针对给定场景使用Linq

Question

我是LINQ的新手，我的TL给了我一个要求，我可以在几秒钟内完成，因为它是一个基本的，我想要的代码转换成LINQ，请帮助我。

foreach (var item in query)
            {
                profileSearchResultEntity = new ProfileSearchResultEntity();
                profileSearchResultEntity.Id = item.ProfileId;

                if (String.IsNullOrEmpty(item.DisplayName))
                {
                    profileSearchResultEntity.Name = item.LastName + "," + " " + item.FirstName;
                }
                else
                {
                    profileSearchResultEntity.Name = item.LastName + "," + " " + item.FirstName +" "+"-"+" "+ item.DisplayName;
                }     


                lstProfileSearchResultEntity.Add(profileSearchResultEntity);
            }
            return lstProfileSearchResultEntity;

如何使用LINQ或Lambda满足此条件？

Answer 1

var lstProfileSearchResultEntity = 
    query.Select(i => new ProfileSearchResultEntity 
        {
            Id = i.Id,
            Name = i.LastName + "," + " " + i.FirstName + 
                       (string.IsNullOrEmpty(i.DisplayName) ? "" : " - " + i.DisplayName)
        }).ToList();

Answer 2

这就是它：

   return query.Select(item =>
                     {

                         var profileSearchResultEntity = new ProfileSearchResultEntity{Id = item.ProfileId};
                         if (String.IsNullOrEmpty(item.DisplayName))
                         {
                             profileSearchResultEntity.Name = item.LastName + "," + " " + item.FirstName;
                         }
                         else
                         {
                             profileSearchResultEntity.Name = item.LastName + "," + " " + item.FirstName + " " +
                                                              "-" + " " + item.DisplayName;
                         }
                         return profileSearchResultEntity;
                     });

我要展示的是，您可以编写一个函数来初始化新选择的对象。