Type targetType = foreignPropertyInfo.TargetType;
var dataset = DataFacade.GetData(targetType);
IEnumerable queryResult = GetReferences(dataset, targetType, foreignPropertyInfo.TargetKeyPropertyInfo, sourceKeyValue, true);
foreach (var result in queryResult)
{
Verify.That(result is IData, "Query result should implement '{0}' interface", typeof(IData).FullName);
return(result as IData);
}
return(null);
}
private static bool HasReference(IQueryable queryable, ForeignPropertyInfo foreignPropertyInfo, object propertyValue)
{
var targetType = foreignPropertyInfo.TargetType;
var methodInfo = HasReferenceMethodInfo.MakeGenericMethod(new[] { targetType });
return((bool)methodInfo.Invoke(null, new[] { queryable, foreignPropertyInfo.TargetKeyPropertyInfo, propertyValue }));
}
internal static bool CascadeDeleteAllowed(this IData data)
{
Verify.ArgumentNotNull(data, "data");
ForeignPropertyInfo foreignPropertyInfo =
(from pi in DataReferenceRegistry.GetForeignKeyProperties(data.DataSourceId.InterfaceType)
where pi.AllowCascadeDeletes == false
select pi).FirstOrDefault();
return(foreignPropertyInfo == null);
}
/// <exclude />
public static bool TryGetReferenceType(this PropertyInfo propertyInfo, out Type typeBeingReferenced)
{
Verify.ArgumentNotNull(propertyInfo, "propertyInfo");
typeBeingReferenced = null;
lock (_lock)
{
if (_propertyReferenceTargetTypeLookup.TryGetValue(propertyInfo, out typeBeingReferenced) == false)
{
IEnumerable <ForeignPropertyInfo> foreignKeysOnType = DataReferenceRegistry.GetForeignKeyProperties(propertyInfo.DeclaringType);
ForeignPropertyInfo match = foreignKeysOnType.FirstOrDefault(f => f.SourcePropertyName == propertyInfo.Name);
typeBeingReferenced = (match != null ? match.TargetType : null);
_propertyReferenceTargetTypeLookup.Add(propertyInfo, typeBeingReferenced);
}
}
return(typeBeingReferenced != null);
}
private static IEnumerable GetReferences(IQueryable queryable, ForeignPropertyInfo foreignPropertyInfo, object keyValue, bool justOne)
{
Type sourceType = foreignPropertyInfo.SourcePropertyInfo.DeclaringType;
return(GetReferences(queryable, sourceType, foreignPropertyInfo.SourcePropertyInfo, keyValue, justOne));
}