C# Parameters.AddWithValue出现问题并在DataTable中循环

我有一个如下所示的数据表：

[0]    [1]
"Z12"  "Company A"
"A32"  "Company B"
"K54"  "Company C"

"Z12"  "Company A"
"Z12"  "Company A"
"Z12"  "Company A"

OleDbConnection myConnection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\myDB.accdb");

OleDbCommand cmd = new OleDbCommand();

cmd.Connection = myConnection;
cmd.CommandType = CommandType.Text;

myConnection.Open();

for (int i = 0; i <= dt.Rows.Count - 1; i++)
{
    cmd.Parameters.Clear(); 
    cmd.CommandText = "INSERT INTO xCARRIER (CARRIER_ID, CARRIER_NAME) VALUES (@p1, @p2)";

    cmd.Parameters.AddWithValue("@p1", dt.Rows[i].ItemArray.GetValue(0));
    cmd.Parameters.AddWithValue("@p2", dt.Rows[i].ItemArray.GetValue(1));

    cmd.ExecuteNonQuery();
}

myConnection.Close();

我正在尝试遍历这些行，并使用以下代码将它们添加到Access表中：

OleDbConnection myConnection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\myDB.accdb");

OleDbCommand cmd = new OleDbCommand();

cmd.Connection = myConnection;
cmd.CommandType = CommandType.Text;

myConnection.Open();

for (int i = 0; i <= dt.Rows.Count - 1; i++)
    {
        cmd.CommandText = "INSERT INTO xCARRIER (CARRIER_ID, CARRIER_NAME) VALUES (@p1, @p2)";

        cmd.Parameters.AddWithValue("@p1", dt.Rows[i].ItemArray.GetValue(0));
        cmd.Parameters.AddWithValue("@p2", dt.Rows[i].ItemArray.GetValue(1));

        cmd.ExecuteNonQuery();
    }

myConnection.Close();

当我一步一步地浏览代码时，它看起来像是在正确地遍历数据表。不过，我不知道为什么要将第一行添加3次。有什么想法吗

---

谢谢

您可以在每次迭代后清除命令参数：

 command.Parameters.Clear();

因此，您的代码如下所示：

[0]    [1]
"Z12"  "Company A"
"A32"  "Company B"
"K54"  "Company C"

"Z12"  "Company A"
"Z12"  "Company A"
"Z12"  "Company A"

OleDbConnection myConnection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\myDB.accdb");

OleDbCommand cmd = new OleDbCommand();

cmd.Connection = myConnection;
cmd.CommandType = CommandType.Text;

myConnection.Open();

for (int i = 0; i <= dt.Rows.Count - 1; i++)
{
    cmd.Parameters.Clear(); 
    cmd.CommandText = "INSERT INTO xCARRIER (CARRIER_ID, CARRIER_NAME) VALUES (@p1, @p2)";

    cmd.Parameters.AddWithValue("@p1", dt.Rows[i].ItemArray.GetValue(0));
    cmd.Parameters.AddWithValue("@p2", dt.Rows[i].ItemArray.GetValue(1));

    cmd.ExecuteNonQuery();
}

myConnection.Close();

OleDbConnection myConnection=new-OleDbConnection（“Provider=Microsoft.ACE.OLEDB.12.0；数据源=C:\\myDB.accdb”）；
OleDbCommand cmd=新的OleDbCommand（）；
cmd.Connection=myConnection；
cmd.CommandType=CommandType.Text；
myConnection.Open（）；
对于（int i=0；我这样做了。我在
cmd.ExecuteNonQuery
之后立即添加了它。谢谢！