c# 将DataGridViewRows转换为DataTable数据

         /// 

         /// 将DataGridViewRows转换为DataTable数据
         ///
         /// DataGridView的行集合
         /// 源数据表
         /// 映射关系
         /// 目的数据表
         /// 返回新的DataTable
         public static DataTable Getdatatable(DataGridViewRowCollection Listrows, DataTable dtSource,
                      string[,] colum, DataTable dtDestination)
         {
             //  string[,] colum = { { "id1", "id2" }, { "name1", "name2" } };
             //  colum是源DataGridViewRow到目标DataRow的映射关系
             DataTable dtNew = dtSource.Clone();//复制表结构
             foreach (DataGridViewRow dgvr in Listrows)
             {
                //转换成数据行DataRow
                 DataRow dataRow = (dgvr.DataBoundItem as DataRowView).Row;
                 dtNew.ImportRow(dataRow);  //添加DataRow到DataTable
             }
             string[] copy = new string[colum.Length / 2];
             for (int i = 0; i < colum.Length / 2; i++)
             {
                 copy[i] = colum[i, 0];  //获取源数据要的列
             }
             //复制源表结构和数据，并只保留copy数据中的列
             DataTable dtNew2 = dtNew.DefaultView.ToTable(false, copy);
             if (dtDestination != null)
             {
                 for (int j = 0; j < dtNew2.Rows.Count; j++)
                 {
                     DataRow row = dtDestination.NewRow();
                     for (int f = 0; f < colum.Length / 2; f++)
                     {
                         //将源表中每行的各列数据复制到对应的目的表的行中
                         row[colum[f, 1]] = dtNew2.Rows[j][colum[f, 0]];
                     }
                     dtDestination.Rows.Add(row); //添加到目的表
                 }
             }
             return dtDestination;
         }