c# - 我如何重写它以使其更加 LINQy？

Question

我这里有这组数据。事件有一个属性 EventGroups其类型为List<Groups>

List<Events> e;
List<Groups> g;

// Get the data from the database using dapper
using( var con = DataAccessMaster.GetOpenConnection( ) ) {
    using( var multi = con.QueryMultiple( sprocname, new { StartDate = fromDate, EndDate = toDate }, commandType:CommandType.StoredProcedure ) ) {
        e = multi.Read<Events>( ).ToList( );
        g = multi.Read<Groups>().ToList();
    }
}

// Only put the groups that belong to one another within the related event so that when we goto bind it will be painless
foreach ( var ev in e ) {
    ev.EventGroups = new List<Groups>();
    foreach ( Groups group in g.Where( Groups => ( ev.EventID == Groups.EventID ) ) ) {
        ev.EventGroups.Add( group );
    }
}

return e;

我觉得最后一个 block 可以重写得比现在更干净。我该怎么做才能使它更干净？

Answer 1

您可以使用Enumerable.ToList Extension Method将 IEnumerable 转换为新的 List :

foreach (var ev in e)
{
    ev.EventGroups = g.Where(groups => ev.EventID == groups.EventID)
                      .ToList();
}