Spread Studio for .NET使用教程：將復合框綁定到DataReader

在Spread Studio for .NET中你可以將組合框綁定到DataReader。DataReader允許用戶以只讀的形式訪問數(shù)據(jù)源中的數(shù)據(jù)。使用DataReader通常是一個快速返回結(jié)果的方法，下面是詳細的代碼示例：

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C#

/// Set up a connection to the database.

 string dbpath = "c:\\reader.mdb";

 System.Data.OleDb.OleDbConnection dbConn = new System.Data.OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;DATA SOURCE=" + dbpath);

 /// Open a connection and a SELECT command.

 dbConn.Open();

 System.Data.OleDb.OleDbCommand dbCommand = new System.Data.OleDb.OleDbCommand("SELECT * FROM Table1", dbConn);

 /// Open a DataReader on that connection and command.

 System.Data.OleDb.OleDbDataReader dr = dbCommand.ExecuteReader(System.Data.CommandBehavior.CloseConnection);

 /// Loop through the rows returned by the reader.

 ArrayList al = new ArrayList();

 while (dr.Read()) {

      al.Add(dr("Data"));

 }

 /// Populate combo box with data converted to strings.

 string[] s;

 s = al.ToArray(typeof(string));

 FarPoint.Win.Spread.ComboBoxCellType cb = new FarPoint.Win.Spread.ComboBoxCellType();

 cb.Items = s;

 FpSpread1.ActiveSheetView.Cells(0, 0).CellType = cb;

 /// Dispose connection.

 dbConn.Dispose();

VB

' Set up a connection to the database.

 Dim dbpath As String = "c:\reader.mdb"

 Dim dbConn As New System.Data.OleDb.OleDbConnection( _

 "Provider=Microsoft.Jet.OLEDB.4.0;DATA SOURCE=" & dbpath)

 ' Open a connection and a SELECT command.

 dbConn.Open()

 Dim dbCommand As New System.Data.OleDb.OleDbCommand( _

 "SELECT * FROM Table1", dbConn)

 ' Open a DataReader on that connection and command.

 Dim dr As System.Data.OleDb.OleDbDataReader = dbCommand.ExecuteReader(System.Data.CommandBehavior.CloseConnection)

 ' Loop through the rows returned by the reader.

 Dim al As New ArrayList()

 While dr.Read()

      al.Add(dr("Data"))

 End While

 ' Populate combo box with data converted to strings.

 Dim s As String()

 s = al.ToArray(GetType(String))

 Dim cb As New FarPoint.Win.Spread.ComboBoxCellType

 cb.Items = s

 FpSpread1.ActiveSheetView.Cells(0, 0).CellType = cb

 ' Dispose connection.

 dbConn.Dispose()