ConnectionInfoEnumerator.Current Property

Статья
12/15/2008

Gets the current element in the collection.

Пространство имен: Microsoft.SqlServer.Dts.Runtime
Сборка: Microsoft.SqlServer.ManagedDTS (in microsoft.sqlserver.manageddts.dll)

Синтаксис

'Декларация
Public ReadOnly Property Current As ConnectionInfo

public ConnectionInfo Current { get; }

public:
property ConnectionInfo^ Current {
    ConnectionInfo^ get ();
}

/** @property */
public ConnectionInfo get_Current ()

public function get Current () : ConnectionInfo

Значение свойства

The current element in the collection.

Замечания

After an enumerator is created, or after a call to the Reset method, the MoveNext method must be called to advance the enumerator to the first element of the collection before reading the value of the Current property; otherwise, Current is undefined and throws an exception.

Current also throws an exception if the last call to MoveNext returned false, which indicates the end of the collection.

Current does not move the position of the enumerator, and consecutive calls to the Current return the same object until either MoveNext or Reset is called.

An enumerator remains valid as long as the collection remains unchanged. If changes are made to the collection, such as adding, modifying, or deleting elements, the enumerator is invalidated and becomes irrecoverable; thus, the next call to MoveNext or Reset throws an InvalidOperationException. If the collection is modified between calls to MoveNext and Current, Current returns the element that it is set to, even if the enumerator has been invalidated.

Пример

The following code sample creates an enumerator, and then uses the Current, MoveNext, and Reset methods to navigate over the collection.

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SqlServer.Dts.Runtime;

namespace ConnInfos_Current
{
    class Program
    {
        static void Main(string[] args)
        {
            Application dtsApplication = new Application();
            ConnectionInfos connectionInfos = dtsApplication.ConnectionInfos;

            //Create the Enumerator.
            ConnectionInfoEnumerator ConnInfoEnum = connectionInfos.GetEnumerator();
            Console.WriteLine("The collection contains the following values:");
            int i = 0;
            while ((ConnInfoEnum.MoveNext()) && (ConnInfoEnum.Current != null))
                Console.WriteLine("[{0}] {1}", i++, ConnInfoEnum.Current.Name);
        }
    }
}

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime

Namespace ConnInfos_Current
    Class Program
        Shared  Sub Main(ByVal args() As String)
            Dim dtsApplication As Application =  New Application() 
            Dim connectionInfos As ConnectionInfos =  dtsApplication.ConnectionInfos 
 
            'Create the Enumerator.
            Dim ConnInfoEnum As ConnectionInfoEnumerator =  connectionInfos.GetEnumerator() 
            Console.WriteLine("The collection contains the following values:")
            Dim i As Integer =  0 
            While (ConnInfoEnum.MoveNext()) &&(ConnInfoEnum.Current <> Nothing)
            Console.WriteLine("[{0}] {1}",i = Console.WriteLine("[{0}] {1}",i + 1
            End While
        End Sub
    End Class
End Namespace

Sample Output:

The collection contains the following values:

[0] Connection Manager for Files

[1] Connection Manager for SQL Server 2005 Compact Edition

[2] Connection Manager for Multiple Flat Files

Синхронизация потоков

Any public static (Shared in Microsoft Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Платформы

Платформы разработки

Список поддерживаемых платформ см. в разделе Hardware and Software Requirements for Installing SQL Server 2005.

Целевые платформы