OPC Studio User's Guide and Reference
TopicRead Property (EasyDAClientHoldPeriods)



OpcLabs.EasyOpcClassicCore Assembly > OpcLabs.EasyOpc.DataAccess.Engine Namespace > EasyDAClientHoldPeriods Class : TopicRead Property
After an item read call, connection to an OPC item will be maintained at least for the time period specified here.
Syntax
'Declaration
 
<DataMemberAttribute()>
<ValueRangeAttribute(0, 2147483647)>
Public Property TopicRead As Integer
'Usage
 
Dim instance As EasyDAClientHoldPeriods
Dim value As Integer
 
instance.TopicRead = value
 
value = instance.TopicRead
[DataMember()]
[ValueRange(0, 2147483647)]
public int TopicRead {get; set;}
[DataMember()]
[ValueRange(0, 2147483647)]
public:
property int TopicRead {
   int get();
   void set (    int value);
}

Property Value

Valid values of this property are in the range from 0 to 2147483647 (Int32.MaxValue).

The default value of this property is 30000.

Exceptions
ExceptionDescription

The value of an argument is outside the allowable range of values as defined by the invoked method.

This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

Remarks

This property is used by following client implementations:

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