下面的程序生成排列有什么问题？

Question

 var query = from p1 in Enumerable.Range(2,3)
                        from p2 in Enumerable.Range(4,5)                       
                        select new { p1 , p2}; 

结果似乎是错误的

{ p1 = 2, p2 = 4 }
{ p1 = 2, p2 = 5 }
{ p1 = 2, p2 = 6 }
{ p1 = 2, p2 = 7 }
{ p1 = 2, p2 = 8 }
{ p1 = 3, p2 = 4 }
{ p1 = 3, p2 = 5 }
{ p1 = 3, p2 = 6 }
{ p1 = 3, p2 = 7 }
{ p1 = 3, p2 = 8 }
{ p1 = 4, p2 = 4 }
{ p1 = 4, p2 = 5 }
{ p1 = 4, p2 = 6 }
{ p1 = 4, p2 = 7 }
{ p1 = 4, p2 = 8 }

需要帮助

Answer 1

我想猜你希望结果是{2,4}，{2,5}，{3,4}，{3,5}。如果是这种情况，也许您错过了Enumerable.Range的第二个参数不是上限 - 它是一个长度。在这种情况下，你想要：

var query = from p1 in Enumerable.Range(2, 2)
            from p2 in Enumerable.Range(4, 2)
            select new { p1 , p2};