/// <summary>
/// </summary>
/// <param name="itemInstanceTypeToCreate">The type of DatabaseObjects.DatabaseObject to create.</param>
/// <param name="databaseObjects">Parameter that is passed to the constructor of the DatabaseObject to create. If there is a default constructor then this argument is not used.</param>
public static IDatabaseObject CreateItemInstance(Type itemInstanceTypeToCreate, DatabaseObjects databaseObjects)
{
object objObjectInstance = null;
foreach (ConstructorInfo objConstructor in itemInstanceTypeToCreate.GetConstructors(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
{
ParameterInfo[] objConstructorParameters = objConstructor.GetParameters();
if (objConstructorParameters.Length == 0)
{
objObjectInstance = objConstructor.Invoke(null);
break;
}
else if (objConstructorParameters.Length == 1 && (objConstructorParameters[0].ParameterType.IsSubclassOf(typeof(DatabaseObjects)) || objConstructorParameters[0].ParameterType.Equals(typeof(DatabaseObjects))))
{
objObjectInstance = objConstructor.Invoke(new[] {databaseObjects});
break;
}
}
if (objObjectInstance == null)
throw new Exceptions.DatabaseObjectsException("An empty constructor or constructor with argument DatabaseObjects.DatabaseObjects (or subclass) could not be found for type '" + itemInstanceTypeToCreate.FullName + "'. This type has been specified by the ItemInstanceAttribute for the type '" + databaseObjects.GetType().FullName + "' or as the T argument.");
else if (!(objObjectInstance is IDatabaseObject))
throw new Exceptions.DatabaseObjectsException("'" + itemInstanceTypeToCreate.FullName + "' does not implement IDatabaseObject or inherit from DatabaseObject. Type was specified for use by the ItemInstanceAttribute on the type '" + databaseObjects.GetType().FullName + "'");
else
return (IDatabaseObject)objObjectInstance;
}
public DatabaseObjectsUsingAttributesHelper(DatabaseObjects objDatabaseObjects)
{
if (objDatabaseObjects == null)
throw new ArgumentNullException();
pobjDatabaseObjects = objDatabaseObjects;
object[] objAttributes = objDatabaseObjects.GetType().GetCustomAttributes(true);
if (objAttributes != null)
{
foreach (Attribute objAttribute in objAttributes)
{
if (objAttribute is DistinctFieldAttribute)
pobjDistinctField = (DistinctFieldAttribute) objAttribute;
else if (objAttribute is KeyFieldAttribute)
pobjKeyField = (KeyFieldAttribute) objAttribute;
else if (objAttribute is OrderByFieldAttribute)
pobjOrderByAttributes.Add((OrderByFieldAttribute) objAttribute);
else if (objAttribute is SubsetAttribute)
pobjSubset = (SubsetAttribute) objAttribute;
else if (objAttribute is TableAttribute)
pobjTable = (TableAttribute) objAttribute;
else if (objAttribute is TableJoinAttribute)
pobjTableJoins.Add((TableJoinAttribute) objAttribute);
else if (objAttribute is ItemInstanceAttribute)
pobjItemInstance = (ItemInstanceAttribute) objAttribute;
}
}
}