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 ConstructorDAItemDescriptor ConstructorOverloaded. Initializes a new instance of the DAItemDescriptor class.  
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Public Fields
 NameDescription
Public FieldDefaultAccessPathDefault access path. An empty string.  
Public FieldDefaultRequestedDataTypeDefault requested data type. Equals to OpcLabs.BaseLib.ComInterop.VarTypes.Empty.  
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Public Properties
 NameDescription
Public PropertyAccessPathSpecifies the access path for the OPC item. The default is "" (an empty string).  
Public PropertyAliasNameWhen non-empty, specifies the name of the alias that will be used in place of this object. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyArgumentStringThe node descriptor in form of an argument string, i.e. a key=value pairs separated by semicolons. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyBrowsePathSpecifies the browse path for the OPC node. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyBrowsePathStartingNodeDescriptorThe starting node descriptor of the browse path. (Inherited from OpcLabs.EasyOpc.DataAccess.DANodeDescriptor)
Public PropertyHasBrowsePathDetermines whether there is a non-null browse path in the descriptor. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyHasNodeIdDetermines whether there is a non-null node ID in the descriptor. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyIsAliasedDetermines whether this object is aliased. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyIsNullDetermines whether the node descriptor is null, i.e. specifies neither node ID nor a browse path. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyIsRootDetermines whether this object describes a root of the address space. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyItemIdContains OPC item identifier (empty string for the root, null reference if unknown). (Inherited from OpcLabs.EasyOpc.DataAccess.DANodeDescriptor)
Public PropertyNodeIdContains node identifier (empty string for the root, null reference if unknown). (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public PropertyNodePathContains 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)NullA null item descriptor (contains a null node ID and a null browse path).  
Public PropertyRequestedDataTypeSpecifies 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 MethodCloneOverridden.   
Public MethodEqualsOverloaded. Determines whether the specified DAItemDescriptor is equal to the current object.  
Public MethodFlattenOverloaded. Computes an equivalent node descriptor that is flattened. (Inherited from OpcLabs.EasyOpc.DataAccess.DANodeDescriptor)
Public Methodstatic (Shared in Visual Basic)FromDANodeDescriptorConverts a node descriptor a DAItemDescriptor object.  
Public Methodstatic (Shared in Visual Basic)FromDANodeElementConverts a OpcLabs.EasyOpc.DataAccess.AddressSpace.DANodeElement to a DAItemDescriptor object.  
Public Methodstatic (Shared in Visual Basic)FromStringConverts a string containing an item Id to a DAItemDescriptor object.  
Public MethodGetHashCodeOverridden. Serves as the default hash function. Serves as a hash function for a particular type.  
Public MethodGetObjectDataOverridden.   
Public MethodGetSchema (Inherited from OpcLabs.BaseLib.Info)
Public MethodGetTypeGets the System.Type of the current instance. (Inherited from object)
Public MethodMatchDetermines whether the node descriptor matches another node descriptor. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public MethodReadStringList (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public MethodReadXml (Inherited from OpcLabs.BaseLib.Info)
Public MethodToStringReturns 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 MethodWriteStringList (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Public MethodWriteXml (Inherited from OpcLabs.BaseLib.Info)
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Protected Methods
 NameDescription
Protected MethodDeserializeNodeDescriptorIfPresentInfrastructure. Infrastructure. (Inherited from OpcLabs.EasyOpc.DataAccess.DANodeDescriptor)
Protected MethodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from object)
Protected MethodGetNodeIdArgumentNameInfrastructure. Infrastructure. (Inherited from OpcLabs.EasyOpc.DataAccess.DANodeDescriptor)
Protected MethodMakeArgumentStringOverridden. Infrastructure. Infrastructure.  
Protected MethodMemberwiseCloneCreates a shallow copy of the current System.Object. (Inherited from object)
Protected MethodOnPropertyChangedInfrastructure. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
Protected MethodReadXmlElementOverridden. Infrastructure. Infrastructure. Infrastructure.  
Protected MethodSerializeNodeDescriptorIfNotNullInfrastructure. Infrastructure. (Inherited from OpcLabs.EasyOpc.DataAccess.DANodeDescriptor)
Protected MethodWriteXmlElementOverridden. Infrastructure. Infrastructure. Infrastructure.  
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Public Events
 NameDescription
Public EventPropertyChangedThis event is raised when a property is changed on a component. (Inherited from OpcLabs.EasyOpc.NodeDescriptor)
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Public Operators
public Operator Equality Determines whether the two objects are equal.
public Operator Implicit Type Conversion Overloaded. Converts a string containing an item Id to a DAItemDescriptor object.
public Operator Inequality Determines whether the two objects are not equal.
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See Also

Reference

DAItemDescriptor Class
OpcLabs.EasyOpc.DataAccess Namespace

 

 

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