Variables Class

Contains a collection of Variables objects, which are accessed through several objects. This class cannot be inherited.

Inheritance Hierarchy


Namespace:  Microsoft.SqlServer.Dts.Runtime
Assembly:  Microsoft.SqlServer.ManagedDTS (in Microsoft.SqlServer.ManagedDTS.dll)


Public NotInheritable Class Variables _
    Inherits DTSReadOnlyCollectionBase
Dim instance As Variables
public sealed class Variables : DTSReadOnlyCollectionBase
public ref class Variables sealed : public DTSReadOnlyCollectionBase
type Variables =  
        inherit DTSReadOnlyCollectionBase
public final class Variables extends DTSReadOnlyCollectionBase

The Variables type exposes the following members.


  Name Description
Public property Count Gets the number of elements contained in the DTSReadOnlyCollectionBase instance. (Inherited from DTSReadOnlyCollectionBase.)
Public property IsSynchronized Gets a value that indicates whether access to the DTSReadOnlyCollectionBase is synchronized (thread-safe). (Inherited from DTSReadOnlyCollectionBase.)
Public property Item Returns a Variable object from the Variables collection.
Public property Locked A Boolean indicating whether the variables in the Variables collection are locked.
Public property SyncRoot Gets an object that can be used to synchronize access to the DTSReadOnlyCollectionBase. (Inherited from DTSReadOnlyCollectionBase.)



  Name Description
Public method Add Adds a Variable object to the Variables collection.
Public method Contains Returns a Boolean that indicates whether the items in the collection can be accessed by using indexing without throwing an exception.
Public method CopyTo Copies the entire DTSReadOnlyCollectionBase to a compatible one-dimensional array, starting at the specified index of the target array. (Inherited from DTSReadOnlyCollectionBase.)
Protected method CreateManagedObject Infrastructure. (Inherited from DTSReadOnlyCollectionBase.)
Public method Equals (Inherited from Object.)
Protected method Finalize (Inherited from Object.)
Protected method GetCount Infrastructure. (Inherited from DTSReadOnlyCollectionBase.)
Public method GetEnumerator Returns a VariableEnumerator enumerator for use in iterating over the Variables collection.
Public method GetHashCode (Inherited from Object.)
Protected method GetManagedEnumerator Infrastructure. (Inherited from DTSReadOnlyCollectionBase.)
Public method GetType (Inherited from Object.)
Protected method MemberwiseClone (Inherited from Object.)
Public method Remove Removes a Variable object from the Variables collection.
Public method ToString (Inherited from Object.)
Public method Unlock Releases the locks on the variables collection and flags the state of the variables collection as invalid or unknown.



  Name Description
Protected field m_unmanagedColl Infrastructure. (Inherited from DTSReadOnlyCollectionBase.)



Integration Services (SSIS) provides system variables and supports custom user variables. When you create a new package, add a container or a task to the package, or create an event handler, SSIS automatically includes a set of system variables for the item. System variables are always located in the System namespace. System variables contain useful information about the package and its containers, tasks, and event handlers. System variables contain information such as the name of the computer on which the package runs and the time the package starts. You can view the information that is contained in a system variable, but you cannot add to or update system variables.

You can also create custom variables for use in packages, containers, tasks, transformations, and precedence constraints. Custom variables can be created in the User namespace or a namespace of your choice. Custom variables can be used in the expressions that the For Loop container, the Derived Column transformation, the Conditional Split transformation, and precedence constraints may contain. For more information, see Using Variables in Packages.

Every container in the SSIS object model has a Variables collection. This collection is accessible to each child of the container. A variable is accessed from the collection by using its name or its index. The Variables collection on a container represents an aggregation of the variables in the collection of its parent. The Variables collection of the Package class is visible to all objects in the package, providing a globally visible collection. Conversely, the variables contained in a task are limited in scope and visibility, and are only visible by the task.


The Variables is used with the Runtime classes. If you are using data flow components (Microsoft.SqlServer.Dts.Pipeline), you may be required to use the IDTSVariables100. To know which variables collection to use, see the documentation for the object you are acquiring variables on, and verify the return value.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.