Question

在没有foreach的情况下，有没有更好的方法来编写此代码？我想从类型为int的IEnumerable中添加项目（管辖区），并将其转换为包含属性Ref的IList，应在此处进行设置。

public class TrackDataFilter
{
    public TrackDataFilter(IEnumerable<int> firmRef, int? superSectorRef, DateTime from, DateTime to, int userFirmRef) : this()
    {
        Firms = firmRef.Select(x => new TrackFilterGenericRef { Ref = x, Type = ContentTypes.Firm, Description = "" });
        SuperSectorRef = superSectorRef;
        From = from;
        To = to;
        UserFirmRef = userFirmRef;
    }

    public TrackDataFilter()
    {
        Workareas = new List<TrackFilterGenericRef>();
        Jurisdictions = new List<TrackFilterGenericRef>();
        Tags = new List<TrackFilterGenericRef>();
        Firms = Enumerable.Empty<TrackFilterGenericRef>();
    }

    public IList<TrackFilterGenericRef> Jurisdictions { get; set; } 
    ...
}   

public class TaxiBriefingFilter
{

    public IEnumerable<int> Jurisdictions { get; set; }
    ...
}

// add items in IEnumerable<int> Jurisdictions into IList<TrackFilterGenericRef>

var filter = new TaxiBriefingFilter();

var dataFilter = new TrackDataFilter(new int[] { companyId }, null, from, to, userFirmRef);

foreach (var jurisdictionRef in filter.Jurisdictions)
{
    dataFilter.Jurisdictions.Add(new TrackFilterGenericRef { Ref = jurisdictionRef});
}

var jurisdictions = trackAnalyticsService.GetJurisdictions(dataFilter, maxJurisdictions);
...

Answer 1

您可以使用LINQ表达相同的逻辑，但是在这种情况下，我认为它不容易阅读。性能应该差不多。

using System.Linq;
...
var filter = new TaxiBriefingFilter();
var dataFilter = new TrackDataFilter(new int[] { companyId }, null, from, to, userFirmRef);
dataFilter.Jurisdictions.AddRange(
    filter.Jurisdictions.Select(jref => new TrackFilterGenericRef { Ref = jref }));

Answer 2

你是说

using System.Linq;
...
Jurisdictions = Firms.ToList();

或

Jurisdictions = firmRef.Select(x => new TrackFilterGenericRef { Ref = x, Type = ContentTypes.Firm, Description = "" }).ToList();

？

在第一个示例中，您将获得一个列表，该列表具有与Firms枚举中相同的实例。在第二秒中，您将在Jurisdictions列表中获得一个包含新实例的列表。

在C＃中转换类型

2 个答案: