DtsEventHandler.PrecedenceConstraints Propriedade

Definição

Namespace:

Microsoft.SqlServer.Dts.Runtime

Assembly:

Microsoft.SqlServer.ManagedDTS.dll

Retorna uma coleção de restrições de precedência, se houver, encontrada nos executáveis neste contêiner. Esta propriedade é somente para leitura.

public:
 property Microsoft::SqlServer::Dts::Runtime::PrecedenceConstraints ^ PrecedenceConstraints { Microsoft::SqlServer::Dts::Runtime::PrecedenceConstraints ^ get(); };

public Microsoft.SqlServer.Dts.Runtime.PrecedenceConstraints PrecedenceConstraints { get; }

member this.PrecedenceConstraints : Microsoft.SqlServer.Dts.Runtime.PrecedenceConstraints

Public ReadOnly Property PrecedenceConstraints As PrecedenceConstraints

Valor da propriedade

PrecedenceConstraints

Uma coleção de PrecedenceConstraints.

Implementações

PrecedenceConstraints

Exemplos

O exemplo de código a seguir cria um DtsEventHandler para o OnError evento no pacote. Esse DtsEventHandler contêiner contém dois executáveis e estabelece uma restrição de precedência entre eles. O exemplo de código exibe o número de restrições de precedência no contêiner.

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

namespace Microsoft.SqlServer.SSIS.Samples  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            Package pkg = new Package();  
            // Set up a DtsEventHandler for the OnError event of the package.  
            DtsEventHandler dtsEH = (DtsEventHandler)pkg.EventHandlers.Add("OnError");  

            // Show the name and type of the properties in DtsEventHandler  
            // using the Properties collection.  
            DtsProperties props = dtsEH.Properties;  
            String name;  
            TypeCode propType;  
            foreach (DtsProperty prop in props)  
            {  
                propType = prop.Type;  
                name = prop.Name;  
                Console.WriteLine("Name {0}, Type {1}", name, propType);  
            }  

            // When an OnError Event occurs, the Executables collection contains  
            // the items to run. For this example, there will be a SendMailtTask  
            // and a BulkInsertTask with a precedence constraint between them.  
            Executable dtsEH1 = dtsEH.Executables.Add("STOCK:SendMailTask");  
            TaskHost th = (TaskHost)dtsEH1;  
            SendMailTask smTask = (SendMailTask)th.InnerObject;  
            smTask.Subject = "Send Mail task";  

            // Add a second executable to the DtsEventHandler.  
            Executable dtsEH2 = dtsEH.Executables.Add("STOCK:BulkInsertTask");  
            TaskHost th2 = (TaskHost)dtsEH2;  

            // Add a precedence constraint between the two tasks.  
            PrecedenceConstraint pc = dtsEH.PrecedenceConstraints.Add(dtsEH1, dtsEH2);  
            pc.Value = DTSExecResult.Completion;  

            // Review the number of constraints in the DtsEventHandler collection.  
            PrecedenceConstraints pcDTSEH = dtsEH.PrecedenceConstraints;  
            Console.WriteLine("Number of precedence constraints in DtsEventHandler: {0}", dtsEH.PrecedenceConstraints.Count);  

            // Review the number of executables in the DtsEventHandler collection.  
            Console.WriteLine("Number of executables in DtsEventHandler: {0}", dtsEH.Executables.Count);  

            // Remove the first executable in the DtsEventHandler collection.  
            dtsEH.Executables.Remove(0);  
            Console.WriteLine("New number of exeutables in DtsEventHandler: {0}", dtsEH.Executables.Count);  
        }  
    }  
}  

Imports System  
Imports System.Collections.Generic  
Imports System.Text  
Imports Microsoft.SqlServer.Dts.Runtime  
Imports Microsoft.SqlServer.Dts.Tasks.SendMailTask  
Imports Microsoft.SqlServer.Dts.Tasks.BulkInsertTask  

Namespace Microsoft.SqlServer.SSIS.Samples  
    Class Program  
        Shared  Sub Main(ByVal args() As String)  
            Dim pkg As Package =  New Package()   
            ' Set up a DtsEventHandler for the OnError event of the package.  
            Dim dtsEH As DtsEventHandler = CType(pkg.EventHandlers.Add("OnError"), DtsEventHandler)  

            ' Show the name and type of the properties in DtsEventHandler  
            ' using the Properties collection.  
            Dim props As DtsProperties =  dtsEH.Properties   
            Dim name As String  
            Dim propType As TypeCode  
            Dim prop As DtsProperty  
            For Each prop In props  
                propType = prop.Type  
                name = prop.Name  
                Console.WriteLine("Name {0}, Type {1}", name, propType)  
            Next  

            ' When an OnError Event occurs, the Executables collection contains  
            ' the items to run. For this example, there will be a SendMailtTask  
            ' and a BulkInsertTask with a precedence constraint between them.  
            Dim dtsEH1 As Executable =  dtsEH.Executables.Add("STOCK:SendMailTask")   
            Dim th As TaskHost = CType(dtsEH1, TaskHost)  
            Dim smTask As SendMailTask = CType(th.InnerObject, SendMailTask)  
            smTask.Subject = "Send Mail task"  

            ' Add a second executable to the DtsEventHandler.  
            Dim dtsEH2 As Executable =  dtsEH.Executables.Add("STOCK:BulkInsertTask")   
            Dim th2 As TaskHost = CType(dtsEH2, TaskHost)  

            ' Add a precedence constraint between the two tasks.  
            Dim pc As PrecedenceConstraint =  dtsEH.PrecedenceConstraints.Add(dtsEH1,dtsEH2)   
            pc.Value = DTSExecResult.Completion  

            ' Review the number of constraints in the DtsEventHandler collection.  
            Dim pcDTSEH As PrecedenceConstraints =  dtsEH.PrecedenceConstraints   
            Console.WriteLine("Number of precedence constraints in DtsEventHandler: {0}", dtsEH.PrecedenceConstraints.Count)  

            ' Review the number of executables in the DtsEventHandler collection.  
            Console.WriteLine("Number of executables in DtsEventHandler: {0}", dtsEH.Executables.Count)  

            ' Remove the first executable in the DtsEventHandler collection.  
            dtsEH.Executables.Remove(0)  
            Console.WriteLine("New number of exeutables in DtsEventHandler: {0}", dtsEH.Executables.Count)  
        End Sub  
    End Class  
End Namespace  

Saída de exemplo:

Nome CreationName, Cadeia de Caracteres de Tipo

Nome DelayValidation, Tipo Booleano

Descrição do nome, cadeia de caracteres de tipo

Desabilitar nome, tipo booliano

Nome executáveis, objeto Type

Name ExecutionDuration, Type Int32

Name ExecutionResult, Type Object

Name ExecutionStatus, Type Object

Variáveis de nome, objeto Type

Número de restrições de precedência em DtsEventHandler: 1

Número de executáveis em DtsEventHandler: 2

Novo número de exeutables em DtsEventHandler: 1

Comentários

Uma PrecedenceConstraints coleção é uma coleção de PrecedenceConstraint objetos.