Question

我有以下课程：

public class ProviderQualification
{
    public List<ProviderDetail> ProviderDetails { get; set; }
}
public class ProviderDetail
{
    public string ProviderName { get; set; }
    public string ServiceableOffers { get; set; }
}
public class ProviderQualificationTimeViewModel
{
    public List<ProviderQualificationDetail> ProviderQualificationDetails { get; set; }
}
public class ProviderQualificationDetail
{
    public string ProviderName { get; set; }
    public string TotalServiceableOffers { get; set; }
}

我填充了ProviderQualification的{{1}}个对象。

List<ProviderDetail>

现在我想将此列表复制到我的ProviderQualification providerQualification = reporting.GetProviderQualification();。我该怎么做？

Answer 1

使用Linq：

List<ProviderQualificationDetail> result = 
         providerQualification.ProviderDetails.Select(
                         q => new ProviderQualificationDetail() 
                                   { 
                                       ProviderName  = q.ProviderName, 
                                       TotalServiceableOffers = q.ServiceableOffers 
                                   }).ToList();

使用Select将ProviderDetails中的每个元素投影到ProviderQualificationDetail类型的新元素中，然后将其枚举为List。

Answer 2

您需要映射才能从ProviderDetail转到ProviderQualificationDetail。例如，如果您只想复制这些值，则可以像这样内联写入：

ProviderQualification providerQualification = reporting.GetProviderQualification();

var items = providerQualification.ProviderDetails
            .Select(detail => new ProviderQualificationDetail
                {
                    ProviderName = detail.ProviderName,
                    TotalServiceableOffers = detail.ServiceableOffers
                })
            .ToList();

var viewModel = new ProviderQualificationTimeViewModel
{
    ProviderQualificationDetails = items
};

Answer 3

您可以使用

Enumerable.Select＆LT; TSource，TResult＆gt;方法（IEnumerable＆lt; TSource＆gt;，Func＆lt; TSource，TResult＆gt;）

例如

List<ProviderQualificationDetail> list = 
providerQualification.ProviderDetails
.Select(x => new ProviderQualificationDetail(){
    ProviderName = x.ProviderName,
    TotalServiceableOffers = x.ServiceableOffers
}).ToList();

Answer 4

在我看来，@ zaria想要选择不同的ProviderName和总ServiceableOffers。如果她有ProviderQualification课程，为什么要绑定到ProviderQualificationDetail？

 List<ProviderQualificationDetail> list=providerQualification.ProviderDetails.GroupBy(x => x.ProviderName)
                                          .Select(x=>new ProviderQualificationDetail{
                                                   ProviderName =x.Key,
                                                   TotalServiceableOffers=Sum(y=>y.ServiceableOffers) 
                                           }).ToList();

将List对象分配给c＃中的另一个List

4 个答案: