list 使用 Linq 获取列表中对象的索引
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Get index of object in a list using Linq
提问by RookieAppler
I am new to Linq. I have a Customers table.ID,FullName,Organization,Location being the columns. I have a query in Sqlite returning me 2500 records of customers. I have to find the index of the customer where ID=150 for example from this result set. Its a List of Customers. The result set of the query is ordered by organization. I tried with FindIndex and IndexOf but getting errors for the former and -1 for the latter. So, how should it be done? Thanks.
我是 Linq 的新手。我有一个客户表。ID,FullName,Organization,Location 作为列。我在 Sqlite 中有一个查询，返回了 2500 条客户记录。例如，我必须从这个结果集中找到 ID=150 的客户索引。它的客户名单。查询的结果集按组织排序。我尝试使用 FindIndex 和 IndexOf 但前者出错，后者出错 -1。那么，应该怎么做呢？谢谢。
回答by Tim Schmelter
回答by Sergey Berezovskiy
Linq to Objects has overloaded Selectmethod
Linq to Objects 重载了Select方法
customers.Select((c,i) => new { Customer = c, Index = i })
.Where(x => x.Customer.ID == 150)
.Select(x => x.Index);
Keep in mind, that you should have in-memory List<Customer>to use this Linq to Objects method.
请记住，您应该在内存List<Customer>中使用此 Linq to Objects 方法。
