protected override Expression VisitMarker(MarkerExpression expression)
{
var target = Visit(expression.Target);
return(target == expression.Target
? expression
: new MarkerExpression(target, expression.MarkerType));
}
protected virtual Expression VisitMarker(MarkerExpression expression)
{
var processedTarget = Visit(expression.Target);
if (processedTarget == expression.Target)
{
return(expression);
}
return(new MarkerExpression(processedTarget, expression.MarkerType));
}
protected override Expression VisitMarker(MarkerExpression expression)
{
var target = expression.Target;
var processedTarget = Visit(target);
if (expression.MarkerType != MarkerType.None && (expression.MarkerType & MarkerType.Default) == MarkerType.None)
{
if (itemMaterializationContextParameter == null)
{
return(processedTarget);
}
var columns = ColumnGatherer.GetColumns(target, ColumnExtractionModes.Distinct | ColumnExtractionModes.Ordered).ToArray();
var sequenceCheck = Expression.Call(MaterializationHelper.IsNullMethodInfo, tupleParameter, Expression.Constant(columns));
var throwException = Expression.Convert(Expression.Call(MaterializationHelper.ThrowEmptySequenceExceptionMethodInfo), target.Type);
return(Expression.Condition(sequenceCheck, throwException, processedTarget));
}
return(processedTarget);
}
protected override Expression VisitMarker(MarkerExpression expression)
{
Visit(expression.Target);
return(expression);
}
