C# 使用Linq进行拆分和分组

我已经完成了下面的工作，效果很好

 public StandardReportsModel GetStandardReportsModel(string adUser, string adPassword, IPrincipal user)
 {

    var myItems = getMyItems().Where(myItem => !string.IsNullOrEmpty(myItem.Description));
    var categories = new List<string>();
    var myItems = new List<MyModel>();

    foreach (var myItem in myItems)
    {           
       var myIndex = myItem.Description.IndexOf('*');
       var category = myIndex != -1 ? myItem.Description.Substring(0, myIndex).ToUpper() : myItem.Description.ToUpper();   

       if (categories.IndexOf(category) == -1)
       {
          categories.Add(category);
       }              

       myItems.Add(getMyItem(myItem, category));
    }
    categories.Sort();      
    return new StandardModel { Categories = categories, MyItems = myItems };
 }

 private MyModel getMyItem(MyItem myItem, string category)
   {
     var categoryIdentifierIndex = myItem.Description.LastIndexOf(Delimiters.CategoryDescriptionDelimiter);
     var description = categoryIdentifierIndex != -1 ? myItem.Description.Substring(categoryIdentifierIndex + 1, (myItem.Description.Length - categoryIdentifierIndex + 1))) : myItem.Description;

     return new MyModel{ Name = myItem.Name, Description = myItem.Description, Category = category };
   }


 public class StandardModel
  {       
    public List<string> Categories { get; set; }
    public List<MyModel> MyItems { get; set; }        
  }

我想要类别和它们的项目。也许我必须在这里使用group by

请建议

字典结果=myItems
 Dictionary<string, List<MyModel>> result = myItems
         .Where(myItem => !string.IsNullOrEmpty(myItem.Description))                                    
         .Select(ci => new MyModel
           {
             Name = ci.Name,
             Category =  ci.Description.Split('*')[0],
             Description = ci.Description.Split('*')[2]
           })
         .GroupBy(e => e.Category)
         .ToDictionary(e => e.Key, e => e.ToList());

.Where（myItem=>！string.IsNullOrEmpty（myItem.Description））
.选择（ci=>new MyModel
{
Name=ci.Name，
Category=ci.Description.Split（'*'）[0]，
Description=ci.Description.Split（'*'）[2]
})
.GroupBy（e=>e.Category）
.ToDictionary（e=>e.Key，e=>e.ToList（））；

字典结果=myItems
.Where（myItem=>！string.IsNullOrEmpty（myItem.Description））
.选择（ci=>new MyModel
{
Name=ci.Name，
Category=ci.Description.Split（'*'）[0]，
Description=ci.Description.Split（'*'）[2]
})
.GroupBy（e=>e.Category）
.ToDictionary（e=>e.Key，e=>e.ToList（））；

 Dictionary<string, List<MyModel>> result = myItems
         .Where(myItem => !string.IsNullOrEmpty(myItem.Description))                                    
         .Select(ci => new MyModel
           {
             Name = ci.Name,
             Category =  ci.Description.Split('*')[0],
             Description = ci.Description.Split('*')[2]
           })
         .GroupBy(e => e.Category)
         .ToDictionary(e => e.Key, e => e.ToList());