SMODataFileEnumerator.Reset Method

Reference

Definition

Namespace:: Microsoft.SqlServer.Dts.Runtime.Enumerators.SMO

Assembly:: Microsoft.SqlServer.ForEachSMOEnumerator.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

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

public:
 virtual void Reset();

public void Reset ();

abstract member Reset : unit -> unit
override this.Reset : unit -> unit

Public Sub Reset ()

Implements

Reset()

Examples

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 SMODataFileEnumerator is created as a System.Collections.IEnumerator and iterated over using MoveNext and Current. After the index has passed the end of the collection, 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 SmoDataFileEnumerator  
{  
    class Program  
    {  
        const string PACKAGEFILENAME = @"\SmoDataFileEnumeratorPackage.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.DTSDesigner;  
            package.Name = "SMODataFileEnumerator Sample";  
            package.Description = "This is a sample for SMODataFileEnumerator";  
            // Use System.Environment.MachineName; in the following line of code.  
            package.CreatorComputerName = @"MACHINENAME";  
            // Use System.Environment.UserName; in the following line of code.  
            package.CreatorName = @"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";  

            Console.WriteLine("ForEachLoop creation name: {0}", forEachLoop.CreationName);  
            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='DataFiles']"  
                + @"/SMOEnumType[@Name='Locations']";  

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

            smoDataFileEnumerator.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 SmoDataFileEnumerator  
    Class Program  
        const String PACKAGEFILENAME = "\SmoDataFileEnumeratorPackage.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.DTSDesigner  
            package.Name = "SMODataFileEnumerator Sample"  
            package.Description = "This is a sample for SMODataFileEnumerator"  
            ' Use System.Environment.MachineName; in the following line of code.  
            package.CreatorComputerName = "MACHINENAME"  
            ' Use System.Environment.UserName; in the following line of code.  
            package.CreatorName = "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"  

            Console.WriteLine("ForEachLoop creation name: {0}", forEachLoop.CreationName)  
            ForEachEnumeratorInfo forEachEnumeratorInfo  
                Dim  As =  
            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='DataFiles']"  
                Dim "/SMOEnumType[@Name='Locations']" As +  

            System.Collections.IEnumerator smoDataFileEnumerator = forEachSMOEnumerator.GetEnumerator(  
            connections, Nothing, Nothing, Nothing) as System.Collections.IEnumerator  
            Console.WriteLine("The collection contains the following values:")  
            Dim i As Integer =  0   
            While (smoDataFileEnumerator.MoveNext()) &&(smoDataFileEnumerator.Current <> Nothing)  
                Console.WriteLine("[{0}] {1}",i = Console.WriteLine("[{0}] {1}",i + 1  
            End While  

            smoDataFileEnumerator.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

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.

Applies to

共用方式為