> For the complete documentation index, see [llms.txt](https://docs.wisej.com/ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wisej.com/ai/components/api/smartsession/wisej.ai.smartsession.messagecollection.md).

# SmartSession.MessageCollection

Namespace: **Wisej.AI**

Assembly: **Wisej.AI** (3.5.0.0)

Represents a collection of messages in a session.

{% tabs %}
{% tab title="C#" %}

```csharp
public class MessageCollection : ObservableCollection<>, ICloneable
```

{% endtab %}

{% tab title="VB.NET" %}

```visual-basic
Public Class MessageCollection
    Inherits ObservableCollection(Of )
    Implements ICloneable
```

{% endtab %}
{% endtabs %}

## Constructors

### ![](/files/ptrKjmmRoQB76pvrIqh0) MessageCollection()

Initializes a new instance of [MessageCollection](/ai/components/api/smartsession/wisej.ai.smartsession.messagecollection.md).

## Methods

### ![](/files/ptrKjmmRoQB76pvrIqh0) Add(role, content)

Adds a message with the specified role and content.

| Parameter   | Type                                                                                | Description                 |
| ----------- | ----------------------------------------------------------------------------------- | --------------------------- |
| **role**    | [MessageRole](/ai/components/api/smartsession/wisej.ai.smartsession.messagerole.md) | The role of the message.    |
| **content** | [String](https://docs.microsoft.com/dotnet/api/system.string)                       | The content of the message. |

**Returns:** [MessageCollection](/ai/components/api/smartsession/wisej.ai.smartsession.messagecollection.md). The current [MessageCollection](/ai/components/api/smartsession/wisej.ai.smartsession.messagecollection.md) instance.

**Throws:**

* [ArgumentNullException](https://docs.microsoft.com/dotnet/api/system.argumentnullexception)\
  Thrown when the content is null.

### ![](/files/ptrKjmmRoQB76pvrIqh0) AddRange(messages)

Adds a range of messages to the collection.

| Parameter    | Type                                                                                        | Description          |
| ------------ | ------------------------------------------------------------------------------------------- | -------------------- |
| **messages** | [IList\<Message>](https://docs.microsoft.com/dotnet/api/system.collections.generic.ilist-1) | The messages to add. |

**Returns:** [MessageCollection](/ai/components/api/smartsession/wisej.ai.smartsession.messagecollection.md). The current [MessageCollection](/ai/components/api/smartsession/wisej.ai.smartsession.messagecollection.md) instance.

### ![](/files/ptrKjmmRoQB76pvrIqh0) Clone()

Creates a shallow clone of the collection.

**Returns:** [MessageCollection](/ai/components/api/smartsession/wisej.ai.smartsession.messagecollection.md). A shallow clone of the [MessageCollection](/ai/components/api/smartsession/wisej.ai.smartsession.messagecollection.md).

### ![](/files/KL0Ik37djZRr8a07Wopd) InsertItem(index, item)

Inserts a message at the specified index.

| Parameter | Type                                                                        | Description                                                   |
| --------- | --------------------------------------------------------------------------- | ------------------------------------------------------------- |
| **index** | [Int32](https://docs.microsoft.com/dotnet/api/system.int32)                 | The zero-based index at which the message should be inserted. |
| **item**  | [Message](/ai/components/api/smartsession/wisej.ai.smartsession.message.md) | The message to insert.                                        |

### ![](/files/KL0Ik37djZRr8a07Wopd) MoveItem(oldIndex, newIndex)

Moves a message from one index to another.

| Parameter    | Type                                                        | Description                                                |
| ------------ | ----------------------------------------------------------- | ---------------------------------------------------------- |
| **oldIndex** | [Int32](https://docs.microsoft.com/dotnet/api/system.int32) | The zero-based index specifying the location to move from. |
| **newIndex** | [Int32](https://docs.microsoft.com/dotnet/api/system.int32) | The zero-based index specifying the location to move to.   |

### ![](/files/ptrKjmmRoQB76pvrIqh0) RemoveAll(predicate)

Removes all messages that match the specified predicate.

| Parameter     | Type                                                                            | Description                      |
| ------------- | ------------------------------------------------------------------------------- | -------------------------------- |
| **predicate** | [Predicate\<Message>](https://docs.microsoft.com/dotnet/api/system.predicate-1) | The predicate to match messages. |

**Returns:** [MessageCollection](/ai/components/api/smartsession/wisej.ai.smartsession.messagecollection.md). The current [MessageCollection](/ai/components/api/smartsession/wisej.ai.smartsession.messagecollection.md) instance.

### ![](/files/ptrKjmmRoQB76pvrIqh0) RemoveLast(count)

Removes the last message(s) from the collection.

| Parameter                                  | Type                                                        | Description                                     |
| ------------------------------------------ | ----------------------------------------------------------- | ----------------------------------------------- |
| **count** ![](/files/52BqKf9SltWQ97FbQSBF) | [Int32](https://docs.microsoft.com/dotnet/api/system.int32) | The number of messages to remove. Default is 1. |

**Returns:** [MessageCollection](/ai/components/api/smartsession/wisej.ai.smartsession.messagecollection.md). The current [MessageCollection](/ai/components/api/smartsession/wisej.ai.smartsession.messagecollection.md) instance.


---

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