static Delegate CreateMapFunc(Type typeT, IReadOnlyCollection <Column> columns)
{
Contract.Requires(columns != null);
Contract.Requires(typeT != null);
Contract.Ensures(Contract.Result <Delegate>() != null);
if (typeT.IsPrimitiveOrEnum() || typeT.IsNullable() ||
typeT == typeof(string) || typeT == typeof(Guid) || typeT == typeof(DateTime) || typeT == typeof(DateTimeOffset) ||
(typeT.IsClass == false && typeT.Name.Contains("Id")) && typeT.Namespace.Contains("BusterWood")) // special case for Id, IntId, LongId and GuidId structs
{
return(CreatePrimativeMapFunc(typeT, columns));
}
MappingResult <Thing, Thing> result = Mapping.CreateFromSource(columns.Cast <Thing>().ToList(), Types.WriteablePublicThings(typeT), typeT.Name);
if (result.Mapped.Count == 0)
{
throw new InvalidOperationException("No columns were mapped to type " + typeT);
}
var readerParam = Expression.Parameter(typeof(DbDataReader), "reader");
var resultParam = Expression.Parameter(typeT, "result");
var block = CreateMapBlock(typeT, result.Mapped, readerParam, resultParam);
var func = typeof(Func <,>).MakeGenericType(new[] { typeof(DbDataReader), typeT });
return(Expression.Lambda(func, block, new[] { readerParam }).Compile());
}