Método Sequence.GetExpression
Returns a String that contains the expression for the specified property. Null means no expression is assigned.
Namespace: Microsoft.SqlServer.Dts.Runtime
Assembly: Microsoft.SqlServer.ManagedDTS (em Microsoft.SqlServer.ManagedDTS.dll)
Sintaxe
'Declaração
Public Function GetExpression ( _
propertyName As String _
) As String
'Uso
Dim instance As Sequence
Dim propertyName As String
Dim returnValue As String
returnValue = instance.GetExpression(propertyName)
public string GetExpression(
string propertyName
)
public:
virtual String^ GetExpression(
String^ propertyName
) sealed
abstract GetExpression :
propertyName:string -> string
override GetExpression :
propertyName:string -> string
public final function GetExpression(
propertyName : String
) : String
Parâmetros
- propertyName
Tipo: System.String
The name of the property whose expression you want to see.
Valor de retorno
Tipo: System.String
A String that contains the expression used to evaluate the property.
Implementa
IDTSPropertiesProvider.GetExpression(String)
Comentários
The propertyName can be any property available on the object.
Exemplos
The following code example uses SetExpression to modify the value of the Description on a Sequence container. Then GetExpression is used to retrieve the expression.
using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SqlServer.Dts.Runtime;
namespace Microsoft.SqlServer.SSIS.Sample
{
class Program
{
static void Main(string[] args)
{
const String containerName = "Sequence";
Package pkg = new Package();
Sequence sequence = (Sequence)pkg.Executables.Add("STOCK:Sequence");
DtsProperties seqProps = sequence.Properties;
// View information about the Description property
// before setting it using the SetExpression method.
String desc = sequence.Description;
Console.WriteLine("Original value of Description: {0}", desc);
// Use SetExpression to give the Sequence a description.
String myExpression = "\"Testing " + containerName + "\"";
sequence.SetExpression("Description", myExpression);
// Note that I've tried using the Properties bag instead, with no change to the results.
//seqProps["Description"].SetExpression(sequence, myExpression);
//Validate the package to set the expression onto the property.
DTSExecResult valResult = pkg.Validate(null, null, null, null);
// Retrieve the new value and the expression.
String myNewDesc = sequence.Description;
String myNewExpression = sequence.GetExpression("Description");
Console.WriteLine("New value of Description: {0}", myNewDesc);
Console.WriteLine("Expression for Description: {0}", myNewExpression);
}
}
}
Sample Output:
Original value of Description:
New value of Description: Testing Sequence
Expression for Description: "Testing Sequence"