通过声明

Question

添加更多的项目到一组我有这个疑问：

var rowsPerProvider = (from row in dt.Select() 
     let emp = row["f_name"].ToString().Trim() 
     group row by emp 
     into g 
     select g).ToDictionary(
      g => g.Key, 
      g => g.ToArray()); 

如何更新它也对一些列过滤器？例如目前它在f_name上。我如何将它更新到f_name和m_name和l_name？

Answer 1

请通过包含要下地组的匿名对象：

var rowsPerProvider = (from row in dt.Select() 
    group row by new 
    { 
     emp1 = row["f_name"].ToString().Trim(), 
     emp2 = row["m_name"].ToString().Trim(), 
     emp3 = row["l_name"].ToString().Trim(), 
    } 
    into g 
    select g).ToDictionary(
     g => g.Key, 
     g => g.ToArray()); 

Answer 2

使用匿名类：

// (...) 
    group row by new { emp, something }