> 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/markup/wisej.ai.markupextensions.md).

# MarkupExtensions

Namespace: **Wisej.AI**

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

Provides extension methods for configuring and handling events on SmartEndpoint, SmartHttpEndpoint, SmartHub, and SmartSession objects.

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

```csharp
public class MarkupExtensions
```

{% endtab %}

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

```visual-basic
Public Class MarkupExtensions
```

{% endtab %}
{% endtabs %}

The [MarkupExtensions](/ai/components/api/markup/wisej.ai.markupextensions.md) class offers a fluent API for setting properties and subscribing to events on various smart endpoint and session types. These extension methods enable concise and readable configuration of endpoints and event handlers.

## Methods

### ![](/files/6srAlWaUVvAWWpvmGKFp) ApiKey\<T>(endpoint, value)

Sets the API key for the specified HTTP endpoint.

| Parameter    | Type                                                          | Description                                                                                                        |
| ------------ | ------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------ |
| **T**        |                                                               | A type derived from [SmartHttpEndpoint](/ai/components/api/smartendpoint/wisej.ai.endpoints.smarthttpendpoint.md). |
| **endpoint** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)   | The HTTP endpoint to configure.                                                                                    |
| **value**    | [String](https://docs.microsoft.com/dotnet/api/system.string) | The API key.                                                                                                       |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured HTTP endpoint instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) Authentication\<T>(endpoint, value)

Sets the authentication string for the specified HTTP endpoint.

| Parameter    | Type                                                          | Description                                                                                                        |
| ------------ | ------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------ |
| **T**        |                                                               | A type derived from [SmartHttpEndpoint](/ai/components/api/smartendpoint/wisej.ai.endpoints.smarthttpendpoint.md). |
| **endpoint** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)   | The HTTP endpoint to configure.                                                                                    |
| **value**    | [String](https://docs.microsoft.com/dotnet/api/system.string) | The authentication string.                                                                                         |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured HTTP endpoint instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) ContextWindow\<T>(endpoint, value)

Sets the context window size for the specified endpoint.

| Parameter    | Type                                                        | Description                                                               |
| ------------ | ----------------------------------------------------------- | ------------------------------------------------------------------------- |
| **T**        |                                                             | A type derived from [SmartEndpoint](/ai/components/api/smartendpoint.md). |
| **endpoint** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md) | The endpoint to configure.                                                |
| **value**    | [Int32](https://docs.microsoft.com/dotnet/api/system.int32) | The context window size.                                                  |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured endpoint instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) EmbeddingModel\<T>(endpoint, value)

Sets the embedding model for the specified endpoint.

| Parameter    | Type                                                          | Description                                                               |
| ------------ | ------------------------------------------------------------- | ------------------------------------------------------------------------- |
| **T**        |                                                               | A type derived from [SmartEndpoint](/ai/components/api/smartendpoint.md). |
| **endpoint** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)   | The endpoint to configure.                                                |
| **value**    | [String](https://docs.microsoft.com/dotnet/api/system.string) | The embedding model name.                                                 |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured endpoint instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) Headers\<T>(endpoint, value)

Sets the HTTP headers for the specified HTTP endpoint.

| Parameter    | Type                                                                                                            | Description                                                                                                                               |
| ------------ | --------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------- |
| **T**        |                                                                                                                 | A type derived from [SmartHttpEndpoint](/ai/components/api/smartendpoint/wisej.ai.endpoints.smarthttpendpoint.md).                        |
| **endpoint** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)                                                     | The HTTP endpoint to configure.                                                                                                           |
| **value**    | [NameValueCollection](https://docs.microsoft.com/dotnet/api/system.collections.specialized.namevaluecollection) | A [NameValueCollection](https://docs.microsoft.com/dotnet/api/system.collections.specialized.namevaluecollection) containing the headers. |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured HTTP endpoint instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) MaxOutputTokens\<T>(endpoint, value)

Sets the maximum number of output tokens for the specified endpoint.

| Parameter    | Type                                                        | Description                                                               |
| ------------ | ----------------------------------------------------------- | ------------------------------------------------------------------------- |
| **T**        |                                                             | A type derived from [SmartEndpoint](/ai/components/api/smartendpoint.md). |
| **endpoint** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md) | The endpoint to configure.                                                |
| **value**    | [Int32](https://docs.microsoft.com/dotnet/api/system.int32) | The maximum number of output tokens.                                      |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured endpoint instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) Model\<T>(endpoint, value)

Sets the model name for the specified endpoint.

| Parameter    | Type                                                          | Description                                                               |
| ------------ | ------------------------------------------------------------- | ------------------------------------------------------------------------- |
| **T**        |                                                               | A type derived from [SmartEndpoint](/ai/components/api/smartendpoint.md). |
| **endpoint** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)   | The endpoint to configure.                                                |
| **value**    | [String](https://docs.microsoft.com/dotnet/api/system.string) | The model name to assign.                                                 |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured endpoint instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) Name\<T>(endpoint, value)

Sets the name for the specified endpoint.

| Parameter    | Type                                                          | Description                                                               |
| ------------ | ------------------------------------------------------------- | ------------------------------------------------------------------------- |
| **T**        |                                                               | A type derived from [SmartEndpoint](/ai/components/api/smartendpoint.md). |
| **endpoint** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)   | The endpoint to configure.                                                |
| **value**    | [String](https://docs.microsoft.com/dotnet/api/system.string) | The name to assign.                                                       |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured endpoint instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) OnAfterInvokeTool\<T>(object, action)

Subscribes to the AfterInvokeTool event on the specified object.

| Parameter  | Type                                                                                  | Description                                                                    |
| ---------- | ------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------ |
| **T**      |                                                                                       | A type derived from [SmartObject](/ai/components/api/wisej.ai.smartobject.md). |
| **object** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)                           | The [SmartObject](/ai/components/api/wisej.ai.smartobject.md) to subscribe to. |
| **action** | [Action\<InvokeToolEventArgs>](https://docs.microsoft.com/dotnet/api/system.action-1) | The action to invoke when the event is raised.                                 |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) OnAfterResponseReceived\<T>(object, action)

Subscribes to the AfterResponseReceived event on the specified object.

| Parameter  | Type                                                                                | Description                                                                    |
| ---------- | ----------------------------------------------------------------------------------- | ------------------------------------------------------------------------------ |
| **T**      |                                                                                     | A type derived from [SmartObject](/ai/components/api/wisej.ai.smartobject.md). |
| **object** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)                         | The [SmartObject](/ai/components/api/wisej.ai.smartobject.md) to subscribe to. |
| **action** | [Action\<MessagesEventArgs>](https://docs.microsoft.com/dotnet/api/system.action-1) | The action to invoke when the event is raised.                                 |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) OnBeforeInvokeTool\<T>(object, action)

Subscribes to the BeforeInvokeTool event on the specified object.

| Parameter  | Type                                                                                  | Description                                                                    |
| ---------- | ------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------ |
| **T**      |                                                                                       | A type derived from [SmartObject](/ai/components/api/wisej.ai.smartobject.md). |
| **object** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)                           | The [SmartObject](/ai/components/api/wisej.ai.smartobject.md) to subscribe to. |
| **action** | [Action\<InvokeToolEventArgs>](https://docs.microsoft.com/dotnet/api/system.action-1) | The action to invoke when the event is raised.                                 |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) OnBeforeSendRequest\<T>(object, action)

Subscribes to the BeforeSendRequest event on the specified object.

| Parameter  | Type                                                                                | Description                                                                    |
| ---------- | ----------------------------------------------------------------------------------- | ------------------------------------------------------------------------------ |
| **T**      |                                                                                     | A type derived from [SmartObject](/ai/components/api/wisej.ai.smartobject.md). |
| **object** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)                         | The [SmartObject](/ai/components/api/wisej.ai.smartobject.md) to subscribe to. |
| **action** | [Action\<MessagesEventArgs>](https://docs.microsoft.com/dotnet/api/system.action-1) | The action to invoke when the event is raised.                                 |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) OnConvertParameter\<T>(object, action)

Subscribes to the ConvertParameter event on the specified object.

| Parameter  | Type                                                                                        | Description                                                                    |
| ---------- | ------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------ |
| **T**      |                                                                                             | A type derived from [SmartObject](/ai/components/api/wisej.ai.smartobject.md). |
| **object** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)                                 | The [SmartObject](/ai/components/api/wisej.ai.smartobject.md) to subscribe to. |
| **action** | [Action\<ConvertParameterEventArgs>](https://docs.microsoft.com/dotnet/api/system.action-1) | The action to invoke when the event is raised.                                 |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) OnDone\<T>(object, action)

Subscribes to the Done event on the specified object.

| Parameter  | Type                                                          | Description                                                                    |
| ---------- | ------------------------------------------------------------- | ------------------------------------------------------------------------------ |
| **T**      |                                                               | A type derived from [SmartObject](/ai/components/api/wisej.ai.smartobject.md). |
| **object** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)   | The [SmartObject](/ai/components/api/wisej.ai.smartobject.md) to subscribe to. |
| **action** | [Action](https://docs.microsoft.com/dotnet/api/system.action) | The action to invoke when the event is raised.                                 |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) OnError\<T>(object, action)

Subscribes to the Error event on the specified object.

| Parameter  | Type                                                                             | Description                                                                    |
| ---------- | -------------------------------------------------------------------------------- | ------------------------------------------------------------------------------ |
| **T**      |                                                                                  | A type derived from [SmartObject](/ai/components/api/wisej.ai.smartobject.md). |
| **object** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)                      | The [SmartObject](/ai/components/api/wisej.ai.smartobject.md) to subscribe to. |
| **action** | [Action\<ErrorEventArgs>](https://docs.microsoft.com/dotnet/api/system.action-1) | The action to invoke when the event is raised.                                 |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) OnPrepareMessages\<T>(object, action)

Subscribes to the PrepareMessage event on the specified object.

| Parameter  | Type                                                                                | Description                                                                    |
| ---------- | ----------------------------------------------------------------------------------- | ------------------------------------------------------------------------------ |
| **T**      |                                                                                     | A type derived from [SmartObject](/ai/components/api/wisej.ai.smartobject.md). |
| **object** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)                         | The [SmartObject](/ai/components/api/wisej.ai.smartobject.md) to subscribe to. |
| **action** | [Action\<MessagesEventArgs>](https://docs.microsoft.com/dotnet/api/system.action-1) | The action to invoke when the event is raised, receiving the event arguments.  |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) OnStart\<T>(object, action)

Subscribes to the Start event on the specified object.

| Parameter  | Type                                                          | Description                                                                    |
| ---------- | ------------------------------------------------------------- | ------------------------------------------------------------------------------ |
| **T**      |                                                               | A type derived from [SmartObject](/ai/components/api/wisej.ai.smartobject.md). |
| **object** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)   | The [SmartObject](/ai/components/api/wisej.ai.smartobject.md) to subscribe to. |
| **action** | [Action](https://docs.microsoft.com/dotnet/api/system.action) | The action to invoke when the event is raised.                                 |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) RetryDelay\<T>(endpoint, value)

Sets the retry delay (in milliseconds) for the specified HTTP endpoint.

| Parameter    | Type                                                        | Description                                                                                                        |
| ------------ | ----------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------ |
| **T**        |                                                             | A type derived from [SmartHttpEndpoint](/ai/components/api/smartendpoint/wisej.ai.endpoints.smarthttpendpoint.md). |
| **endpoint** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md) | The HTTP endpoint to configure.                                                                                    |
| **value**    | [Int32](https://docs.microsoft.com/dotnet/api/system.int32) | The retry delay in milliseconds.                                                                                   |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured HTTP endpoint instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) SystemPrompt\<T>(endpoint, value)

Sets the system prompt for the specified endpoint.

| Parameter    | Type                                                          | Description                                                               |
| ------------ | ------------------------------------------------------------- | ------------------------------------------------------------------------- |
| **T**        |                                                               | A type derived from [SmartEndpoint](/ai/components/api/smartendpoint.md). |
| **endpoint** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)   | The endpoint to configure.                                                |
| **value**    | [String](https://docs.microsoft.com/dotnet/api/system.string) | The system prompt text.                                                   |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured endpoint instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) Text\<T>(prompt, value)

Sets the Text for the specified SmartPrompt.

| Parameter  | Type                                                          | Description                                                           |
| ---------- | ------------------------------------------------------------- | --------------------------------------------------------------------- |
| **T**      |                                                               | A type derived from [SmartPrompt](/ai/components/api/smartprompt.md). |
| **prompt** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)   | The SmartPrompt to configure.                                         |
| **value**  | [String](https://docs.microsoft.com/dotnet/api/system.string) | The text string.                                                      |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured SmartPrompt instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) URL\<T>(endpoint, value)

Sets the URL for the specified HTTP endpoint.

| Parameter    | Type                                                          | Description                                                                                                        |
| ------------ | ------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------ |
| **T**        |                                                               | A type derived from [SmartHttpEndpoint](/ai/components/api/smartendpoint/wisej.ai.endpoints.smarthttpendpoint.md). |
| **endpoint** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)   | The HTTP endpoint to configure.                                                                                    |
| **value**    | [String](https://docs.microsoft.com/dotnet/api/system.string) | The URL to assign.                                                                                                 |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured HTTP endpoint instance.

### ![](/files/6srAlWaUVvAWWpvmGKFp) UseNativeTools\<T>(endpoint, value)

Specifies whether to use native tools for the specified endpoint.

| Parameter    | Type                                                            | Description                                                               |
| ------------ | --------------------------------------------------------------- | ------------------------------------------------------------------------- |
| **T**        |                                                                 | A type derived from [SmartEndpoint](/ai/components/api/smartendpoint.md). |
| **endpoint** | [T](/ai/components/api/markup/wisej.ai.markupextensions.md)     | The endpoint to configure.                                                |
| **value**    | [Boolean](https://docs.microsoft.com/dotnet/api/system.boolean) | True to use native tools; otherwise, false.                               |

**Returns:** [T](/ai/components/api/markup/wisej.ai.markupextensions.md). The configured endpoint instance.


---

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