internal bool ExtractLookupColumns(IDictionary <string, object> lookupColumns)
{
switch (_operator)
{
case ExpressionType.And:
var ok = _left.ExtractLookupColumns(lookupColumns);
if (ok)
{
ok = _right.ExtractLookupColumns(lookupColumns);
}
return(ok);
case ExpressionType.Equal:
var expr = IsValueConversion ? this : _left;
while (expr.IsValueConversion)
{
expr = expr.Value as ODataExpression;
}
if (!string.IsNullOrEmpty(expr.Reference))
{
if (expr.Reference.IndexOfAny(_propertySeperator) >= 0)
{
//skip child entity - may result in false positives
return(false);
}
var key = expr.Reference;
if (key != null && !lookupColumns.ContainsKey(key))
{
lookupColumns.Add(key, _right);
}
}
return(true);
default:
if (IsValueConversion)
{
return((Value as ODataExpression).ExtractLookupColumns(lookupColumns));
}
else
{
return(false);
}
}
}