static public DataServiceState Save(DataServiceContext context, Dictionary<string,object> collections)
{
List<Type> knownTypes = GetKnownTypes(context);
Dictionary<EntityDescriptor, Guid> entityDescriptorToId;
ContextState contextState = context.SaveState(out entityDescriptorToId);
string contextAsString = SerializeContextToString(contextState, knownTypes);
var collectionsState = new Dictionary<string, CollectionState>();
if (collections != null)
{
foreach (KeyValuePair<string, object> kvp in collections)
{
IDataServiceCollection collection = (IDataServiceCollection) kvp.Value;
CollectionState collectionState = collection.SaveState(context, entityDescriptorToId);
collectionsState.Add(kvp.Key, collectionState);
}
}
DataServiceState state = new DataServiceState()
{
CollectionsState = collectionsState,
ContextAsString = contextAsString,
ContextTypeName = context.GetType().AssemblyQualifiedName,
KnownTypeNames = knownTypes.Select(t => t.AssemblyQualifiedName).ToList()
};
return state;
}
public static DataServiceQuery CreateQuery(this DataServiceContext context, Type elementType, string entitySetName)
{
MethodInfo method = context.GetType().GetMethod("CreateQuery");
MethodInfo generic = method.MakeGenericMethod(elementType);
DataServiceQuery query = generic.Invoke(context, new object[] { entitySetName }) as DataServiceQuery;
return(query);
}
private void ProcessForeignKeys(DataServiceContext dataServiceContext, object dataObject, IDictionary values)
{
foreach (string key in values.Keys)
{
// Check if it looks like a FK, e.g. Category.CategoryID
string[] parts = key.Split('.');
if (parts.Length != 2)
{
continue;
}
// Get the name of the entity ref property, e.g. Category
string entityRefPropertyName = parts[0];
// Create an 'empty' relaty entity, e.g a Category
PropertyInfo propInfo = dataObject.GetType().GetProperty(entityRefPropertyName);
object entityRefObject = Activator.CreateInstance(propInfo.PropertyType);
// Set the PK in the related entity, e.g. set the CategoryID in the Category
PropertyInfo subPropInfo = propInfo.PropertyType.GetProperty(parts[1]);
subPropInfo.SetValue(
entityRefObject,
Convert.ChangeType(values[key], subPropInfo.PropertyType),
null);
// Find the entity set property for the association
var entitySetProp = DataServiceUtilities.FindEntitySetProperty(
dataServiceContext.GetType(), propInfo.PropertyType);
// Attach the related entity and set it as the link on the main entity
if (entitySetProp != null)
{
dataServiceContext.AttachTo(entitySetProp.Name, entityRefObject);
dataServiceContext.SetLink(dataObject, entityRefPropertyName, entityRefObject);
}
}
}
private void ProcessForeignKeys(DataServiceContext dataServiceContext, object dataObject, IDictionary values)
{
foreach (string key in values.Keys) {
// Check if it looks like a FK, e.g. Category.CategoryID
string[] parts = key.Split('.');
if (parts.Length != 2)
continue;
// Get the name of the entity ref property, e.g. Category
string entityRefPropertyName = parts[0];
// Get the PropertyInfo for the entity ref property
PropertyInfo propInfo = dataObject.GetType().GetProperty(entityRefPropertyName);
object entityRefObject = null;
if (values[key] != null) {
// Create an 'empty' related entity, e.g a Category
entityRefObject = Activator.CreateInstance(propInfo.PropertyType);
// Set the PK in the related entity, e.g. set the CategoryID in the Category
PropertyInfo subPropInfo = propInfo.PropertyType.GetProperty(parts[1]);
subPropInfo.SetValue(
entityRefObject,
Convert.ChangeType(values[key], subPropInfo.PropertyType),
null);
}
// Find the entity set property for the association table e.g. Categories
PropertyInfo entitySetProp = DataServiceUtilities.FindEntitySetProperty(
dataServiceContext.GetType(), propInfo.PropertyType);
// Attach the related entity and set it as the link on the main entity
if (entitySetProp != null) {
if (entityRefObject != null) {
dataServiceContext.AttachTo(entitySetProp.Name, entityRefObject);
}
dataServiceContext.SetLink(dataObject, entityRefPropertyName, entityRefObject);
}
}
}
