---
id: "M:cAlgo.API.File.AppendAllLines(System.String[])"
kind: "method"
type: "T:cAlgo.API.File"
url: "https://help.ctrader.com/ctrader-algo/references/Utility/File/AppendAllLines/"
---

> Documentation index for agents: https://help.ctrader.com/ctrader-algo/llms.txt · machine index: https://help.ctrader.com/ctrader-algo/api.json

# File.AppendAllLines

Member of [File](https://help.ctrader.com/ctrader-algo/references/Utility/File/index.md).

## AppendAllLines(string[] contents)

Appends lines to file.

Environments: Desktop supported · CLI supported · Cloud not supported.

- Cloud: Exists returns false; reads return empty string/array; writes and appends silently do nothing. No exception.

C#:

```csharp
void AppendAllLines(string[] contents)
```

Python:

```python
file.AppendAllLines(contents: list[str]) -> None
```

### Parameters

- `contents` (`string[]`, Python `list[str]`): The string lines to append to the file.

Available since cAlgo.API 5.7.

### Examples

C#:

```csharp
protected override void OnStart()
{
    var lines = Positions.Select(position => $"{position.SymbolName},{position.TradeType},{position.NetProfit}").ToArray();
    DataFile.AppendAllLines(lines);
}
```

Python:

```python
from System import Array, String

lines = [f"{position.SymbolName},{position.TradeType},{position.NetProfit}" for position in api.Positions]
api.DataFile.AppendAllLines(Array[String](lines))
```

config.json:

```json
{
  "Parameters": [
    {
      "Name": "DataFile",
      "DisplayName": "Data File",
      "Type": "File"
    }
  ]
}
```

## AppendAllLines(string[] contents, EncodingType encodingType)

Appends lines to file that has a specified encoding.

Environments: Desktop supported · CLI supported · Cloud not supported.

- Cloud: Exists returns false; reads return empty string/array; writes and appends silently do nothing. No exception.

C#:

```csharp
void AppendAllLines(string[] contents, EncodingType encodingType)
```

Python:

```python
file.AppendAllLines(contents: list[str], encodingType: EncodingType) -> None
```

### Parameters

- `contents` (`string[]`, Python `list[str]`): The string lines to append to the file.
- `encodingType` (`EncodingType`, Python `EncodingType`): Encoding type

Available since cAlgo.API 5.7.

### Examples

C#:

```csharp
protected override void OnStart()
{
    DataFile.AppendAllLines(new[] { SymbolName, Symbol.Bid.ToString() }, EncodingType.Utf32);
}
```

Python:

```python
from System import Array, String

api.DataFile.AppendAllLines(Array[String]([api.SymbolName, str(api.Symbol.Bid)]), EncodingType.Utf32)
```

config.json:

```json
{
  "Parameters": [
    {
      "Name": "DataFile",
      "DisplayName": "Data File",
      "Type": "File"
    }
  ]
}
```