private static LambdaExpression ComposeWithInlining(IReadOnlyList <LambdaExpression> projections, int indexToMerge)
{
var currentProjection = projections[indexToMerge];
if (indexToMerge == 0)
{
return(currentProjection);
}
// construct the merger of all previous projections
var previousProjection = ComposeWithInlining(projections, indexToMerge - 1);
Throw.If(!currentProjection.Parameters[0].Type.IsAssignableFrom(previousProjection.ReturnType), "projections: cannot be chained due to type mismatch");
// merge the current with the previous by inlining
var replacer = new ParameterReplacer(currentProjection.Parameters[0], previousProjection.Body);
var inlinedBody = replacer.Visit(currentProjection.Body);
return(Expression.Lambda(inlinedBody, previousProjection.Parameters));
}
private static LambdaExpression ComposeWithInlining(IReadOnlyList<LambdaExpression> projections, int indexToMerge)
{
var currentProjection = projections[indexToMerge];
if (indexToMerge == 0)
{
return currentProjection;
}
// construct the merger of all previous projections
var previousProjection = ComposeWithInlining(projections, indexToMerge - 1);
Throw.If(!currentProjection.Parameters[0].Type.IsAssignableFrom(previousProjection.ReturnType), "projections: cannot be chained due to type mismatch");
// merge the current with the previous by inlining
var replacer = new ParameterReplacer(currentProjection.Parameters[0], previousProjection.Body);
var inlinedBody = replacer.Visit(currentProjection.Body);
return Expression.Lambda(inlinedBody, previousProjection.Parameters);
}