.net - 任何用于逆透视数据的 .Net 函数或 linq 查询

Question

是否有任何 .net 库可用于 unpivot excel 数据？我目前正在使用 LinqToExcel 框架从电子表格中读取数据，因此不确定是否有动态 linq 查询可用于执行逆透视。感谢您的任何建议。顺便说一句，我正在寻找一种可以处理多列的解决方案。

例子
原表

Product Location  Customer1   Customer2   Customer3
  A        X          10         20         100

目的地表

Product Location Customer    Demand
  A        X      Customer1    10
  A        X      Customer2    20
  A        X      Customer3    100

Answer 1

尝试这样的事情:

var customer1 =
    from c in excel.Worksheet()
    select new
    {
        Product = c["Product"],
        Location = c["Location"],
        Customer = "Customer1",
        Demand = c["Customer1"],
    };

var customer2 =
    from c in excel.Worksheet()
    select new
    {
        Product = c["Product"],
        Location = c["Location"],
        Customer = "Customer2",
        Demand = c["Customer2"],
    };

var customer3 =
    from c in excel.Worksheet()
    select new
    {
        Product = c["Product"],
        Location = c["Location"],
        Customer = "Customer3",
        Demand = c["Customer3"],
    };

var customers = customer1.Union(customer2).Union(customer3);

根据您的评论试试这个:

var columns = 4; /* how many columns to unpivot */
var customers =
    from n in Enumerable.Range(2, columns)
    from c in excel.Worksheet()
    select new
    {
        Product = c["Product"].Value,
        Location = c["Location"].Value,
        Column = n.ToString(),
        Demand = c[n].Value,
    };