通过使用C＃进行数据表分组

Question

I have a Datatable called " ConflictData ". I want to do this SQL command by using LINQ

Select ID from ConflictData group by ID,DesignArticle,DesignNo,PatternCode having count(ID)>=2))

I try this

   var ID = from item in ConflictDatas.AsEnumerable()
                             group item by new
                 {
                     ID = item.ID,
                     DesignArticle = item.DesignArticle,
                     DesignNo = item.DesignNo,
                     PatternCode = item.PatternCode
                 } into g
                             where g.Count() > 2
                             select new
                              {
                                  ID = g.Key.ID
                              };

But it show the error:

Error 2 'System.Data.DataRow' does not contain a definition for 'ID','DesignArticle','DesignNo','PatternCode' and no extension method 'ID','DesignArticle','DesignNo','PatternCode' accepting a first argument of type 'System.Data.DataRow' could be found (are you missing a using directive or an assembly reference?)

I pretty sure datatable " ConflictDatas " have these Columns.

How do I modify my LINQ ? Thanks.

Answer 1

use Field<datatype>("columnName") to fetch cell value of given column in datatable row as below

var ID = from item in ConflictDatas.AsEnumerable()
                             group item by new
                 {
                     ID = item.Field<int>("ID"),
                     DesignArticle = item.Field<string>("DesignArticle"),
                     DesignNo = item.Field<string>("DesignNo"),
                     PatternCode = item.Field<string>("PatternCode")
                 } into g
                             where g.Count() > 2
                             select new
                              {
                                  ID = g.Key.ID
                              };