OPC Studio User's Guide and Reference
DAItemDescriptor Class Members
Fields  Properties  Methods  Events


OpcLabs.EasyOpcClassicCore Assembly > OpcLabs.EasyOpc.DataAccess Namespace : DAItemDescriptor Class

The following tables list the members exposed by DAItemDescriptor.

Public Constructors
 NameDescription
Public ConstructorOverloaded. Initializes a new instance of the DAItemDescriptor class.  
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Public Fields
 NameDescription
Public FieldDefault access path. An empty string.  
Public FieldDefault requested data type. Equals to OpcLabs.BaseLib.ComInterop.VarTypes.Empty.  
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Public Properties
 NameDescription
Public PropertySpecifies the access path for the OPC item. The default is "" (an empty string).  
Public PropertyWhen non-empty, specifies the name of the alias that will be used in place of this object. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyThe node descriptor in form of an argument string, i.e. a key=value pairs separated by semicolons. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertySpecifies the browse path for the OPC node. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyThe starting node descriptor of the browse path. (Inherited from OpcLabs.EasyOpc.DataAccess.DANodeDescriptor)
Public PropertyDetermines whether there is a non-null browse path in the descriptor. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyDetermines whether there is a non-null node ID in the descriptor. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyDetermines whether this object is aliased. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyDetermines whether the node descriptor is null, i.e. specifies neither node ID nor a browse path. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyDetermines whether this object describes a root of the address space. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyContains OPC item identifier (empty string for the root, null reference if unknown). (Inherited from OpcLabs.EasyOpc.DataAccess.DANodeDescriptor)
Public PropertyContains node identifier (empty string for the root, null reference if unknown). (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyContains node path (empty string for the root, null reference if unknown). Only used with OPC XML. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public Propertystatic (Shared in Visual Basic)A null item descriptor (contains a null node ID and a null browse path).  
Public PropertySpecifies the data type requested. Setting this property to OpcLabs.BaseLib.ComInterop.VarTypes.Empty means that the server's canonical data type should be used.  
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Public Methods
 NameDescription
Public MethodOverridden.   
Public MethodOverloaded. Determines whether the specified DAItemDescriptor is equal to the current object.  
Public MethodOverloaded. Computes an equivalent node descriptor that is flattened. (Inherited from OpcLabs.EasyOpc.DataAccess.DANodeDescriptor)
Public Methodstatic (Shared in Visual Basic)Converts a node descriptor a DAItemDescriptor object.  
Public Methodstatic (Shared in Visual Basic)Converts a OpcLabs.EasyOpc.DataAccess.AddressSpace.DANodeElement to a DAItemDescriptor object.  
Public Methodstatic (Shared in Visual Basic)Converts a string containing an item Id to a DAItemDescriptor object.  
Public MethodOverridden. Serves as the default hash function. Serves as a hash function for a particular type.  
Public MethodOverridden.   
Public Method (Inherited from OpcLabs.BaseLib.Info)
Public MethodGets the System.Type of the current instance. (Inherited from object)
Public MethodDetermines whether the node descriptor matches another node descriptor. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public Method (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public Method (Inherited from OpcLabs.BaseLib.Info)
Public MethodReturns a string that represents the current object.Returns a string that represents the current object.Returns a string describing the contents of the node descriptor. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public Method (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public Method (Inherited from OpcLabs.BaseLib.Info)
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Protected Methods
 NameDescription
Protected MethodInfrastructure. Infrastructure. (Inherited from OpcLabs.EasyOpc.DataAccess.DANodeDescriptor)
Protected MethodAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from object)
Protected MethodInfrastructure. Infrastructure. (Inherited from OpcLabs.EasyOpc.DataAccess.DANodeDescriptor)
Protected MethodOverridden. Infrastructure. Infrastructure.  
Protected MethodCreates a shallow copy of the current System.Object. (Inherited from object)
Protected MethodInfrastructure. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Protected MethodOverridden. Infrastructure. Infrastructure. Infrastructure.  
Protected MethodInfrastructure. Infrastructure. (Inherited from OpcLabs.EasyOpc.DataAccess.DANodeDescriptor)
Protected MethodOverridden. Infrastructure. Infrastructure. Infrastructure.  
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Public Events
 NameDescription
Public EventThis event is raised when a property is changed on a component. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
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Public Operators
Determines whether the two objects are equal.
Overloaded. Converts a string containing an item Id to a DAItemDescriptor object.
Determines whether the two objects are not equal.
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See Also

Reference

DAItemDescriptor Class
OpcLabs.EasyOpc.DataAccess Namespace