Editar

Partilhar via

OleDbDataReader.GetValues(Object[]) Method

  • Reference

Definition

Namespace:
System.Data.OleDb
Assembly:
System.Data.OleDb.dll
Assembly:
System.Data.dll
Package:
System.Data.OleDb v9.0.0
Source:
OleDbDataReader.cs
Source:
OleDbDataReader.cs
Source:
OleDbDataReader.cs

Populates an array of objects with the column values of the current row.

public:
 override int GetValues(cli::array <System::Object ^> ^ values);
public:
 virtual int GetValues(cli::array <System::Object ^> ^ values);
public override int GetValues (object[] values);
public int GetValues (object[] values);
override this.GetValues : obj[] -> int
abstract member GetValues : obj[] -> int
override this.GetValues : obj[] -> int
Public Overrides Function GetValues (values As Object()) As Integer
Public Function GetValues (values As Object()) As Integer

Parameters

values
Object[]

An array of Object into which to copy the attribute columns.

Returns

Int32

The number of instances of Object in the array.

Implements

GetValues(Object[])

Examples

using System;
using System.Data;
using System.Data.OleDb;

class Class1 {
   public static void Main() {
      using (OleDbConnection connection =
         new OleDbConnection("Provider=SQLOLEDB;Data Source=(local);Integrated Security=SSPI;Initial Catalog=Northwind")) {

         object[] meta = new object[10];
         bool read;

         OleDbCommand command = new OleDbCommand("select * from Region", connection);

         connection.Open();
         OleDbDataReader reader = command.ExecuteReader();

         if (reader.Read()) {
            do {
               int NumberOfColums = reader.GetValues(meta);

               for (int i = 0; i < NumberOfColums; i++)
                  Console.Write("{0} ", meta[i].ToString());

               Console.WriteLine();
               read = reader.Read();
            } while (read);
         }
         reader.Close();
      }
   }
}

Imports System.Data
Imports System.Data.OleDb

Module Module1
   Public Sub Main()
      Using connection As New OleDbConnection("Provider=SQLOLEDB;Data Source=(local);Integrated Security=SSPI;Initial Catalog=Northwind")
         Dim command As New OleDbCommand("select * from Region", connection)

         connection.Open()
         Dim reader As OleDbDataReader = command.ExecuteReader()

         Dim NumberOfColums As Integer
         Dim meta As Object() = New Object(10) {}
         Dim read As Boolean

         If reader.Read() = True Then
            Do
               NumberOfColums = reader.GetValues(meta)

               For i As Integer = 0 To NumberOfColums - 1
                  Console.Write("{0} ", meta(i).ToString())
               Next

               Console.WriteLine()
               read = reader.Read()
            Loop While read = True
         End If

         reader.Close()
      End Using
   End Sub
End Module

Remarks

For most applications, the GetValues method provides an efficient means for retrieving all columns, instead of retrieving each column individually.

You can pass an Object array that contains fewer than the number of columns that are contained in the resulting row. Only the amount of data the Object array holds is copied to the array. You can also pass an Object array whose length is more than the number of columns that are contained in the resulting row.

This method returns DBNull for null database columns.

Applies to

See also