DtsEnumerator 클래스

아티클
04/26/2013

Defines an abstract base class that implements the IEnumerator methods.

상속 계층

System.Object
Microsoft.SqlServer.Dts.Runtime.DtsEnumerator
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네임스페이스: Microsoft.SqlServer.Dts.Runtime
어셈블리: Microsoft.SqlServer.ManagedDTS(Microsoft.SqlServer.ManagedDTS.dll)

구문

‘선언
Public MustInherit Class DtsEnumerator _
    Implements IEnumerator
‘사용 방법
Dim instance As DtsEnumerator

public abstract class DtsEnumerator : IEnumerator

public ref class DtsEnumerator abstract : IEnumerator

[<AbstractClassAttribute>]
type DtsEnumerator =  
    class 
        interface IEnumerator 
    end

public abstract class DtsEnumerator implements IEnumerator

DtsEnumerator 유형에서 다음 멤버를 표시합니다.

생성자

	이름	설명
	DtsEnumerator	Initializes a new instance of the DtsEnumerator class.

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속성

	이름	설명
	Current	Gets the current element in the collection.

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메서드

	이름	설명
	Equals	(Object에서 상속됨)
	Finalize	(Object에서 상속됨)
	GetHashCode	(Object에서 상속됨)
	GetType	(Object에서 상속됨)
	MemberwiseClone	(Object에서 상속됨)
	MoveNext	Advances the enumerator to the next element of the collection.
	Reset	Sets the enumerator to its initial position, which is before the first element in the collection.
	ToString	(Object에서 상속됨)

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주의

DtsEnumerator is the base interface for all enumerators. The DtsEnumerator allows only reading of the data in the collection and is not used to modify the underlying collection.

Initially, the enumerator is positioned before the first element in the collection. Reset also brings the enumerator back to this position. At this position, calling Current throws an exception. Therefore, you must call MoveNext to advance the enumerator to the first element of the collection before reading the value of Current.

Current returns the same object until either MoveNext or Reset is called. MoveNext sets Current to the next element.

After the end of the collection is passed, the enumerator is positioned after the last element in the collection, and calling MoveNext returns false. If the last call to MoveNext returned false, calling Current throws an exception. To set Current to the first element of the collection again, you can call Reset followed by MoveNext.

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 irrecoverably invalidated and the next call to MoveNext or Reset throws an InvalidOperationException. If the collection is modified between MoveNext and Current, Current will return the element that it is set to, even if the enumerator is already invalidated.

The enumerator does not have exclusive access to the collection; therefore, enumerating through a collection is not a thread-safe procedure. Even when a collection is synchronized, other threads could still modify the collection, which causes the enumerator to throw an exception. To guarantee thread safety during enumeration, you can lock the collection during the entire enumeration or catch the exceptions that result from changes made by other threads.

예

The following code example adds a task to a package then runs the package. The warnings collection is shown by creating a WarningEnumerator, which inherits from this DtsEnumerator class, and displays each warning description.

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

namespace Microsoft.SqlServer.SSIS.Samples
{
    class Program
    {
        static void Main(string[] args)
        {
            Package package = new Package();
            Console.WriteLine("Package warnings count before running: {0}", package.Warnings.Count);

            TaskHost taskH2 = (TaskHost)package.Executables.Add("STOCK:SendMailTask");
            taskH2.FailPackageOnFailure = false;
            taskH2.FailParentOnFailure = false;
            Console.WriteLine("SendMailTask: {0}", taskH2.ID);
 
            // Test that warnings were successfully added to the collection.
            package.MaximumErrorCount = 100;
            package.FailPackageOnFailure = false;
            package.FailParentOnFailure = false;
            package.DelayValidation = true;
            package.Execute();

            Console.WriteLine("Package warnings count after running the package: {0}", package.Warnings.Count);

            // Create the enumerator.
            WarningEnumerator myEnumerator = package.Warnings.GetEnumerator();
            Console.WriteLine("The collection contains the following values:");
            int i = 0;
            while ((myEnumerator.MoveNext()) && (myEnumerator.Current != null))
                Console.WriteLine("[{0}] {1}", i++, myEnumerator.Current.Description);
        }
    }
}

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime
Imports Microsoft.SqlServer.Dts.Tasks.ExecuteSQLTask
 
Namespace Microsoft.SqlServer.SSIS.Samples
    Class Program
        Shared  Sub Main(ByVal args() As String)
            Dim package As Package =  New Package() 
            Console.WriteLine("Package warnings count before running: {0}", package.Warnings.Count)
 
            Dim taskH2 As TaskHost = CType(package.Executables.Add("STOCK:SendMailTask"), TaskHost)
            taskH2.FailPackageOnFailure = False
            taskH2.FailParentOnFailure = False
            Console.WriteLine("SendMailTask: {0}", taskH2.ID)
 
            ' Test that warnings were successfully added to the collection.
            package.MaximumErrorCount = 100
            package.FailPackageOnFailure = False
            package.FailParentOnFailure = False
            package.DelayValidation = True
            package.Execute()
 
            Console.WriteLine("Package warnings count after running the package: {0}", package.Warnings.Count)
 
            ' Create the enumerator.
            Dim myEnumerator As WarningEnumerator =  package.Warnings.GetEnumerator() 
            Console.WriteLine("The collection contains the following values:")
            Dim i As Integer =  0 
            While (myEnumerator.MoveNext()) &&(myEnumerator.Current <> Nothing)
                Console.WriteLine("[{0}] {1}",i = Console.WriteLine("[{0}] {1}",i + 1
            End While
        End Sub
    End Class
End Namespace

Sample Output:

Package warnings count before running: 0

SendMailTask: {34CAEFF9-64BF-401D-B646-C88B705DB971}

Package warnings count after running the package: 2

The collection contains the following values:

[0] The address in the From line is not formed correctly. It is missing an @ or it is not valid.

[1] Subject is empty

스레드 보안

이 유형의 모든 공용 static(Visual Basic에서는 Shared) 멤버는 스레드로부터 안전합니다. 인스턴스 멤버는 스레드로부터의 안전성이 보장되지 않습니다.

참고 항목

참조

Microsoft.SqlServer.Dts.Runtime 네임스페이스

상속 계층

다음을 통해 공유

DtsEnumerator 클래스

상속 계층

구문

생성자

속성

메서드

주의

예

스레드 보안

참고 항목

참조

상속 계층

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