ConnectionManager.GetExpression Method
Returns a String that contains the expression for the specified property. Null means that no expression has been assigned.
Namespace: Microsoft.SqlServer.Dts.Runtime
Assembly: Microsoft.SqlServer.ManagedDTS (in Microsoft.SqlServer.ManagedDTS.dll)
Syntax
'Declaration
Public Function GetExpression ( _
propertyName As String _
) As String
'Usage
Dim instance As ConnectionManager
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
Parameters
- propertyName
Type: System.String
The name of the property whose expression you want to see.
Return Value
Type: System.String
A String that contains the expression used to evaluate the property.
Implements
IDTSPropertiesProvider.GetExpression(String)
Remarks
The propertyName can be a connection string, description, name, or protection level. For the connection manager, these are currently the only properties that support expressions.
Besides those common connection manager properties, each connection type has properties that are unique. These properties are listed by the Properties collection.
Examples
The following code example sets an expression on a unique property of the connection manager, and then retrieves it after the package is validated.
using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SqlServer.Dts.Runtime;
namespace ConnMgr_Properties_Collection
{
class Program
{
static void Main(string[] args)
{
// The package is one of the SSIS Samples.
string mySample = @"C:\Program Files\Microsoft SQL Server\100\Samples\Integration Services\Package Samples\CalculatedColumns Sample\CalculatedColumns\CalculatedColumns.dtsx";
// Create an application and load the sample.
Application app = new Application();
Package pkg = app.LoadPackage(mySample, null);
Connections myConns = pkg.Connections;
// Get the Properties collection from the connection manager.
ConnectionManager myConnMgr = myConns[0];
DtsProperties connProperties = myConnMgr.Properties;
// View information about the RetainSameConnection property
// before setting it using the SetExpression method.
Boolean hasProperty = connProperties.Contains("RetainSameConnection");
Console.WriteLine("has RetainSameConnection? {0}", hasProperty);
Object myValue = myConnMgr.Properties["RetainSameConnection"].GetValue(myConnMgr);
String mySValue = myValue.ToString();
Console.WriteLine("value before is {0}", mySValue);
String myTrueString = "true";
// Use SetExpression to set the value to true.
myConnMgr.Properties["RetainSameConnection"].SetExpression(myConnMgr, myTrueString);
// Validate the package to set the expression on the property.
DTSExecResult valResult = pkg.Validate(myConns, null, null, null);
// Now that the value has been set, retrieve the value
// and the expression.
myValue = myConnMgr.Properties["RetainSameConnection"].GetValue(myConnMgr);
mySValue = myValue.ToString();
String myExpression = myConnMgr.Properties["RetainSameConnection"].GetExpression(myConnMgr);
String mySExpression = myExpression.ToString();
Console.WriteLine("value and expression is {0}, {1}", mySValue, mySExpression);
}
}
}
Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime
Namespace ConnMgr_Properties_Collection
Class Program
Shared Sub Main(ByVal args() As String)
' The package is one of the SSIS Samples.
Dim mySample As String = "C:\Program Files\Microsoft SQL Server\100\Samples\Integration Services\Package Samples\CalculatedColumns Sample\CalculatedColumns\CalculatedColumns.dtsx"
' Create an application and load the sample.
Dim app As New Application()
Dim pkg As Package = app.LoadPackage(mySample, Nothing)
Dim myConns As Connections = pkg.Connections
' Get the Properties collection from the connection manager.
Dim myConnMgr As ConnectionManager = myConns(0)
Dim connProperties As DtsProperties = myConnMgr.Properties
' View information about the RetainSameConnection property
' before setting it using the SetExpression method.
Dim hasProperty As [Boolean] = connProperties.Contains("RetainSameConnection")
Console.WriteLine("has RetainSameConnection? {0}", hasProperty)
Dim myValue As [Object] = myConnMgr.Properties("RetainSameConnection").GetValue(myConnMgr)
Dim mySValue As String = myValue.ToString()
Console.WriteLine("value before is {0}", mySValue)
Dim myTrueString As String = "true"
' Use SetExpression to set the value to true.
myConnMgr.Properties("RetainSameConnection").SetExpression(myConnMgr, myTrueString)
' Validate the package to set the expression on the property.
Dim valResult As DTSExecResult = pkg.Validate(myConns, Nothing, Nothing, Nothing)
' Now that the value has been set, retrieve the value
' and the expression.
myValue = myConnMgr.Properties("RetainSameConnection").GetValue(myConnMgr)
mySValue = myValue.ToString()
Dim myExpression As String = myConnMgr.Properties("RetainSameConnection").GetExpression(myConnMgr)
Dim mySExpression As String = myExpression.ToString()
Console.WriteLine("value and expression is {0}, {1}", mySValue, mySExpression)
End Sub
End Class
End Namespace
Sample Output:
has RetainSameConnection? True
value before is False
value and expression is True, true