---
id: "T:cAlgo.API.OptimizationMultiSymbolParameter"
kind: "record"
namespace: "cAlgo.API"
url: "https://help.ctrader.com/ctrader-algo/references/Plugin/Optimization/OptimizationMultiSymbolParameter/"
---

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

# OptimizationMultiSymbolParameter (record)

A `Symbol[]` (multi-symbol) cBot parameter. Not optimizable; always held fixed.

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

- CLI: Available to plugins only, and plugins cannot run in the CLI.
- Cloud: Available to plugins only, and plugins cannot run in the cloud.

## Definition

```csharp
public class OptimizationMultiSymbolParameter : OptimizationParameter`1
```

Available since cAlgo.API 5.9.

## Examples

C#:

```csharp
var parameter = new OptimizationMultiSymbolParameter("Basket", Symbols.GetSymbols("EURUSD", "GBPUSD", "USDJPY"));
Print("{0} holds {1} symbols", parameter.Name, parameter.Value.Count);
```

Python:

```python
parameter = OptimizationMultiSymbolParameter("Basket", api.Symbols.GetSymbols("EURUSD", "GBPUSD", "USDJPY"))
api.Print(f"{parameter.Name} holds {parameter.Value.Count} symbols")
```

## Constructors

- `public OptimizationMultiSymbolParameter(string name, IReadOnlyList<Symbol> value)` — Holds the parameter fixed at the given value. [details](https://help.ctrader.com/ctrader-algo/references/Plugin/Optimization/OptimizationMultiSymbolParameter/Constructor/index.md)
- `public OptimizationMultiSymbolParameter(OptimizationMultiSymbolParameter original)` —  [details](https://help.ctrader.com/ctrader-algo/references/Plugin/Optimization/OptimizationMultiSymbolParameter/Constructor/index.md)

## Inherited members

- `public string Name {get;}` (from OptimizationParameter) [details](https://help.ctrader.com/ctrader-algo/references/Plugin/Optimization/OptimizationParameter/Name/index.md)
- `public bool IsOptimized {get;}` (from OptimizationParameter) [details](https://help.ctrader.com/ctrader-algo/references/Plugin/Optimization/OptimizationParameter/IsOptimized/index.md)