public static EntityKey CreateKeyFromForeignKeyValues(
EntityEntry dependentEntry,
ReferentialConstraint constraint,
EntitySet principalEntitySet,
bool useOriginalValues)
{
ReadOnlyMetadataCollection <EdmProperty> toProperties = constraint.ToProperties;
int count = toProperties.Count;
if (count == 1)
{
object singletonKeyValue = useOriginalValues ? dependentEntry.GetOriginalEntityValue(toProperties.First <EdmProperty>().Name) : dependentEntry.GetCurrentEntityValue(toProperties.First <EdmProperty>().Name);
if (singletonKeyValue != DBNull.Value)
{
return(new EntityKey((EntitySetBase)principalEntitySet, singletonKeyValue));
}
return((EntityKey)null);
}
string[] keyMemberNames = principalEntitySet.ElementType.KeyMemberNames;
object[] compositeKeyValues = new object[count];
ReadOnlyMetadataCollection <EdmProperty> fromProperties = constraint.FromProperties;
for (int index1 = 0; index1 < count; ++index1)
{
object obj = useOriginalValues ? dependentEntry.GetOriginalEntityValue(toProperties[index1].Name) : dependentEntry.GetCurrentEntityValue(toProperties[index1].Name);
if (obj == DBNull.Value)
{
return((EntityKey)null);
}
int index2 = Array.IndexOf <string>(keyMemberNames, fromProperties[index1].Name);
compositeKeyValues[index2] = obj;
}
return(new EntityKey((EntitySetBase)principalEntitySet, compositeKeyValues));
}
private static string GetTableNameByClrName(ReadOnlyMetadataCollection<EntitySet> EntitySets,string tablename)
{
return EntitySets.First(x=>x.Name == tablename).Table;
}