检查列表中数组的大小，并将数组中的每个实体显示为唯一的列表值

Question

我想知道是否有人可以帮助我，基本上我正在尝试使用 linq 来展平列表。列表内部是一个 phone 数字数组，我想不通的是计算数组的大小并将每个 phone 数字添加为唯一列表值。

var FlatenedList = from x in result
where x.ID != null
orderby x.ID

select new
   {
    AccountNumber = x.AccountNumber,
    Balance = x.Balance,
    BillToCompanyName = x.BillToContact.CompanyName,
    BillToName = x.BillToContact.Name,

    BillToPhoneNumber1 = x.BillToContact.PhoneNumbers[0].Number == null ? String.Empty : (x.BillToContact.PhoneNumbers[0].Number),
    BillToPhoneNumber2 = x.BillToContact.PhoneNumbers[1].Number == null ? String.Empty : (x.BillToContact.PhoneNumbers[1].Number),
    BillToPhoneNumber3 = x.BillToContact.PhoneNumbers[2].Number == null ? String.Empty : (x.BillToContact.PhoneNumbers[2].Number),       
    };

Answer 1

也许你应该尝试像下面这样的东西，我还没有编译它，但这可能有用

var FlatenedList = from x in result
where x.ID != null
orderby x.ID

select new
   {
    AccountNumber = x.AccountNumber,
    Balance = x.Balance,
    BillToCompanyName = x.BillToContact.CompanyName,
    BillToName = x.BillToContact.Name,

    BillToPhoneNumber = x.BillToContact.PhoneNumbers.ToList().Where(num=>num.Number !=null).Select(num=>num) 
    };

Answer 2

我想你需要一个 Expand Object。

以下是您可以为一件商品执行此操作的方法：

var FlattenedItem = new ExpandoObject();

for(int i = 0; i < x.BillToContact.PhoneNumbers.length; i++) {
    // You will have to cast FlattenedItem to an IDictionary to add items
    ((IDictionary<string, object>)FlattenedItem).Add("BillToPhoneNumber" + i, x.BillToContact.PhoneNumbers[i]);
}

// This is your first phonenumber
var firstPhoneNumber = FlattenedItem.BillToPhoneNumber0;

查看此答案以获取更多信息： Creating an anonymous type dynamically?

Answer 3

如果我没理解错的话，这就是你需要的：-

var result = accounts.OrderBy(x => x.Id)
              .Select(x => new 
                {
                   AccountNumber = x.AccountNumber,
                   Balance = x.Balance,
                   BillToCompanyName = x.BillToContact.CompanyName,
                   BillToName = x.BillToContact.Name,
                   PhoneNumbersCount = x.BillToContact.PhoneNumbers.Count(),  
                                         //All phone numbers count including null
                   PhoneNumbersList = x.BillToContact.PhoneNumbers
                                       .Select(z => z.Number ?? String.Empty).ToList()
                });

你可以查看这个 Fiddle 我使用了一些样本数据的地方，如果这就是你要找的，请告诉我。

检查列表中数组的大小，并将数组中的每个实体显示为唯一的列表值

Check the size of an array inside a list and show each entity in the array as a unique list value

c#

linq

arrays

list