DBProviderInfoEnumerator.Current Property

Artikel
12/15/2008

Returns the current DBProviderInfo object from the collection.

Namespace: Microsoft.SqlServer.Dts.Runtime
Assembly : Microsoft.SqlServer.ManagedDTS (in microsoft.sqlserver.manageddts.dll)

Syntax

'Declaration
Public ReadOnly Property Current As DBProviderInfo

public DBProviderInfo Current { get; }

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

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

public function get Current () : DBProviderInfo

Eigenschaftswert

The current DBProviderInfo object.

Hinweise

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 an exception is thrown.

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 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. However, 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.

Beispiel

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

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

namespace DBProvInfos_GetEnum
{
    class Program
    {
        static void Main(string[] args)
        {
            Application app = new Application();
            DBProviderInfos dbprovInfos = app.DBProviderInfos;

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

        }
    }
}

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime
 
Namespace DBProvInfos_GetEnum
    Class Program
        Shared  Sub Main(ByVal args() As String)
            Dim app As Application =  New Application() 
            Dim dbprovInfos As DBProviderInfos =  app.DBProviderInfos 
 
            'Create the Enumerator.
            Dim myEnumerator As DBProviderInfoEnumerator =  dbprovInfos.GetEnumerator() 
            Console.WriteLine("The collection contains the following values:")
            Dim i As Integer =  0 
            While (myEnuemrator.MoveNext()) &&(myEnuemrator.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:

Threadsicherheit

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.

Plattformen

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