// private Expression VisitSelect (MethodCallExpression methodCall)
// {
// List<MemberExpression> mes = MemberExpressionFinder.Find (methodCall.Arguments[1], this.tableFinder);
// if (!TryGetTable (mes))
// return methodCall;
//
// Type returnType = null;
//
// List<Tuple<string, Type>> projs = new List<Tuple<string, Type>>();
// foreach (MemberExpression me in mes)
// {
// Tuple<string, Type> column = this.tableFinder.GetColumn (me.Member);
// if (column == null)
// return methodCall;
//
// if (returnType == null)
// returnType = column.Item2;
// if (returnType != column.Item2)
// return methodCall;
//
// projs.Add (column);
// }
//
// ReturnType = returnType;
// this.fallback = true;
//
// (this.projections ?? (this.projections = new List<Tuple<string, Type>>()))
// .AddRange (projs);
//
// return methodCall.Arguments[0];
// }
private Expression VisitSelectMany(MethodCallExpression methodCall)
{
List <MemberExpression> mes = MemberExpressionFinder.Find(methodCall, tableFinder);
if (mes.Count > 1)
{
fallback = true;
return(methodCall);
}
if (!TryGetTable(mes))
{
return(methodCall);
}
ContentResolverColumnMapping column = tableFinder.GetColumn(mes[0].Member);
if (column == null || column.ReturnType.GetGenericTypeDefinition() != typeof(IEnumerable <>))
{
fallback = true;
return(methodCall);
}
ReturnType = column.ReturnType.GetGenericArguments()[0];
return(Expression.Constant(
Activator.CreateInstance(typeof(Query <>).MakeGenericType(ReturnType), provider)));
//return methodCall.Arguments[0];
}
internal static List<MemberExpression> Find (Expression expression, ITableFinder tableFinder)
{
if (expression == null)
throw new ArgumentNullException ("expression");
if (tableFinder == null)
throw new ArgumentNullException ("tableFinder");
var finder = new MemberExpressionFinder (tableFinder);
finder.Visit (expression);
return finder.expressions;
}
internal static List <MemberExpression> Find(Expression expression, ITableFinder tableFinder)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
if (tableFinder == null)
{
throw new ArgumentNullException("tableFinder");
}
var finder = new MemberExpressionFinder(tableFinder);
finder.Visit(expression);
return(finder.expressions);
}
