关于DataSet.merge 问题的答案。

代码是关于两个dataSet 分别从不同的数据源取数据，然后进行merge 后，更新其中一个数据源

cn.Open();
                SqlCommand cmd  =   new  SqlCommand(sqlAllCustomers, cn);
                SqlDataAdapter adpt  =   new  SqlDataAdapter(cmd);
               

                 //  Add
                DataSet dsCust1  =   new  DataSet();
                DataSet dsCust2  =   new  DataSet();
                DataSet dsTest  =   new  DataSet();
                 // adpt.AcceptChangesDuringFill = false;
                
                adpt.Fill(dsCust1,  " TABLE1 " );
                 // adpt.AcceptChangesDuringFill = true;
                 using  (SqlConnection cnTemp  =   new  SqlConnection(cnStrTemp))
                 {
                    //SqlConnection cnTemp = new SqlConnection(cnStrTemp);
                    cnTemp.Open();
                    SqlCommand cmdTemp = new SqlCommand(sqlAllCustomers, cnTemp);
                    SqlDataAdapter adptTemp = new SqlDataAdapter(cmdTemp);
                    adptTemp.AcceptChangesDuringFill = false;
                    adptTemp.Fill(dsCust2, "TABLE1");
                }

                 // adpt.Update(dsCust1, "TABLE1");
                dsCust1.Merge(dsCust2);
                
                 // 111
                SqlCommandBuilder objBuilder  =   new  SqlCommandBuilder(adpt);
                
                
                adpt.UpdateCommand  =  objBuilder.GetUpdateCommand();
                adpt.InsertCommand  =  objBuilder.GetInsertCommand();
                adpt.DeleteCommand  =  objBuilder.GetDeleteCommand();

                DataTable updTable  =  dsCust1.Tables[ 0 ];
                adpt.Update(updTable.Select( null , null , DataViewRowState.Added));

其中主要是，对被合并的数据DataAdapter 属性设置为不稳定，更新的时候将取的数据改为add状态才能更新。否则DataSet 虽然merge 了其它的DataSet 表面上虽然数据已经改变了，但是其状态仍然为稳定状态，更新将失败。 

转载于:https://www.cnblogs.com/playboy2005/archive/2006/06/13/424401.html