CurrencyManager Class
Manages a list of Binding objects.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The CurrencyManager type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | Bindings | Gets the collection of bindings being managed. (Inherited from BindingManagerBase.) |
![]() | Count | Gets the number of items in the list. (Overrides BindingManagerBase::Count.) |
![]() | Current | Gets the current item in the list. (Overrides BindingManagerBase::Current.) |
![]() | IsBindingSuspended | Gets a value indicating whether binding is suspended. (Inherited from BindingManagerBase.) |
![]() | List | Gets the list for this CurrencyManager. |
![]() | Position | Gets or sets the position you are at within the list. (Overrides BindingManagerBase::Position.) |
| Name | Description | |
|---|---|---|
![]() | AddNew | Adds a new item to the underlying list. (Overrides BindingManagerBase::AddNew().) |
![]() | CancelCurrentEdit | Cancels the current edit operation. (Overrides BindingManagerBase::CancelCurrentEdit().) |
![]() | CheckEmpty | Infrastructure. Throws an exception if there is no list, or the list is empty. |
![]() | EndCurrentEdit | Ends the current edit operation. (Overrides BindingManagerBase::EndCurrentEdit().) |
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetItemProperties() | Gets the property descriptor collection for the underlying list. (Overrides BindingManagerBase::GetItemProperties().) |
![]() | GetItemProperties(ArrayList, ArrayList) | Gets the collection of property descriptors for the binding using the specified ArrayList. (Inherited from BindingManagerBase.) |
![]() | GetItemProperties(Type, Int32, ArrayList, ArrayList) | Gets the list of properties of the items managed by this BindingManagerBase. (Inherited from BindingManagerBase.) |
![]() | GetListName | Gets the name of the list supplying the data for the binding using the specified set of bound properties. (Overrides BindingManagerBase::GetListName(ArrayList).) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | OnBindingComplete | Raises the BindingComplete event. (Inherited from BindingManagerBase.) |
![]() | OnCurrentChanged | Raises the CurrentChanged event. (Overrides BindingManagerBase::OnCurrentChanged(EventArgs).) |
![]() | OnCurrentItemChanged | Raises the CurrentItemChanged event. (Overrides BindingManagerBase::OnCurrentItemChanged(EventArgs).) |
![]() | OnDataError | Raises the DataError event. (Inherited from BindingManagerBase.) |
![]() | OnItemChanged | Raises the ItemChanged event. |
![]() | OnMetaDataChanged | Raises the MetaDataChanged event. |
![]() | OnPositionChanged | Raises the PositionChanged event. |
![]() | PullData | Pulls data from the data-bound control into the data source, returning no information. (Inherited from BindingManagerBase.) |
![]() | PushData | Pushes data from the data source into the data-bound control, returning no information. (Inherited from BindingManagerBase.) |
![]() | Refresh | Forces a repopulation of the data-bound list. |
![]() | RemoveAt | Removes the item at the specified index. (Overrides BindingManagerBase::RemoveAt(Int32).) |
![]() | ResumeBinding | Resumes data binding. (Overrides BindingManagerBase::ResumeBinding().) |
![]() | SuspendBinding | Suspends data binding to prevents changes from updating the bound data source. (Overrides BindingManagerBase::SuspendBinding().) |
![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
![]() | UpdateIsBinding | Infrastructure. Updates the status of the binding. (Overrides BindingManagerBase::UpdateIsBinding().) |
| Name | Description | |
|---|---|---|
![]() | BindingComplete | Occurs at the completion of a data-binding operation. (Inherited from BindingManagerBase.) |
![]() | CurrentChanged | Occurs when the currently bound item changes. (Inherited from BindingManagerBase.) |
![]() | CurrentItemChanged | Occurs when the state of the currently bound item changes. (Inherited from BindingManagerBase.) |
![]() | DataError | Occurs when an Exception is silently handled by the BindingManagerBase. (Inherited from BindingManagerBase.) |
![]() | ItemChanged | Occurs when the current item has been altered. |
![]() | ListChanged | Occurs when the list changes or an item in the list changes. |
![]() | MetaDataChanged | Occurs when the metadata of the List has changed. |
![]() | PositionChanged | Occurs after the value of the Position property has changed. (Inherited from BindingManagerBase.) |
| Name | Description | |
|---|---|---|
![]() | finalType | Infrastructure. Specifies the data type of the list. |
![]() | listposition | Infrastructure. Specifies the current position of the CurrencyManager in the list. |
![]() | onCurrentChangedHandler | Specifies the event handler for the CurrentChanged event. (Inherited from BindingManagerBase.) |
![]() | onPositionChangedHandler | Specifies the event handler for the PositionChanged event. (Inherited from BindingManagerBase.) |
The CurrencyManager derives from the BindingManagerBase class. Use the BindingContext to return either a CurrencyManager or a PropertyManager. The actual object returned depends on the data source and data member passed to the Item property of the BindingContext. If the data source is an object that can return only a single property (instead of a list of objects), the type will be a PropertyManager. For example, if you specify a TextBox as the data source, a PropertyManager will be returned. If, on the other hand, the data source is an object that implements the IList, IListSource, or IBindingList interface, a CurrencyManager will be returned.
The Current property returns the current item in the underlying list. To change the current item, set the Position property to a new value. The value must be greater than 0 and must be less than the value of the Count property.
If the underlying data source implements the IBindingList interface, and the AllowNew property is set to true, you can use the AddNew method.
The following code example binds a TextBox control to a column in a DataTable, gets the CurrencyManager for the binding, and sets its position.
CurrencyManager^ myCurrencyManager; void BindControl( DataTable^ myTable ) { // Bind a TextBox control to a DataTable column in a DataSet. textBox1->DataBindings->Add( "Text", myTable, "CompanyName" ); // Specify the CurrencyManager for the DataTable. this->myCurrencyManager = dynamic_cast<CurrencyManager^>(this->BindingContext[ myTable ]); // Set the initial Position of the control. this->myCurrencyManager->Position = 0; } void MoveNext( CurrencyManager^ myCurrencyManager ) { if ( myCurrencyManager->Position == myCurrencyManager->Count - 1 ) { MessageBox::Show( "You're at end of the records" ); } else { myCurrencyManager->Position += 1; } } void MoveFirst( CurrencyManager^ myCurrencyManager ) { myCurrencyManager->Position = 0; } void MovePrevious( CurrencyManager^ myCurrencyManager ) { if ( myCurrencyManager->Position == 0 ) { MessageBox::Show( "You're at the beginning of the records." ); } else { myCurrencyManager->Position -= 1; } } void MoveLast( CurrencyManager^ myCurrencyManager ) { myCurrencyManager->Position = myCurrencyManager->Count - 1; }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
