The following tables list the members exposed by DAGroup.
Public Constructors
| Name | Description | |
|---|---|---|
 | DAGroup Constructor | Overloaded. |
Public Properties
| Name | Description | |
|---|---|---|
 | AsyncCallbacksEnabled | Determines wether the group enables the server callback handling for asynchronous handling |
| AsyncWriteTimeLimit | Determines the time limit in seconds for asyncchronous write responses. |
| ClientHandle | Group Client Handle. This handle is only used in special situations. |
| Container | (Inherited from System.ComponentModel.Component) |
| DAServer | The OPC server defined in this object is accessed for all subscriptions handled by this control. |
| Error | Indicates that the group could not be correctle created in the server. |
| Grp | The BGGroup object used by this control. The BGGroup class handles the OPC server access in background threads using methods of the OpcGroup class. |
| InitialActiveState | Initial active state of the group. |
| IsCreated | True if the associated group is created in the server. |
| ItemDefinitionSets | Sets of item defintions for read/write calls. The collection contains a number of DAItemSet object. Each DAItemSet object contains a DAItemValue collection that can be used in Read/Write calls. |
| ItemNames | OPC items added to this group. |
| Items | OPC items added to this group. |
| KeepAliveRate | KeepAlive feature of OPC DA V3 servers. A get returns the revised rate of the last set call. A value of 0 disables or indicates a disabled KeepAlive handling. Errors are reported in the Notification event. |
| Name | Group Name in server. The name can be empty and is used mainly for debug purposes. |
| OwnerForm | The Form object that uses this control and requires thread synchronization. |
| Site | (Inherited from System.ComponentModel.Component) |
| Tag | User defined data asociated with the object. |
| UpdRateRequested | Defines the requested fastest rate [ms] of OPC server callbacks. |
| UpdRateRevised | The actual fastest rate [ms] of OPC server callbacks. |
Protected Properties
| Name | Description | |
|---|---|---|
 | CanRaiseEvents | (Inherited from System.ComponentModel.Component) |
| DesignMode | (Inherited from System.ComponentModel.Component) |
| Events | (Inherited from System.ComponentModel.Component) |
Public Methods
| Name | Description | |
|---|---|---|
 | Create | Available in the OPCDA.NET Professional Edition only. The group is added to the OPC server according the settings and the processsing is started. The associated DAServer id Connected if it isn't already. This is the only initailization call necessary to start the processing. The call returns after the request is queued. The processing is handled asynchronously. Completion and errors are reported in the specified completion event handler. If no completion handler is specified then error are reported in the Notification event handler of the associated DAServer object. |
| CreateObjRef | Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from System.MarshalByRefObject) |
| Dispose | Overloaded. Overridden. Clean up any resources being used. |
| GetLifetimeService | Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from System.MarshalByRefObject) |
| InitializeLifetimeService | Obtains a lifetime service object to control the lifetime policy for this instance. (Inherited from System.MarshalByRefObject) |
| Read | Available in the OPCDA.NET Professional Edition only. Read a set of items by executing an asynchronous read call in the background thread of the BGGroup class. The call returns immediately after the request is queued. The success of the call is reported in the completion event handler arguments. Complete failure is indicated in the exception argument. Error reading certain items are reported in the Error field of the rslt object. |
| Remove | Available in the OPCDA.NET Professional Edition only. This operation is stopped and the group is removed in the OPC server. The group can be reactivated by calling the Create() method again. The call returns after the request is queued. The processing is handled asynchronously. Completion and errors are reported in the specified completion event handler. If no completion handler is specified then error are reported in the Notification event handler of the associated DAServer object. |
| ToString | (Inherited from System.ComponentModel.Component) |
| Write | Available in the OPCDA.NET Professional Edition only. Write a set of items by executing an asynchronous write call in a background thread of the BGGroup class. The call returns immediately after the request is queued. The success of the write call is reported in the completion event handler arguments. Complete failure is indicated in the exception argument. Error writing certain items are reported in the Error field of the rslt object. |
Protected Methods
| Name | Description | |
|---|---|---|
 | Finalize | (Inherited from System.ComponentModel.Component) |
| GetService | (Inherited from System.ComponentModel.Component) |
| MemberwiseClone | Overloaded. Creates a shallow copy of the current System.MarshalByRefObject object. (Inherited from System.MarshalByRefObject) |
Public Events
| Name | Description | |
|---|---|---|
 | DataChanged | |
| Disposed | (Inherited from System.ComponentModel.Component) |