LINQ枢轴与动态列 [英] LINQ Pivot with dynamic columns

问题描述

我试图创建一个使用LINQ动态列的透视。我创建SQL Server中的数据透视，你不知道哪些列将要习惯。但不知道如何转移到这LINQ。
 有没有人有我的联系上手呢？

干杯

解决方案

 列表＆LT; CustData＆GT; myList中= GetCustData（）;    VAR的查询= myList中
        .GroupBy（C =＆GT; c.CustId）
        。选择（G =＆gt;新建{
            客户ID = g.Key，
            一月= g.Where（C =＆GT; c.OrderDate.Month == 1）.SUM（C =＆GT; c.Qty）
            二月= g.Where（C =＆GT; c.OrderDate.Month == 2）.SUM（C =＆GT; c.Qty）
            三月= g.Where（C =＆GT; c.OrderDate.Month == 3）.SUM（C =＆GT; c.Qty）
        }）;
 

这是从大卫乙在这的网址

I'm trying to create a Pivot using LINQ with dynamic columns. I have created a Pivot in SQL Server where you do not know which columns are going to get used. But don't know how to transfer that into LINQ. Does anyone have links for me to get started on?

Cheers

解决方案

    List<CustData> myList = GetCustData();

    var query = myList
        .GroupBy(c => c.CustId)
        .Select(g => new {
            CustId = g.Key,
            Jan = g.Where(c => c.OrderDate.Month == 1).Sum(c => c.Qty),
            Feb = g.Where(c => c.OrderDate.Month == 2).Sum(c => c.Qty),
            March = g.Where(c => c.OrderDate.Month == 3).Sum(c => c.Qty)
        });

this is the answer from David B in this url

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