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 # Class AttributeCollection

 Last update: 09.03.2026 

<a id="VM_Managed_AttributeCollection"></a>

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

This class is to represent the attribute collection.

```csharp
public sealed class AttributeCollection : LinkContainer, IObservableObject, IDisposableObject, ILinkable, IObject, ILinkContainer, IOwned, IHasID, IEventProvider, ILinkContainerEvent, IVerifiable

```

#### 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) ← [AttributeCollection](VM.Managed.AttributeCollection.md)

#### Implements

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

#### Inherited Members

[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.SetContainer(IOwned, bool)](VM.Managed.LinkContainer.md#VM_Managed_LinkContainer_SetContainer_VM_Models_Pre_IOwned_System_Boolean_), [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), ObservableObject.Dispose(), ObservableObject.RaisePropertyChanged(string), ObservableObject.RaisePropertyChanged(string, object, object), 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_AttributeCollection__ctor"></a> AttributeCollection()

Initializes a new instance of the  class.

```csharp
public AttributeCollection()

```

## Properties

### <a id="VM_Managed_AttributeCollection_Count"></a> Count

Gets the number of elements contained in the .

```csharp
public int Count { get; }

```

#### Property Value

int

### <a id="VM_Managed_AttributeCollection_IsExternable"></a> IsExternable

Gets a value indicating whether this instance is Externable.

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

```

#### Property Value

bool

### <a id="VM_Managed_AttributeCollection_Keys"></a> Keys

Gets an  containing the keys of the .

```csharp
public ICollection<string> Keys { get; }

```

#### Property Value

ICollection&lt;string&gt;

### <a id="VM_Managed_AttributeCollection_Values"></a> Values

Gets an  containing the values in the .

```csharp
public ICollection<AttributeBase> Values { get; }

```

#### Property Value

ICollection&lt;[AttributeBase](VM.Managed.AttributeBase.md)&gt;

### <a id="VM_Managed_AttributeCollection_Item_System_String_"></a> this\[string\]

```csharp
public AttributeBase this[string key] { get; set; }

```

#### Property Value

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

## Methods

### <a id="VM_Managed_AttributeCollection_Add_System_String_VM_Managed_AttributeBase_"></a> Add(string, AttributeBase)

Adds an element with the provided key and value to the .

```csharp
public void Add(string strKey, AttributeBase attr)

```

#### Parameters

`strKey` string

The object to use as the key of the element to add.

`attr` [AttributeBase](VM.Managed.AttributeBase.md)

The object to use as the value of the element to add.

#### Exceptions

ArgumentNullException

`strKey` is null.

ArgumentException

An element with the same key already exists in the .

NotSupportedException

The  is read-only.

### <a id="VM_Managed_AttributeCollection_Clear"></a> Clear()

Removes all items from the .

```csharp
public void Clear()

```

#### Exceptions

NotSupportedException

The  is read-only.

### <a id="VM_Managed_AttributeCollection_ContainsKey_System_String_"></a> ContainsKey(string)

Determines whether the  contains an element with the specified key.

```csharp
public bool ContainsKey(string strKey)

```

#### Parameters

`strKey` string

The key to locate in the .

#### Returns

bool

true if the  contains an element with the key; otherwise, false.

#### Exceptions

ArgumentNullException

`strKey` is null.

### <a id="VM_Managed_AttributeCollection_GetEnumerator"></a> GetEnumerator()

Returns an enumerator that iterates through the collection.

```csharp
public IEnumerator<KeyValuePair<string, AttributeBase>> GetEnumerator()

```

#### Returns

IEnumerator&lt;KeyValuePair&lt;string, [AttributeBase](VM.Managed.AttributeBase.md)&gt;&gt;

A  that can be used to iterate through the collection.

### <a id="VM_Managed_AttributeCollection_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 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_AttributeCollection_LinkRequestDestroy_System_Object_VM_Managed_LinkEventArgs_"></a> LinkRequestDestroy(object, LinkEventArgs)

Request for destroy the linked object.

```csharp
protected override sealed void LinkRequestDestroy(object obNotifier, LinkEventArgs arg)

```

#### Parameters

`obNotifier` object

The linked object.

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

The  instance containing the event data.

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

Request for update the linked object.

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

```

#### Parameters

`obNotifier` object

The linked object.

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

The  instance containing the event data.

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

Generates an object from its XML representation.

```csharp
public void ReadXml(XmlReader reader)

```

#### Parameters

`reader` XmlReader

The XmlReader stream from which the object is deserialized.

### <a id="VM_Managed_AttributeCollection_Remove_System_String_"></a> Remove(string)

Removes the element with the specified key from the .

```csharp
public bool Remove(string strKey)

```

#### Parameters

`strKey` string

The key of the element to remove.

#### Returns

bool

true if the element is successfully removed; otherwise, false. This method also returns false if `strKey` was not found in the original .

#### Exceptions

ArgumentNullException

`strKey` is null.

NotSupportedException

The  is read-only.

### <a id="VM_Managed_AttributeCollection_TryGetValue_System_String_VM_Managed_AttributeBase__"></a> TryGetValue(string, out AttributeBase)

Gets the value associated with the specified key.

```csharp
public bool TryGetValue(string strKey, out AttributeBase value)

```

#### Parameters

`strKey` string

The key whose value to get.

`value` [AttributeBase](VM.Managed.AttributeBase.md)

When this method returns, the value associated with the specified key, if the key is found; otherwise, the default value for the type of the `value` parameter. This parameter is passed uninitialized.

#### Returns

bool

true if the object that implements  contains an element with the specified key; otherwise, false.

#### Exceptions

ArgumentNullException

`strKey` is null.

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

Converts an object into its XML representation.

```csharp
public void WriteXml(XmlWriter writer)

```

#### Parameters

`writer` XmlWriter

The XmlWriter stream to which the object is serialized.