# ChatSession
Namespace: LLama
The main chat session class.
```csharp
public class ChatSession
```
Inheritance [Object](https://docs.microsoft.com/en-us/dotnet/api/system.object) → [ChatSession](./llama.chatsession.md)
## Fields
### **OutputTransform**
The output transform used in this session.
```csharp
public ITextStreamTransform OutputTransform;
```
## Properties
### **Executor**
The executor for this session.
```csharp
public ILLamaExecutor Executor { get; }
```
#### Property Value
[ILLamaExecutor](./llama.abstractions.illamaexecutor.md)
### **History**
The chat history for this session.
```csharp
public ChatHistory History { get; }
```
#### Property Value
[ChatHistory](./llama.common.chathistory.md)
### **HistoryTransform**
The history transform used in this session.
```csharp
public IHistoryTransform HistoryTransform { get; set; }
```
#### Property Value
[IHistoryTransform](./llama.abstractions.ihistorytransform.md)
### **InputTransformPipeline**
The input transform pipeline used in this session.
```csharp
public List InputTransformPipeline { get; set; }
```
#### Property Value
[List<ITextTransform>](https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.list-1)
## Constructors
### **ChatSession(ILLamaExecutor)**
```csharp
public ChatSession(ILLamaExecutor executor)
```
#### Parameters
`executor` [ILLamaExecutor](./llama.abstractions.illamaexecutor.md)
The executor for this session
## Methods
### **WithHistoryTransform(IHistoryTransform)**
Use a custom history transform.
```csharp
public ChatSession WithHistoryTransform(IHistoryTransform transform)
```
#### Parameters
`transform` [IHistoryTransform](./llama.abstractions.ihistorytransform.md)
#### Returns
[ChatSession](./llama.chatsession.md)
### **AddInputTransform(ITextTransform)**
Add a text transform to the input transform pipeline.
```csharp
public ChatSession AddInputTransform(ITextTransform transform)
```
#### Parameters
`transform` [ITextTransform](./llama.abstractions.itexttransform.md)
#### Returns
[ChatSession](./llama.chatsession.md)
### **WithOutputTransform(ITextStreamTransform)**
Use a custom output transform.
```csharp
public ChatSession WithOutputTransform(ITextStreamTransform transform)
```
#### Parameters
`transform` [ITextStreamTransform](./llama.abstractions.itextstreamtransform.md)
#### Returns
[ChatSession](./llama.chatsession.md)
### **SaveSession(String)**
```csharp
public void SaveSession(string path)
```
#### Parameters
`path` [String](https://docs.microsoft.com/en-us/dotnet/api/system.string)
The directory name to save the session. If the directory does not exist, a new directory will be created.
### **LoadSession(String)**
```csharp
public void LoadSession(string path)
```
#### Parameters
`path` [String](https://docs.microsoft.com/en-us/dotnet/api/system.string)
The directory name to load the session.
### **Chat(ChatHistory, IInferenceParams, CancellationToken)**
Get the response from the LLama model with chat histories.
```csharp
public IEnumerable Chat(ChatHistory history, IInferenceParams inferenceParams, CancellationToken cancellationToken)
```
#### Parameters
`history` [ChatHistory](./llama.common.chathistory.md)
`inferenceParams` [IInferenceParams](./llama.abstractions.iinferenceparams.md)
`cancellationToken` [CancellationToken](https://docs.microsoft.com/en-us/dotnet/api/system.threading.cancellationtoken)
#### Returns
[IEnumerable<String>](https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.ienumerable-1)
### **Chat(String, IInferenceParams, CancellationToken)**
Get the response from the LLama model. Note that prompt could not only be the preset words,
but also the question you want to ask.
```csharp
public IEnumerable Chat(string prompt, IInferenceParams inferenceParams, CancellationToken cancellationToken)
```
#### Parameters
`prompt` [String](https://docs.microsoft.com/en-us/dotnet/api/system.string)
`inferenceParams` [IInferenceParams](./llama.abstractions.iinferenceparams.md)
`cancellationToken` [CancellationToken](https://docs.microsoft.com/en-us/dotnet/api/system.threading.cancellationtoken)
#### Returns
[IEnumerable<String>](https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.ienumerable-1)
### **ChatAsync(ChatHistory, IInferenceParams, CancellationToken)**
Get the response from the LLama model with chat histories.
```csharp
public IAsyncEnumerable ChatAsync(ChatHistory history, IInferenceParams inferenceParams, CancellationToken cancellationToken)
```
#### Parameters
`history` [ChatHistory](./llama.common.chathistory.md)
`inferenceParams` [IInferenceParams](./llama.abstractions.iinferenceparams.md)
`cancellationToken` [CancellationToken](https://docs.microsoft.com/en-us/dotnet/api/system.threading.cancellationtoken)
#### Returns
[IAsyncEnumerable<String>](https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.iasyncenumerable-1)
### **ChatAsync(String, IInferenceParams, CancellationToken)**
Get the response from the LLama model with chat histories asynchronously.
```csharp
public IAsyncEnumerable ChatAsync(string prompt, IInferenceParams inferenceParams, CancellationToken cancellationToken)
```
#### Parameters
`prompt` [String](https://docs.microsoft.com/en-us/dotnet/api/system.string)
`inferenceParams` [IInferenceParams](./llama.abstractions.iinferenceparams.md)
`cancellationToken` [CancellationToken](https://docs.microsoft.com/en-us/dotnet/api/system.threading.cancellationtoken)
#### Returns
[IAsyncEnumerable<String>](https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.iasyncenumerable-1)