我正在尝试使用linq基于列的值创建动态对象

Question

根据列的值，我尝试创建具有特定属性值的对象。如何修改以下查询来执行此操作？ // object alertCode具有“code”和“description”属性的代码，具体取决于查询返回的alert_type值。

var medicalcodes = new string[]{"M", "D", "5"};
var specialedcodes = new string []{"C", "I"};
var personalcommentscodes = new string []{"A"};
var academiccodes = new string[]{"R", "E", "S"};

List<alertCode alertCollections = (from a in alertinfo
                                   select new alertCode{
                                      where medicalcodes.Contains(a.alert_type)
                                       code = 'M',
                                       where specialcodes.Contains(a.alert_type)
                                        code = 'S',
                                       where personalcommentscodes.Contains(a.alert_type)
                                        code = 'P',
                                        where academiccodes.Contains(a.alert_type)
                                         code = 'A',
                                         desc = a.description
                                     } ).ToList();

Answer 1

我已将代码计算移到单独的方法

var query = alertinfo.Select(a => new alertCode()
                      {
                         code = GetCodeFor(a.alert_type),
                         desc = a.description
                      }).ToList();  

代码计算：

private char GetCodeFor(string alertType)
{
     if (medicalcodes.Contains(alertType)
         return 'M';
     if (specialcodes.Contains(alertType)
         return 'S';
     if (personalcommentscodes.Contains(alertType)
         return 'P';
     if (academiccodes.Contains(alertType))
         return 'A';

     // return default value
}