SMOEnumerator.Reset Method

Artigo
12/03/2008

Sets the enumerator to its initial position, which is before the first element in the collection.

Namespace: Microsoft.SqlServer.Dts.Runtime.Enumerators.SMO
Assembly: Microsoft.SqlServer.ForEachSMOEnumerator (in microsoft.sqlserver.foreachsmoenumerator.dll)

Syntax

'Declaration
Public Sub Reset

public void Reset ()

public:
virtual void Reset () sealed

public final void Reset ()

public final function Reset ()

Remarks

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 causes an exception.

Example

The following code example creates a ForEachLoop, creates a SMO enumerator and hosts it in a ForEachEnumeratorHost, where it is then added as the ForEachEnumerator in the ForEachLoop. Returning a ForEachSMOEnumerator, a SMOEnumerator is created as a System.Collections.IEnumerator and iterated over using MoveNext and Current. After the collection has passed the end, the Reset is used to reset the iterator.

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

namespace SMOEnumerator
{
    class Program
    {
        const string PACKAGEFILENAME = @"\SamplePackage.dtsx";

        static void Main(string[] args)
        {
            // Create the SSIS application
            Application application = new Application();

            // Create the new package
            Package package = new Package();
            package.PackageType = DTSPackageType.DTSDesigner90;
            package.Name = "SMOEnumerator Sample";
            package.Description = "This is a sample for SMOEnumerator";
            package.CreatorComputerName = @"MACHINENAME"; // System.Environment.MachineName;
            package.CreatorName = @"USERNAME"; //System.Environment.UserName;

            // Adds the ADO.NET connection manager to the package
            Connections connections = package.Connections;
            ConnectionManager connectionManager = connections.Add("ADO.NET:SQL");
            Console.WriteLine("ConnectionManager creation name: {0}", connectionManager.CreationName);
            connectionManager.Name = @"localhost.AdventureWorks";
            connectionManager.ConnectionString = @"Data Source=localhost;"
                + "Initial Catalog=AdventureWorks;"
                + "Integrated Security=True;";

            // Create ForEach SMO Loop task
            Executables executables = package.Executables;
            ForEachLoop forEachLoop = executables.Add("STOCK:FOREACHLOOP") as ForEachLoop;
            forEachLoop.Name = "Foreach Loop Container";
            forEachLoop.Description = "Foreach Loop Container";

            ForEachEnumeratorInfo forEachEnumeratorInfo = application.ForEachEnumeratorInfos["Foreach SMO Enumerator"];
            ForEachEnumeratorHost forEachEnumeratorHost = forEachEnumeratorInfo.CreateNew();
            forEachLoop.ForEachEnumerator = forEachEnumeratorHost;

            // Setup the SMO enumerator
            ForEachSMOEnumerator forEachSMOEnumerator = forEachEnumeratorHost.InnerObject as ForEachSMOEnumerator;
            forEachSMOEnumerator.EnumURN = @"RuntimeServer[@Connection='"
                + connectionManager.ID + @"']/Server[@Name='localhost']"
                + @"/Database[@Name='AdventureWorks']"
                + @"/SMOEnumObj[@Name='Tables']"
                + @"/SMOEnumType[@Name='ObjectsPP']";

            System.Collections.IEnumerator smoEnumerator = (System.Collections.IEnumerator)forEachSMOEnumerator.GetEnumerator(
            connections, null, null, null);
            Console.WriteLine("The collection contains the following values:");
            int i = 0;
            while ((smoEnumerator.MoveNext()) && (smoEnumerator.Current != null))
                Console.WriteLine("[{0}] {1}", i++, smoEnumerator.Current);

             smoEnumerator.Reset();

            // Validate the layout of the package
            DTSExecResult status = package.Validate(package.Connections, null, null, null);
            Console.WriteLine("Validation result: " + status);

            // Save the package
            String currentDirectory = Environment.CurrentDirectory;
            application.SaveToXml(currentDirectory + PACKAGEFILENAME, package, null);
            Console.WriteLine(@"Package saved to " + currentDirectory + PACKAGEFILENAME);
        }
    }
}

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime
Imports Microsoft.SqlServer.Dts.Runtime.Enumerators.SMO
 
Namespace SMOEnumerator
    Class Program
        const String PACKAGEFILENAME = "\SamplePackage.dtsx"
 
        Shared  Sub Main(ByVal args() As String)
            ' Create the SSIS application
            Dim application As Application =  New Application() 
 
            ' Create the new package
            Dim package As Package =  New Package() 
            package.PackageType = DTSPackageType.DTSDesigner90
            package.Name = "SMOEnumerator Sample"
            package.Description = "This is a sample for SMOEnumerator"
            package.CreatorComputerName = "MACHINENAME" ' System.Environment.MachineName;
            package.CreatorName = "USERNAME" 'System.Environment.UserName;
 
            ' Adds the ADO.NET connection manager to the package
            Dim connections As Connections =  package.Connections 
            Dim connectionManager As ConnectionManager =  connections.Add("ADO.NET:SQL") 
            Console.WriteLine("ConnectionManager creation name: {0}", connectionManager.CreationName)
            connectionManager.Name = "localhost.AdventureWorks"
            connectionManager.ConnectionString = "Data Source=localhost;"
                + "Initial Catalog=AdventureWorks;"
                Dim "Integrated Security=True;" As +
 
            ' Create ForEach SMO Loop task
            Dim executables As Executables =  package.Executables 
            Dim forEachLoop As ForEachLoop =  executables.Add("STOCK:FOREACHLOOP") as ForEachLoop 
            forEachLoop.Name = "Foreach Loop Container"
            forEachLoop.Description = "Foreach Loop Container"
 
            Dim forEachEnumeratorInfo As ForEachEnumeratorInfo =  application.ForEachEnumeratorInfos("Foreach SMO Enumerator") 
            Dim forEachEnumeratorHost As ForEachEnumeratorHost =  forEachEnumeratorInfo.CreateNew() 
            forEachLoop.ForEachEnumerator = forEachEnumeratorHost
 
            ' Setup the SMO enumerator
            Dim forEachSMOEnumerator As ForEachSMOEnumerator =  forEachEnumeratorHost.InnerObject as ForEachSMOEnumerator 
            forEachSMOEnumerator.EnumURN = "RuntimeServer[@Connection='"
                + connectionManager.ID + "']/Server[@Name='localhost']"
                + "/Database[@Name='AdventureWorks']"
                + "/SMOEnumObj[@Name='Tables']"
                Dim "/SMOEnumType[@Name='ObjectsPP']" As +
 
            System.Collections.IEnumerator smoEnumerator = (System.Collections.IEnumerator)forEachSMOEnumerator.GetEnumerator(
                connections, Nothing, Nothing, Nothing)
            Console.WriteLine("The collection contains the following values:")
            Dim i As Integer =  0 
            While (smoEnumerator.MoveNext()) &&(smoEnumerator.Current <> Nothing)
            Console.WriteLine("[{0}] {1}",i = Console.WriteLine("[{0}] {1}",i + 1
            End While
 
             smoEnumerator.Reset()
 
            ' Validate the layout of the package
            Dim status As DTSExecResult =  package.Validate(package.Connections,Nothing,Nothing,Nothing) 
            Console.WriteLine("Validation result: " + status)
 
            ' Save the package
            Dim currentDirectory As String =  Environment.CurrentDirectory 
            application.SaveToXml(currentDirectory + PACKAGEFILENAME, package, Nothing)
            Console.WriteLine("Package saved to " + currentDirectory + PACKAGEFILENAME)
        End Sub
    End Class
End Namespace

Thread Safety

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.

Platforms

Development Platforms

For a list of the supported platforms, see Hardware and Software Requirements for Installing SQL Server 2005.

Target Platforms

For a list of the supported platforms, see Hardware and Software Requirements for Installing SQL Server 2005.

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