OleDbDataReader.Close 方法

public:
 override void Close();

public:
 virtual void Close();

public override void Close();

public void Close();

override this.Close : unit -> unit

abstract member Close : unit -> unit
override this.Close : unit -> unit

Public Overrides Sub Close ()

Public Sub Close ()

实现

示例

以下示例创建 OleDbConnection、 OleDbCommand和 OleDbDataReader。 该示例读取数据，将其写出到控制台。 最后，该示例关闭 ， OleDbDataReader然后 OleDbConnection关闭 。

private static void ReadData(string connectionString)
{
    string queryString = "SELECT OrderID, CustomerID FROM Orders";
    using (OracleConnection connection = new OracleConnection(connectionString))
    {
        OracleCommand command = new OracleCommand(queryString, connection);
        connection.Open();
        OracleDataReader reader;
        reader = command.ExecuteReader();

        // Always call Read before accessing data.
        while (reader.Read())
        {
            Console.WriteLine(reader.GetInt32(0) + ", " + reader.GetString(1));
        }

        // Always call Close when done reading.
        reader.Close();
    }
}

Public Sub ReadData(ByVal connectionString As String)
    Dim queryString As String = _
        "SELECT OrderID, CustomerID FROM Orders"

    Using connection As New OracleConnection(connectionString)
        Dim command As New OracleCommand(queryString, connection)
        connection.Open()

        Dim reader As OracleDataReader
        reader = command.ExecuteReader()

        ' Always call Read before accessing data.
        While reader.Read()
            Console.WriteLine(reader.GetInt32(0) & ", " & reader.GetString(1))
        End While

        ' Always call Close when done reading.
        reader.Close()
    End Using
End Sub

注解

使用 时，必须显式调用 Close 方法，以便将 OleDbDataReader 关联的 OleDbConnection 用于任何其他目的。

另请参阅

• DataAdapter 和 DataReader