# OnceTrigger Constructor

## Overloads

| [OnceTrigger()](https://help.qlik.com/en-US/qlikview-developer/September2026/Subsystems/QMSAPIref/Content/PIX.Triggers.OnceTrigger.-ctor.htm#PIX_Triggers_OnceTrigger__ctor) |  |  |
| --- | --- | --- |
| [OnceTrigger(XmlReader)](https://help.qlik.com/en-US/qlikview-developer/September2026/Subsystems/QMSAPIref/Content/PIX.Triggers.OnceTrigger.-ctor.htm#PIX_Triggers_OnceTrigger__ctor_System_Xml_XmlReader_) |  |  |
| [OnceTrigger(DateTime)](https://help.qlik.com/en-US/qlikview-developer/September2026/Subsystems/QMSAPIref/Content/PIX.Triggers.OnceTrigger.-ctor.htm#PIX_Triggers_OnceTrigger__ctor_System_DateTime_) |  |  |

[](https://help.qlik.com/en-US/qlikview-developer/Subsystems/QMSAPIref/Content/PIX.Triggers.OnceTrigger.-ctor.htm) [](https://help.qlik.com/en-US/qlikview-developer/Subsystems/QMSAPIref/Content/PIX.Triggers.OnceTrigger.-ctor.htm)

## OnceTrigger()

### Declaration

```

          public OnceTrigger()
    
  
```

[](https://help.qlik.com/en-US/qlikview-developer/Subsystems/QMSAPIref/Content/PIX.Triggers.OnceTrigger.-ctor.htm) [](https://help.qlik.com/en-US/qlikview-developer/Subsystems/QMSAPIref/Content/PIX.Triggers.OnceTrigger.-ctor.htm)

## OnceTrigger(XmlReader)

### Declaration

```

          public OnceTrigger(XmlReader reader)
    
  
```

### Parameters

| Type | Name | Description |
| --- | --- | --- |
| System.Xml.XmlReader | reader |  |

[](https://help.qlik.com/en-US/qlikview-developer/Subsystems/QMSAPIref/Content/PIX.Triggers.OnceTrigger.-ctor.htm) [](https://help.qlik.com/en-US/qlikview-developer/Subsystems/QMSAPIref/Content/PIX.Triggers.OnceTrigger.-ctor.htm)

## OnceTrigger(DateTime)

### Declaration

```
public OnceTrigger(DateTime i_StartAt)
```

### Parameters

| Type | Name | Description |
| --- | --- | --- |
| System.DateTime | i\_StartAt |  |