public T Add <T>(T entity) where T : class
{
try
{
return(_repository.Add(entity));
}
finally
{
var id = _metaData.GetPrimaryKeyValue <T>(entity);
var key = CacheKey <T>("GetById", new[] { new { Name = "id", Value = ConvertId(id) } }, false);
_delayedCache.Add(() =>
{
SetWriteThroughCache(key, entity);
NextGeneration <T>();
});
}
}
public static Expression <Func <T, bool> > BuildPrimaryKeyExpression <T>(this IMetaDataProvider repository, T entity)
where T : class
{
var primaryKeyValue = repository.GetPrimaryKeyValue(entity).First();
var primaryKey = repository.GetPrimaryKey <T>().First();
var parameter = Expression.Parameter(typeof(T));
var body = Expression.Convert(Expression.PropertyOrField(parameter, primaryKey), typeof(object));
var idSelector = Expression.Lambda <Func <T, object> >(body, parameter);
var predicate = idSelector.BuildOrExpression(new[] { primaryKeyValue });
return(predicate);
}
public static Expression <Func <T, bool> > BuildPrimaryKeyExpression <T>(this IMetaDataProvider repository, T entity)
where T : class
{
var primaryKeyValue = repository.GetPrimaryKeyValue(entity);
var primaryKey = repository.GetPrimaryKey <T>();
var values = primaryKey.Zip(primaryKeyValue, Tuple.Create).ToArray();
Expression <Func <T, bool> > predicate = null;
foreach (var value in values)
{
var parameter = Expression.Parameter(typeof(T));
var left = Expression.Convert(Expression.PropertyOrField(parameter, value.Item1), value.Item2.GetType());
var body = Expression.Equal(left, Expression.Constant(value.Item2));
predicate = predicate == null?Expression.Lambda <Func <T, bool> >(body, parameter) : predicate.And(Expression.Lambda <Func <T, bool> >(body, parameter));
}
return((Expression <Func <T, bool> >)Evaluator.PartialEval(predicate));
}