SqlCeDataReader.Close 方法

關閉 SqlCeDataReader 物件。

命名空間：  System.Data.SqlServerCe
組件：  System.Data.SqlServerCe (在 System.Data.SqlServerCe.dll 中)

語法

'宣告
Public Overrides Sub Close
'用途
Dim instance As SqlCeDataReader

instance.Close()

public override void Close()

public:
virtual void Close() override

abstract Close : unit -> unit 
override Close : unit -> unit 

public override function Close()

實作

IDataReader.Close()

備註

若要將相關聯的 SqlCeConnection 用於任何其他用途，則首先必須在用畢 SqlCeDataReader 時明確地呼叫 Close 方法；不過，您也可以在相同的連接中建立多個讀取器。

範例

下列範例會建立 SqlCeConnection、SqlCeCommand 和 SqlCeDataReader。此範例會讀取全部的資料，並將資料寫出至主控台。最後，此範例將關閉 SqlCeDataReader，然後再關閉 SqlCeConnection。

Dim conn As SqlCeConnection = Nothing
Dim cmd As SqlCeCommand = Nothing
Dim rdr As SqlCeDataReader = Nothing

Try
    ' Open the connection and create a SQL command
    '
    conn = New SqlCeConnection("Data Source = AdventureWorks.sdf")
    conn.Open()

    cmd = New SqlCeCommand("SELECT * FROM DimEmployee", conn)

    rdr = cmd.ExecuteReader()

    ' Iterate through the results
    '
    While rdr.Read()
        Dim employeeID As Integer = rdr.GetInt32(0) ' or: rdr["EmployeeKey"];
        Dim lastName As String = rdr.GetString(5) ' or: rdr["FirstName"];
    End While

    ' Always dispose data readers and commands as soon as practicable
    '
    rdr.Close()
    cmd.Dispose()
Finally
    ' Close the connection when no longer needed
    '
    conn.Close()
End Try

SqlCeConnection conn = null;
SqlCeCommand cmd = null;
SqlCeDataReader rdr = null;

try
{
    // Open the connection and create a SQL command
    //
    conn = new SqlCeConnection("Data Source = AdventureWorks.sdf");
    conn.Open();

    cmd = new SqlCeCommand("SELECT * FROM DimEmployee", conn);

    rdr = cmd.ExecuteReader();

    // Iterate through the results
    //
    while (rdr.Read())
    {
        int employeeID = rdr.GetInt32(0);   // or: rdr["EmployeeKey"];
        string lastName = rdr.GetString(5); // or: rdr["FirstName"];
    }

    // Always dispose data readers and commands as soon as practicable
    //
    rdr.Close();
    cmd.Dispose();
}
finally
{
    // Close the connection when no longer needed
    //
    conn.Close();
}

請參閱

參考

SqlCeDataReader 類別

System.Data.SqlServerCe 命名空間