Question

问题是当我点击此代码所在的保存按钮时...它说已经定义了参数'@email'...我想要发生的是将这些值插入一列（电子邮件））但不在同一行

string[] email = new string[2];
email[0] = txtEmail1.Text;
email[1] = txtEmail2.Text;

MySqlCommand cmd;

cmd.CommandText = "INSERT INTO email(Id,email)VALUES( @Id,@email)";
cmd.Parameters.AddWithValue("@Id", int.Parse(txtId.Text));

for (int i = 0; i < 2; i += 1)
{
    cmd.Parameters.AddWithValue("@email", email[i]);
    cmd.ExecuteNonQuery();
    if (i==2)
        break;
}

Answer 1

清除循环每次迭代中的参数。

cmd.CommandText = "INSERT INTO email (Id,email) VALUES ( @Id, @email )";

for (int i = 0; i < 2; i++)
{
    cmd.Parameters.Clear();
    cmd.Parameters.AddWithValue("@Id", int.Parse(txtId.Text));
    cmd.Parameters.AddWithValue("@email", email[i]);
    cmd.ExecuteNonQuery();
}

在一列中插入2个文本框中的值

1 个答案: