Linq 操作DataTable

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本文介绍了一种使用C#中的LINQ技术操作DataTable的方法。通过创建DataTable并填充数据，然后利用LINQ进行查询和转换，最终实现了数据的有效管理和操作。此外，还展示了如何将查询结果存储到List和Dictionary中。

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class ClientStruct
        {
            public string ID = "ID";
            public string Name = "Name";
            public string Company = "Company";
            public string CreatedDate = "CreatedDate";
        }

public string[,] infoArr = new string[,] { { "1", "百度", "baidu", "201303" }, { "2", "迅雷", "xunlei", "201302" }, { "3", "谷歌", "guge", "201301" } };

protected 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
            List<string> lstID = (from d in dtTable.AsEnumerable()
                                  select d.Field<string>(cs.ID)).ToList<string>();

            //遍历DataTable，将其中的数据对应到ClientStruct中：
            List<ClientStruct> list = (from x in dtTable.AsEnumerable()
                                       orderby x.Field<string>(cs.Company)
                                       select new ClientStruct
                                       {
                                           ID = x.Field<string>(cs.ID),
                                           Name = x.Field<string>(cs.Name),
                                           Company = x.Field<string>(cs.Company),
                                           CreatedDate = x.Field<string>(cs.CreatedDate)
                                       }).ToList<ClientStruct>();

            //遍历DataTable，并将上面的List结果存储到Dictionary中：
            Dictionary<string, ClientStruct> dic = list.ToDictionary(p => p.Company);
            //p作为string键值来存储
        }

其实关键是AsEnumerable()方法，返回一个 System.Collections.Generic.IEnumerable<T> 对象