public static IQueryable <T> OrderByField <T>(this IQueryable <T> source, string fieldName)
{
PropertyInfo pi = typeof(T).GetProperty(fieldName);
var mInfo = typeof(Queryable).GetMethods().Where(mi => mi.Name == "OrderBy" && mi.GetParameters().Length == 2).Single();
var mInfoGen = mInfo.MakeGenericMethod(typeof(T), pi.PropertyType);
return((IQueryable <T>)mInfoGen.Invoke(null, new object[] {
source,
LinqX.GetFieldSelector <T>(fieldName)
}));
}
/// <summary>
/// Update an entity in a context, taking appropriate action based on
/// whether it is already tracked or not
/// </summary>
/// <param name="context">The database context</param>
/// <param name="entity">The entity to update in the context</param>
public static void SafeUpdate(this DbContext context, object entity)
{
var entry = context.Entry(entity);
if (entry.State != EntityState.Detached)
{
return;
}
Type entityType = entity.GetType().ContentType();
object id = LinqX.GetIdProp(entity.GetType(), null).GetValue(entity);
var attachedEntity = context.Set(entityType).Find(id);
if (attachedEntity != null)
{
context.Entry(attachedEntity).CurrentValues.SetValues(entity);
}
else
{
entry.State = EntityState.Modified;
}
}