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问题描述

我有麻烦的代码转换为扩展方法的语法:

  VAR的查询=从C在_context.Customers $ B从o在c.Orders 
$ b,其中o.DateSent == NULL
选择新CustomerSummary
{
n = c.Id,
=用户名c.Username ,
OutstandingOrderCount = c.Orders.Count
};



任何想法?


解决方案

  VAR的查询= _context.Customer 
。凡(C => c.Orders.Any(O = GT; o.DateSent == NULL) )
。选择(C =>新建CustomerSummary
{
n = c.Id,
=用户名c.Username,
OutstandingOrderCount = c.Orders.Count (O => o.DateSent == NULL)
};


I am having trouble converting this code into extension method syntax:

var query = from c in _context.Customers
                        from o in c.Orders
                        where o.DateSent == null
                        select new CustomerSummary
                        {
                            Id = c.Id,
                            Username = c.Username,
                            OutstandingOrderCount = c.Orders.Count
                        };

Any ideas?

解决方案
var query = _context.Customer
  .Where(c => c.Orders.Any(o => o.DateSent == null))
  .Select(c => new CustomerSummary
  {
    Id = c.Id,
    Username = c.Username,
    OutstandingOrderCount = c.Orders.Count(o => o.DateSent == null)
  };

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10-11 16:11