如何在LINQ select中访问循环索引？

这段代码：

var customers = from cust in Customers group cust by new {cust.Country} into grouping select new { Country = grouping.Key.Country, Customers = grouping }; customers.ToList().ForEach(g => Console.WriteLine("{0} has {1} customers: {2}", g.Country, g.Customers.Count(), String.Join(", ",g.Customers.Select(x => "#. " + x.CompanyName).ToArray()) )); customers.Dump(); 

产生这些结果：

 Argentina has 3 customers: #. Cactus Comidas para llevar, #. Océano Atlántico Ltda., #. Rancho grande Austria has 2 customers: #. Ernst Handel, #. Piccolo und mehr Belgium has 2 customers: #. Maison Dewey, #. Suprêmes délices Brazil has 9 customers: #. Comércio Mineiro, #. Familia Arquibaldo, #. Gourmet Lanchonetes, #. Hanari Carnes, #. Que Delícia, #. Queen Cozinha, #. Ricardo Adocicados, #. Tradição Hipermercados, #. Wellington Importadora Canada has 3 customers: #. Bottom-Dollar Markets, #. Laughing Bacchus Wine Cellars, #. Mère Paillarde Denmark has 2 customers: #. Simons bistro, #. Vaffeljernet ... 

如何用索引/计数替换“＃”，以便得到如下结果：

 Argentina has 3 customers: 1. Cactus Comidas para llevar, 2. Océano Atlántico Ltda., 3. Rancho grande ... 

Answer 1

 customers.ToList().ForEach(g => Console.WriteLine("{0} has {1} customers: {2}", g.Country, g.Customers.Count(), string.Join(", ", g.Customers.Select((x, i) => i + ". " + x.CompanyName).ToArray()))); 

Answer 2

尝试制作一个int x = 0; 你的linq声明之前。 然后，在其中，print（x ++）。ToString（）。

这将使xa闭包。

Answer 3

你可以这样做，以搜索迭代器索引值：

 var customers = from cust in Customers //Get Current Index let currIndex = Customers.IndexOf(cust) //You can then make use of the index in the Variable currIndex