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分享//1、在SQL语句里添加
select 'f00' as food_id, '' as food_name union select food_id, food_name from food
//2、在取出后添加
DataRow dr = dt.NewRow();
dr["food_id"] = "f00";
dr["food_name"] = "";
dt.Rows.InsertAt(dr, 0);
this.comboBox1.DataSource = dt;