static internal Dictionary<string, Meta> GatherMetadata(Expression expression)
{
if (expression == null)
throw new ArgumentException("expression");
if (!typeof(IQueryable).IsAssignableFrom(expression.Type))
throw new InvalidOperationException("Expression type is not IQueryable");
Expression simplified = MetaEvaluator.Clean(expression);
MetaProjectorExpression meta = new MetadataVisitor().Visit(simplified) as MetaProjectorExpression;
if (meta == null)
return null;
var proj = meta.Projector;
if (proj.NodeType != ExpressionType.New && //anonymous types
proj.NodeType != ExpressionType.MemberInit && // not-anonymous type
!(proj.NodeType == (ExpressionType)MetaExpressionType.MetaExpression && ((MetaExpression)proj).IsEntity)) // raw-entity!
return null;
PropertyInfo[] props = proj.Type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
return props.ToDictionary(pi => pi.Name, pi =>
{
Expression ex = BindMember(proj, pi, pi.PropertyType);
return (ex as MetaExpression).Try(c => c.Meta);
});
}
static internal Dictionary <string, Meta> GatherMetadata(Expression expression)
{
if (expression == null)
{
throw new ArgumentException("expression");
}
if (!typeof(IQueryable).IsAssignableFrom(expression.Type))
{
throw new InvalidOperationException("Expression type is not IQueryable");
}
Expression simplified = MetaEvaluator.Clean(expression);
MetaProjectorExpression meta = new MetadataVisitor().Visit(simplified) as MetaProjectorExpression;
if (meta == null)
{
return(null);
}
var proj = meta.Projector;
if (proj.NodeType != ExpressionType.New && //anonymous types
proj.NodeType != ExpressionType.MemberInit && // not-anonymous type
!(proj is MetaExpression && ((MetaExpression)proj).IsEntity)) // raw-entity!
{
return(null);
}
PropertyInfo[] props = proj.Type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
return(props.ToDictionary(pi => pi.Name, pi =>
{
Expression ex = BindMember(proj, pi, pi.PropertyType);
return (ex as MetaExpression)?.Meta;
}));
}