单个列表需要在c＃记录中交叉连接 [英] Single list need cross join in c# records

问题描述

我有 1 列表的记录列表中有一些我需要合并的记录子列表，两个列表记录<在通用列表中的span class =code-keyword>。 
 
 
任何人帮助我.... 
 
 
 
示例
 
 LIST  1  A1，A2，A3，A4 LIST  2  B1，B2，B3，B4 
 
需要输出如
 A1 B1 
 A1 B2 
 A1 B3 
 A1 B4 
 A2 b1 
 A2 B2 
。 
。 
。 
 
 
 
就像我需要的那样

我尝试过：

  foreach （GroupRouting objGroupRouting  in  objlstGroupRouting）
 {
  foreach  （OutwardRouting objOutwardRouting  in  objGroupRouting.Outward）
 {
 objlstOutwardRouting.Add（objOutwardRouting）; 
} 
} 
 objlstOutwardRouting = objlstOutwardRouting.Union（objlstOutwardRouting）.ToList（）; 

解决方案

似乎你想要执行交叉连接操作。

检查：

 List< string> l1 =  new 列表< string>（）{  A1 ，  A2，  A3，  A4}; 
 List< string> l2 =  new 列表< string>（）{  B1 ，  B2，  B3，  B4}; 
 
  //  标准查询 
  //   var allitems =来自in in l1  
  //  来自b in l2  
  //  选择新{ 
  //   A = a， 
  //   B = b  
  //  };  
 
  //  使用lambda表达式 
  var  lambdaitems = l1.SelectMany（x = >  l2，（x，y）= >   new  {A = x，B = y}） ; 

错误返回相同的结果：

  AB  
 A1 B1 
 A1 B2 
 A1 B3 
 A1 B4 
 A2 B1 
 A2 B2 
 A2 B3 
 A2 B4 
 A3 B1 
 A3 B2 
 A3 B3 
 A3 B4 
 A4 B1 
 A4 B2 
 A4 B3 
 A4 B4 

试试！



如需了解更多信息，请参阅：

C＃中的101个LINQ样本 [ ^ ]

LINQ 101个样本 - Lambda样式 [ ^ ]

I have 1 list of records that list have some sub list of records i need merge that two list record in generic list .


Any one help me ....



EXAMPLE

LIST 1     A1,A2,A3,A4                LIST 2 B1,B2,B3,B4

Need output like that
A1 B1
A1 B2
A1 B3
A1 B4
A2 b1
A2 B2
.
.
.



like that i need 

What I have tried:

foreach (GroupRouting objGroupRouting in objlstGroupRouting)
                    {
                        foreach (OutwardRouting objOutwardRouting in objGroupRouting.Outward)
                        { 
                            objlstOutwardRouting.Add(objOutwardRouting);
                        }
                    }
                    objlstOutwardRouting = objlstOutwardRouting.Union(objlstOutwardRouting).ToList();

解决方案

Seems you want to perform cross join operation.
Check this:

List<string> l1 = new List<string>(){"A1", "A2", "A3", "A4"};
List<string> l2 = new List<string>(){"B1", "B2", "B3", "B4"};

//standard query
//var allitems = from a in l1 
//				from b in l2
//				select new {
//					A = a,
//					B = b
//				};

//using lambda expressions
var lambdaitems = l1.SelectMany(x=> l2, (x, y) => new {A = x, B = y});

Both queries return the same result:

A B
A1 B1 
A1 B2 
A1 B3 
A1 B4 
A2 B1 
A2 B2 
A2 B3 
A2 B4 
A3 B1 
A3 B2 
A3 B3 
A3 B4 
A4 B1 
A4 B2 
A4 B3 
A4 B4 

Try!

For further information, please see:
101 LINQ Samples in C#[^]
LINQ 101 Samples - Lambda Style[^]

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