c# - 等效于“Into”的 Linq 方法

Question

我确实有一个 LINQ 查询：

var groupedResult = from address in Address.GetAddresses()
                      group new { City = address.City, HasManyInhabitants = address.Inhabitants > 20 } 
                      by address.City into addressWithInfo
                      select addressWithInfo;

这很好用。但我正在寻找这个查询的方法基础方法。目前我使用

var groupedResult = Address.GetAddresses()
                  .Select(a => new { City = a.City, HasManyInhabitants = a.Inhabitants > 20 })
                  .GroupBy(a => a.City)
                  .Select(a => a);

它有效，但似乎不正确，因为反编译的代码（使用 ILSpy）看起来不相似。

问候，托斯滕

标签： c#linq

Answer 1

你只想要这个：

var groupedResult =
    Address
        .GetAddresses()
        .GroupBy(
            address => address.City,
            address => new
            {
                City = address.City,
                HasManyInhabitants = address.Inhabitants > 20
            });