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 # Class DirectionExpression

 Last update: 09.03.2026 

<a id="VM_Managed_DirectionExpression"></a>

Namespace: [VM.Managed](VM.Managed.md)  
Assembly: VMAppCore.dll

This class is to represent the information of direction through expression(string) parsing.

```csharp
public class DirectionExpression : DirectionBase, IObservableObject, IDisposableObject, ILinkable, IObject, ILinkContainer, IOwned, IHasID, IEventProvider, ILinkContainerEvent, IVerifiable, IHasReplaceableEntity

```

#### Inheritance

object ← ObservableObject ← [LinkableBase](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/LinkableBase.cs) ← [LinkContainer](VM.Managed.LinkContainer.md) ← [DirectionBase](VM.Managed.DirectionBase.md) ← [DirectionExpression](VM.Managed.DirectionExpression.md)

#### Implements

IObservableObject, IDisposableObject, ILinkable, IObject, ILinkContainer, IOwned, IHasID, IEventProvider, [ILinkContainerEvent](VM.Managed.ILinkContainerEvent.md), [IVerifiable](VM.Managed.IVerifiable.md), IHasReplaceableEntity

#### Inherited Members

[DirectionBase.m\_bReverse](VM.Managed.DirectionBase.md#VM_Managed_DirectionBase_m_bReverse), [DirectionBase.IsParametric(Primitive.enRefType)](VM.Managed.DirectionBase.md#VM_Managed_DirectionBase_IsParametric_VM_Managed_Primitive_enRefType_), [DirectionBase.IsParametric(string)](VM.Managed.DirectionBase.md#VM_Managed_DirectionBase_IsParametric_System_String_), [DirectionBase.ReadXml(XmlReader)](VM.Managed.DirectionBase.md#VM_Managed_DirectionBase_ReadXml_System_Xml_XmlReader_), [DirectionBase.WriteXml(XmlWriter)](VM.Managed.DirectionBase.md#VM_Managed_DirectionBase_WriteXml_System_Xml_XmlWriter_), [DirectionBase.GetSchema()](VM.Managed.DirectionBase.md#VM_Managed_DirectionBase_GetSchema), [DirectionBase.HasReplaceableEntity(IObjectBase)](VM.Managed.DirectionBase.md#VM_Managed_DirectionBase_HasReplaceableEntity_VM_Models_Pre_IObjectBase_), [DirectionBase.ReplaceEntity(IObjectBase, IObjectBase)](VM.Managed.DirectionBase.md#VM_Managed_DirectionBase_ReplaceEntity_VM_Models_Pre_IObjectBase_VM_Models_Pre_IObjectBase_), [DirectionBase.Reverse](VM.Managed.DirectionBase.md#VM_Managed_DirectionBase_Reverse), [DirectionBase.IsParameterized](VM.Managed.DirectionBase.md#VM_Managed_DirectionBase_IsParameterized), [DirectionBase.Value](VM.Managed.DirectionBase.md#VM_Managed_DirectionBase_Value), [LinkContainer.SetModified()](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_SetModified), [LinkContainer.raise\_OnUpdating(object, LinkEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_raise_OnUpdating_System_Object_VM_Managed_LinkEventArgs_), [LinkContainer.raise\_OnUpdate(object, LinkEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_raise_OnUpdate_System_Object_VM_Managed_LinkEventArgs_), [LinkContainer.raise\_OnDestroying(object, LinkEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_raise_OnDestroying_System_Object_VM_Managed_LinkEventArgs_), [LinkContainer.raise\_OnDestroy(object, LinkEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_raise_OnDestroy_System_Object_VM_Managed_LinkEventArgs_), [LinkContainer.raise\_OnAdded(object, AddToDocEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_raise_OnAdded_System_Object_VM_Managed_AddToDocEventArgs_), [LinkContainer.raise\_OnRemoved(object, RemoveFromDocEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_raise_OnRemoved_System_Object_VM_Managed_RemoveFromDocEventArgs_), [LinkContainer.GetTargetListForUpdate()](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_GetTargetListForUpdate), [LinkContainer.SkipUpdateObjectImpl()](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_SkipUpdateObjectImpl), [LinkContainer.Initialize(Unit.ConvertFactor)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_Initialize_VM_Unit_ConvertFactor_), [LinkContainer.SetFlagWhenXMLFile(string, bool)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_SetFlagWhenXMLFile_System_String_System_Boolean_), [LinkContainer.IsSerializableEvent(Delegate)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_IsSerializableEvent_System_Delegate_), [LinkContainer.CustomGetObjectData(SerializationInfo, StreamingContext)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_CustomGetObjectData_System_Runtime_Serialization_SerializationInfo_System_Runtime_Serialization_StreamingContext_), [LinkContainer.GetSerializedData(SerializationInfo, StreamingContext)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_GetSerializedData_System_Runtime_Serialization_SerializationInfo_System_Runtime_Serialization_StreamingContext_), [LinkContainer.LinkRequestUpdating(object, LinkEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_LinkRequestUpdating_System_Object_VM_Managed_LinkEventArgs_), [LinkContainer.LinkRequestUpdate(object, LinkEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_LinkRequestUpdate_System_Object_VM_Managed_LinkEventArgs_), [LinkContainer.LinkRequestDestroying(object, LinkEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_LinkRequestDestroying_System_Object_VM_Managed_LinkEventArgs_), [LinkContainer.LinkRequestDestroy(object, LinkEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_LinkRequestDestroy_System_Object_VM_Managed_LinkEventArgs_), [LinkContainer.LinkAddedToDocument(object, AddToDocEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_LinkAddedToDocument_System_Object_VM_Managed_AddToDocEventArgs_), [LinkContainer.LinkRemovedFromDocument(object, RemoveFromDocEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_LinkRemovedFromDocument_System_Object_VM_Managed_RemoveFromDocEventArgs_), [LinkContainer.OnLinkReserved(ILink, object, EventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_OnLinkReserved_VM_Managed_ILink_System_Object_System_EventArgs_), [LinkContainer.CanBeDestroy(object)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_CanBeDestroy_System_Object_), [LinkContainer.DisposeManagedResources()](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_DisposeManagedResources), [LinkContainer.SetContainer(IOwned, bool)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_SetContainer_VM_Models_Pre_IOwned_System_Boolean_), [LinkContainer.OnChildUpdated(object, LinkEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_OnChildUpdated_System_Object_VM_Managed_LinkEventArgs_), [LinkContainer.OnContainerDestroy(object, LinkEventArgs)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_OnContainerDestroy_System_Object_VM_Managed_LinkEventArgs_), [LinkContainer.OnDeserialization(object)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_OnDeserialization_System_Object_), [LinkContainer.Verify(VerifiedResult)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_Verify_VM_Managed_VerifiedResult_), [LinkContainer.GetCopy(object)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_GetCopy_System_Object_), [LinkContainer.Dispose(bool)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_Dispose_System_Boolean_), [LinkContainer.ClearChildInfoBeforeDeserialize](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_ClearChildInfoBeforeDeserialize), [LinkContainer.Container](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_Container), [LinkContainer.Owner](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_Owner), [LinkContainer.Document](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_Document), [LinkContainer.ID](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_ID), [LinkContainer.IsChildExternable](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_IsChildExternable), [LinkContainer.IsExternable](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_IsExternable), [LinkContainer.OnRemoved](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_OnRemoved), [LinkContainer.OnAdded](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_OnAdded), [LinkContainer.OnDestroy](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_OnDestroy), [LinkContainer.OnDestroying](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_OnDestroying), [LinkContainer.OnUpdate](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_OnUpdate), [LinkContainer.OnUpdating](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_OnUpdating), [LinkableBase.OnDeserialization(object)](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/LinkableBase.cs), ObservableObject.Dispose(), ObservableObject.RaisePropertyChanged(string), ObservableObject.RaisePropertyChanged(string, object, object), ObservableObject.Dispose(bool), ObservableObject.DisposeManagedResources(), ObservableObject.DisposeUnmanagedResources(), ObservableObject.IsDisposed, ObservableObject.TryDisposing, ObservableObject.Disposed, ObservableObject.Disposing, ObservableObject.PropertyChanged

#### Extension Methods

[LinkPropertyItemCache.GetLinkProperties(object, LinkPropertyType)](VM.Models.Pre.Cache.LinkPropertyItemCache.md#VM_Models_Pre_Cache_LinkPropertyItemCache_GetLinkProperties_System_Object_VM_Models_Pre_LinkPropertyType_), [LinkPropertyItemCache.GetLinkPropertiesAndValues(object, LinkPropertyType)](VM.Models.Pre.Cache.LinkPropertyItemCache.md#VM_Models_Pre_Cache_LinkPropertyItemCache_GetLinkPropertiesAndValues_System_Object_VM_Models_Pre_LinkPropertyType_), [LinkPropertyItemCache.GetLinkedObjects&lt;T&gt;(object, LinkPropertyType)](VM.Models.Pre.Cache.LinkPropertyItemCache.md#VM_Models_Pre_Cache_LinkPropertyItemCache_GetLinkedObjects__1_System_Object_VM_Models_Pre_LinkPropertyType_)

## Constructors

### <a id="VM_Managed_DirectionExpression__ctor_VM_Managed_VectorBase_"></a> DirectionExpression(VectorBase)

Initializes a new instance of the  class.

```csharp
public DirectionExpression(VectorBase vecPosition)

```

#### Parameters

`vecPosition` [VectorBase](VM.Managed.VectorBase.md)

Value of position.

### <a id="VM_Managed_DirectionExpression__ctor"></a> DirectionExpression()

Initializes a new instance of the  class.

```csharp
public DirectionExpression()

```

## Properties

### <a id="VM_Managed_DirectionExpression_Expression"></a> Expression

Gets or sets the value of direction.

```csharp
protected Direction Expression { get; set; }

```

#### Property Value

[Direction](VM.Managed.Direction.md)

### <a id="VM_Managed_DirectionExpression_IsParameterized"></a> IsParameterized

Gets the parametric.

```csharp
public override bool IsParameterized { get; }

```

#### Property Value

bool

### <a id="VM_Managed_DirectionExpression_Value"></a> Value

Gets the VectorBase(x, y, z).

```csharp
public override VectorBase Value { get; }

```

#### Property Value

[VectorBase](VM.Managed.VectorBase.md)

## Methods

### <a id="VM_Managed_DirectionExpression_GetSchema"></a> GetSchema()

This method is reserved and should not be used. When implementing the IXmlSerializable interface, you should return nullNothingnullptra null reference (Nothing in Visual Basic) (Nothing in Visual Basic) from this method, and instead, if specifying a custom schema is required, apply the XmlSchemaProviderAttribute to the class.

```csharp
public override XmlSchema GetSchema()

```

#### Returns

XmlSchema

An  that describes the XML representation of the object that is produced by the  method and consumed by the  method.

### <a id="VM_Managed_DirectionExpression_IsParametric_VM_Managed_Primitive_enRefType_"></a> IsParametric(enRefType)

Gets parametric.

```csharp
public override bool IsParametric(Primitive.enRefType type)

```

#### Parameters

`type` [Primitive](VM.Managed.Primitive.md).[enRefType](VM.Managed.Primitive.enRefType.md)

Point picking type.

#### Returns

bool

If set to `true` is parametric; otherwise, `false` is none parametric.

### <a id="VM_Managed_DirectionExpression_LinkRequestUpdate_System_Object_VM_Managed_LinkEventArgs_"></a> LinkRequestUpdate(object, LinkEventArgs)

The update event occured from the linked object.

```csharp
protected override void LinkRequestUpdate(object objNotifier, LinkEventArgs arg)

```

#### Parameters

`objNotifier` object

The linked object.

`arg` [LinkEventArgs](VM.Managed.LinkEventArgs.md)

The update event information.

### <a id="VM_Managed_DirectionExpression_ReadXml_System_Xml_XmlReader_"></a> ReadXml(XmlReader)

Generates an object from its XML representation.

```csharp
public override void ReadXml(XmlReader reader)

```

#### Parameters

`reader` XmlReader

The XmlReader stream from which the object is deserialized.

### <a id="VM_Managed_DirectionExpression_Set_System_String_"></a> Set(string)

sets the expression.

```csharp
public void Set(string strDirection)

```

#### Parameters

`strDirection` string

Value of direction.

### <a id="VM_Managed_DirectionExpression_WriteXml_System_Xml_XmlWriter_"></a> WriteXml(XmlWriter)

Converts an object into its XML representation.

```csharp
public override void WriteXml(XmlWriter writer)

```

#### Parameters

`writer` XmlWriter

The XmlWriter stream to which the object is serialized.