protected override Expression VisitConstant(ConstantExpression node)
{
if (node.Value is OeEnumerableStub enumerableStub)
{
IQueryable query = null;
if (_queryableSource != null)
{
query = _queryableSource(enumerableStub.EntitySet);
if (query != null && query.Expression is MethodCallExpression)
{
return(query.Expression);
}
}
if (query == null)
{
Db.OeEntitySetAdapter entitySetAdapter = _edmModel.GetEntitySetAdapter(enumerableStub.EntitySet);
query = entitySetAdapter.GetEntitySet(_dataContext);
}
return(Expression.Constant(query));
}
return(node);
}
protected override Expression VisitConstant(ConstantExpression node)
{
if (node.Value is OeEnumerableStub enumerableStub)
{
IQueryable?query = null;
if (_queryableSource != null)
{
query = _queryableSource(enumerableStub.EntitySet);
if (query != null && query.Expression is MethodCallExpression)
{
return(query.Expression);
}
}
if (query == null)
{
if (_dataContext == null)
{
throw new InvalidOperationException("If function queryableSource return null dataContext must be not null");
}
Db.OeEntitySetAdapter entitySetAdapter = _edmModel.GetEntitySetAdapter(enumerableStub.EntitySet);
query = entitySetAdapter.GetEntitySet(_dataContext);
}
return(query.Expression);
}
return(node);
}
protected override Expression VisitConstant(ConstantExpression node)
{
if (node.Type.IsGenericType && (node.Type.GetGenericTypeDefinition() == typeof(IEnumerable <>) || node.Type.GetGenericTypeDefinition() == typeof(IQueryable <>)))
{
Db.OeEntitySetAdapter entitySetAdapter = _entitySetAdapters.FindByClrType(node.Type.GetGenericArguments()[0]);
IQueryable query = entitySetAdapter.GetEntitySet(_dataContext);
return(Expression.Constant(query));
}
return(base.VisitConstant(node));
}
private ConstantExpression GetQueryConstantExpression(Expression node)
{
if (node.Type.IsGenericType && node.Type.GetGenericTypeDefinition() == typeof(IQueryable <>))
{
Db.OeEntitySetAdapter entitySetAdapter = _entitySetAdapters.FindByClrType(node.Type.GetGenericArguments()[0]);
IQueryable query = entitySetAdapter.GetEntitySet(_dataContext);
if (_query == null && entitySetAdapter.EntityType == typeof(T))
{
_query = (IQueryable <T>)query;
}
return(Expression.Constant(query));
}
return(null);
}