private Expression VisitProjection(ProjectionExpression projection, MaterializerBuildingExpressionVisitor visitor)
{
switch (projection)
{
case ServerProjectionExpression serverProjectionExpression:
{
return(visitor.Visit(serverProjectionExpression.ResultLambda.Body));
}
case ClientProjectionExpression clientProjectionExpression:
{
var server = clientProjectionExpression.ServerProjection;
var result = clientProjectionExpression.ResultLambda;
return(Expression.Invoke(result, VisitProjection(server, visitor)));
}
case CompositeProjectionExpression compositeProjectionExpression:
{
var outer = VisitProjection(compositeProjectionExpression.OuterProjection, visitor);
var inner = VisitProjection(compositeProjectionExpression.InnerProjection, visitor);
var result = compositeProjectionExpression.ResultLambda;
return(Expression.Invoke(result, outer, inner));
}
default:
{
throw new InvalidOperationException();
}
}
}
public override Expression Visit(Expression node)
{
switch (node)
{
case SelectExpression selectExpression:
{
var readerParameter
= Expression.Parameter(typeof(DbDataReader), "dbDataReader");
var visitor
= new MaterializerBuildingExpressionVisitor(
translatabilityAnalyzingExpressionVisitor,
readValueExpressionFactoryProvider.GetReadValueExpressionFactories(),
readerParameter);
var body = VisitProjection(selectExpression.Projection, visitor);
return(Expression.Lambda(body, "MaterializeResult", new[] { readerParameter }));
}
default:
{
return(base.Visit(node));
}
}
}
