public TResult Execute <TResult>(Expression expression)
{
if (expression.NodeType == ExpressionType.Constant || !(expression is MethodCallExpression))
{
return((TResult)DataProvider.GetItems(Set));
}
var whereFinder = new InnermostWhereFinder();
var whereExpression = whereFinder.GetInnermostWhere(expression);
var lambdaExpression = (LambdaExpression)((UnaryExpression)(whereExpression.Arguments[1])).Operand;
return(default(TResult));
}
internal static object Execute(Expression expression, bool IsEnumerable)
{
if (!IsQueryOverDataSource(expression))
{
throw new InvalidProgramException("No query over the data source was specified.");
}
//// Find the call to Where() and get the lambda expression predicate.
InnermostWhereFinder whereFinder = new InnermostWhereFinder();
MethodCallExpression whereExpression = whereFinder.GetInnermostWhere(expression);
LambdaExpression lambdaExpression = (LambdaExpression)((UnaryExpression)(whereExpression.Arguments[1])).Operand;
// Send the lambda expression through the partial evaluator.
lambdaExpression = (LambdaExpression)Evaluator.PartialEval(lambdaExpression);
//// Get the place name(s) to query the Web service with.
//LocationFinder lf = new LocationFinder(lambdaExpression.Body);
//List<string> locations = lf.Locations;
//if (locations.Count == 0)
// throw new InvalidQueryException("You must specify at least one place name in your query.");
//// Call the Web service and get the results.
//Place[] places = WebServiceHelper.GetPlacesFromTerraServer(locations);
//// Copy the IEnumerable places to an IQueryable.
//IQueryable<JObject> queryablePlaces = places.AsQueryable<JObject>();
//// Copy the expression tree that was passed in, changing only the first
//// argument of the innermost MethodCallExpression.
//ExpressionTreeModifier treeCopier = new ExpressionTreeModifier(queryablePlaces);
//Expression newExpressionTree = treeCopier.Visit(expression);
//// This step creates an IQueryable that executes by replacing Queryable methods with Enumerable methods.
//if (IsEnumerable)
// return queryablePlaces.Provider.CreateQuery(newExpressionTree);
//else
// return queryablePlaces.Provider.Execute(newExpressionTree);
return(null);
}