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//方法1
DbTable table = new DbTable(new string[] { "ID", "CLASSNAME" }, new DbDataType[] { DbDataType.Number, DbDataType.String });
            table.Add(new object[] { 1, "饮料" });
return table;

//方法2
DataTable tab = new DataTable();
tab.Columns.Add("ID");
tab.Columns.Add("CLASSNAME");
DataRow row = tab.NewRow();
row["ID"] = 1;
row["CLASSNAME"] = "wwww";
tab.Rows.Add(row);
DataTableReader reader = new DataTableReader(tab);
return reader;