private Expression GetCheckedValueOrNull(Expression value, Expression keyedAccess, IMemberMapperData mapperData)
{
if (HasSimpleEntries)
{
return(null);
}
if ((value.NodeType != Block) && (value.NodeType != Try) || mapperData.TargetIsDefinitelyUnpopulated())
{
return(mapperData.SourceMember.IsEnumerable ? value.GetConversionTo(ValueType) : null);
}
var checkedAccess = GetAccessChecked(mapperData);
var existingValue = checkedAccess.Variables.First();
if (value.NodeType == Try)
{
return(GetCheckedTryCatch((TryExpression)value, keyedAccess, checkedAccess, existingValue));
}
var checkedValue = ((BlockExpression)value).Replace(keyedAccess, existingValue);
return(checkedValue.Update(
checkedValue.Variables.Append(existingValue),
checkedValue.Expressions.Prepend(checkedAccess.Expressions.First())));
}
private static Expression GetTargetValidCheckOrNull(Type targetType, IMemberMapperData mapperData)
{
if (!mapperData.TargetMember.IsReadable || mapperData.TargetIsDefinitelyUnpopulated())
{
return(null);
}
var targetIsOfDerivedType = GetTargetIsDerivedTypeCheck(targetType, mapperData);
if (mapperData.TargetIsDefinitelyPopulated())
{
return(targetIsOfDerivedType);
}
var targetIsNull = mapperData.TargetObject.GetIsDefaultComparison();
var targetIsValid = Expression.OrElse(targetIsNull, targetIsOfDerivedType);
return(targetIsValid);
}