C# 和 ms 數據庫 - 標准表達式中的數據類型不匹配

Question

我正在構建一個應用程序，當我按下按鈕時，操作需要保存在 Microsoft Access 數據庫中，但是當我按下按鈕時，我從代碼的下一部分收到錯誤“標准表達式中的數據類型不匹配”

        string dbconnection = "Provider=Microsoft.ACE.OLEDB.12.0;" + @"data source =ElevatorLog.accdb";
        string dbcommand = "insert into [Elevator] ([MovingAction],[TimeAction]) values (@movingaction, @timeaction)";
        string timeaction = DateTime.Now.ToShortDateString();


        listBox1.Items.Add(movingaction + "\t\t" + timeaction + "\t\t");

        OleDbConnection conn_db = new OleDbConnection(dbconnection);
        OleDbCommand comm_insert = new OleDbCommand(dbcommand, conn_db);
        OleDbDataAdapter adapter_insert = new OleDbDataAdapter(comm_insert);
        comm_insert.Parameters.AddWithValue("@timeaction", timeaction);
        comm_insert.Parameters.AddWithValue("@movingaction", movingaction);

        conn_db.Open();

        comm_insert.ExecuteNonQuery();

        conn_db.Close();

Answer 1

我不知道您的數據類型是什么，但部分從代碼中猜測：

string dbconnection = "Provider=Microsoft.ACE.OLEDB.12.0;" + @"data source =ElevatorLog.accdb";
string dbcommand = @"insert into [Elevator] 
       ([MovingAction],[TimeAction]) 
       values 
       (@movingaction, @timeaction)";


//?        listBox1.Items.Add(movingaction + "\t\t" + timeaction + "\t\t");

using (OleDbConnection conn_db = new OleDbConnection(dbconnection))
using (OleDbCommand comm_insert = new OleDbCommand(dbcommand, conn_db))
{
   comm_insert.Parameters.Add("@movingaction", OleDbType.DBDate).Value = movingaction; // not sure if this is DateTime
   comm_insert.Parameters.Add("@timeaction", OleDbType.DBDate).Value = DateTime.Now;

  conn_db.Open();
  comm_insert.ExecuteNonQuery();
  conn_db.Close();
}

PS：只是一個建議，選擇一個更好的數據庫，如 postgreSQL，MS SQL，MySQL，Z497757A9C5B2ECC78DEDZ65...