private static void CalculateNullableAverage(RewriteDesign design, TypeBridge elementType, TypedValueBridge selectionValue, LocalVariable sumVariable)
{
var inlinedValue = selectionValue.Reusable(design);
design.ForAdd(If(inlinedValue.IsEqual(null), Continue()));
design.ForAdd(sumVariable.AddAssign(inlinedValue.Cast(elementType)));
design.Indexer = null;
if (design.Unchecked)
{
design.ResultAdd(sumVariable.Cast(design.ReturnType.Type) / design.Indexer);
}
else
{
design.ResultAdd(Return(SyntaxFactory.ConditionalExpression(design.Indexer.IsEqual(0),
Null, sumVariable.Cast(design.ReturnType.Type) / design.Indexer)));
}
}