OPC Studio User's Guide and Reference
WhereClause Property (UAEventFilterBuilder)



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA Namespace > UAEventFilterBuilder Class : WhereClause Property
The criteria limiting the Notifications.
Syntax
'Declaration
 
<CanBeNullAttribute()>
Public Property WhereClause As UAContentFilterElement
'Usage
 
Dim instance As UAEventFilterBuilder
Dim value As UAContentFilterElement
 
instance.WhereClause = value
 
value = instance.WhereClause
[CanBeNull()]
public UAContentFilterElement WhereClause {get; set;}
[CanBeNull()]
public:
property UAContentFilterElement^ WhereClause {
   UAContentFilterElement^ get();
   void set (    UAContentFilterElement^ value);
}

Property Value

This value of this property can be null (Nothing in Visual Basic).

Remarks

Because the OpcLabs.EasyOpc.UA.Filtering.UAContentFilterElementBuilder has an implicit conversion to OpcLabs.EasyOpc.UA.Filtering.UAContentFilterElement, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a OpcLabs.EasyOpc.UA.Filtering.UAContentFilterElementBuilder in place of OpcLabs.EasyOpc.UA.Filtering.UAContentFilterElement value when setting this property, and the corresponding OPC UA content filter element will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can convert a OpcLabs.EasyOpc.UA.Filtering.UAContentFilterElementBuilder to OpcLabs.EasyOpc.UA.Filtering.UAContentFilterElement using the OpcLabs.EasyOpc.UA.Filtering.UAContentFilterElementBuilder.ToUAContentFilterElement static method instead.

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

See Also