LINQ错误无效的初始成员声明 [英] LINQ error invalid initializer member declarator

问题描述

我是一个相当初级C＃开发人员，所以原谅我，如果这是微不足道的，但我在code线下面我指出来了这个错误无效的初始成员声明。

谁能解释这是什么意思？如何解决/实现这一结果？我所有的数据注解的PODetail已经应用过一次，这就是为什么我不想在这里重复的属性也是如此。

 公共类PODetailsListViewModel：IViewModelList＆LT; PODetail，PODetailsListViewModel＆gt;中IEntity
    {
        公众诠释标识{搞定;组; }        公共字符串EntityDescription
        {
            得到
            {返回this.Id.ToString（）; }
        }        公共PODetail PODetail {搞定;组; }
        公共IEnumerable的＆LT; PODetailsListViewModel＆GT; ConvertClassToViewModel（IEnumerable的＆LT; PODetail＆GT; poDetails）
        {
            IEnumerable的＆LT; PODetailsListViewModel＆GT; contactGrid =
                从l在poDetails.ToList（）
                选择新PODetailsListViewModel（）
                {
                    ID = l.Id，
                    PODetail.POHeaderId = l.POHeaderId，＆LT; ===== ERROR在此行
                    ....
                };            返回contactGrid;
        }
 

解决方案

您不能在类初始化像访问复杂对象的属性（如你是用 PODetail.POHeaderId 属性）。您可能需要实现一个小解决方法：使用信息的匿名对象的集合，你已经有，那么重建的 PODetailsListViewModel 没错之后的具体名单：

  VAR contactGrid =由升的poDetails.ToList（）
                  选择新{
                  {
                       ID = l.Id，
                       POHeaderId = l.POHeaderId
                       ...
                  };
 

然后你就可以手动重新创建你在找什么：

  VAR someNewCollection =新名单（中PODetailsListViewModel）;
的foreach（在contactGrid VAR项）
    VAR模型=新PODetailsListViewModel（）
    {
         ID = item.Id
    };
    model.PODetail =新PODetailModel（）/ *实际的类名称替换* /
    {
        POHeaderId = item.POHeaderId
    };
    someNewCollection.Add（模型）;
}
返回someNewCollection;
 

修改：或许你可以窝在初始化：

  VAR contactGrid =由升的poDetails.ToList（）
                  选择新PODetailsListViewModel（）{
                  {
                       ID = l.Id，
                       PODetail =新PODetailModel（）
                       {
                           POHeaderId = l.POHeaderId
                       }，
                       ...
                  };
 

I'm a fairly junior C# developer so excuse me if this is trivial, but I am coming up with this error "invalid initializer member declarator" at the line of code I indicate below.

Can someone explain what this means and how do I work around/achieve this result? All of my data annotations are already applied once in PODetail, which is why I didn't want to repeat the properties here as well.

public class PODetailsListViewModel : IViewModelList<PODetail, PODetailsListViewModel>, IEntity
    {
        public int Id { get; set; }

        public string EntityDescription
        {
            get
            { return this.Id.ToString(); }
        }

        public PODetail PODetail { get; set; }


        public IEnumerable<PODetailsListViewModel> ConvertClassToViewModel(IEnumerable<PODetail> poDetails)
        {
            IEnumerable<PODetailsListViewModel> contactGrid =
                from l in poDetails.ToList()
                select new PODetailsListViewModel()
                {
                    Id = l.Id,
                    PODetail.POHeaderId = l.POHeaderId, <===== ERROR on this Line
                    ....
                };

            return contactGrid;
        }

解决方案

You can't access complex object properties in a class initializer like that (as you are attempting with the PODetail.POHeaderId property). You might have to implement a small workaround: create a collection of anonymous objects with the information you have already, then reconstruct a concrete list of PODetailsListViewModels right afterwards:

var contactGrid = from l in poDetails.ToList()
                  select new {
                  {
                       Id = l.Id,
                       POHeaderId = l.POHeaderId
                       ...
                  };

And then you can manually recreate what you're looking for:

var someNewCollection = New List(Of PODetailsListViewModel);
foreach (var item in contactGrid)
    var model = new PODetailsListViewModel()
    {
         Id = item.Id
    };
    model.PODetail = new PODetailModel() /* replace with actual class name */
    {
        POHeaderId = item.POHeaderId
    };
    someNewCollection.Add(model);
}
return someNewCollection;

EDIT: Or perhaps you could nest the initializers:

var contactGrid = from l in poDetails.ToList()
                  select new PODetailsListViewModel() {
                  {
                       Id = l.Id,
                       PODetail = new PODetailModel()
                       {
                           POHeaderId = l.POHeaderId
                       },
                       ...
                  };

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