代码如下：

//表dt中含有字段名称列List
     
       fieldList = dt.AsEnumerable().Select(t => t.Field
      
       ("字段名称")).ToList
       
        (); //还可以 List
        
          fieldList2=(from d in dt.AsEnumerable() select d.Field
         
          ("字段名称")).ToList
          
           ();
          
         
        
       
      
     

其中dt.AsEnumerable()得到datarow的集合，对于DataRow有一个Field<T>("列名")的方法：dr.Field<string>("字段名称")，得到字符串类型的值。

扩展：Lambda表达式和Linq

class Program    {        static void Main(string[] args)        {            LinqDataTable();        }        public static string[,] infoArr = new string[,] { { "1", "百度", "baidu", "201303" }, { "2", "迅雷", "xunlei", "201302" }, { "3", "谷歌", "guge", "201301" } };        protected static void LinqDataTable()        {            DataRow row;            ClientStruct cs = new ClientStruct();            DataTable dtTable = new DataTable();            dtTable.Columns.Add(cs.ID);            dtTable.Columns.Add(cs.Name);            dtTable.Columns.Add(cs.Company);            dtTable.Columns.Add(cs.CreatedDate);            for (int i = 0; i < 3; i++)            {                row = dtTable.NewRow();                row[cs.ID] = infoArr[i, 0];                row[cs.Name] = infoArr[i, 1];                row[cs.Company] = infoArr[i, 2];                row[cs.CreatedDate] = infoArr[i, 3];                dtTable.Rows.Add(row);            }            //遍历DataTable，取出所有的ID            //第一种：            List
     
       lstID = (from d in dtTable.AsEnumerable()                                  select d.Field
      
       (cs.ID)).ToList
       
        ();            //第二种：            List
        
          allId = dtTable.AsEnumerable().Select(d => d.Field
         
          ("ID")).ToList();            //遍历DataTable，将其中的数据对应到ClientStruct中            //第一种：            List
          
            list = (from x in dtTable.AsEnumerable() orderby x.Field
           
            (cs.Company) select new ClientStruct { ID = x.Field
            
             (cs.ID), Name = x.Field
             
              (cs.Name), Company = x.Field
              
               (cs.Company), CreatedDate = x.Field
               
                (cs.CreatedDate) }).ToList
                
                 (); //第二种： List
                 
                   list2 = dtTable.AsEnumerable().OrderBy(o => o.Field
                  
                   (cs.Company)).Select(x => new ClientStruct { ID = x.Field
                   
                    (cs.ID), Name = x.Field
                    
                     (cs.Name), Company = x.Field
                     
                      (cs.Company), CreatedDate = x.Field
                      
                       (cs.CreatedDate) }).ToList
                       
                        (); //遍历DataTable，并将上面的List结果存储到Dictionary中： Dictionary
                        
                          dic = list.ToDictionary(p => p.Company); //p作为string键值来存储 } } /*遍历DataTable*/ class ClientStruct { public string ID = "ID"; public string Name = "Name"; public string Company = "Company"; public string CreatedDate = "CreatedDate"; }