# Class AggregatingDesignerParameterFormatProvider

OptimaJet.Workflow.Core.Runtime.AggregatingDesignerParameterFormatProvider

Combines registered [IDesignerParameterFormatProvider](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime/IDesignerParameterFormatProvider/) implementations into one provider and selects a single structured parameter format by registration priority.

Namespace: [OptimaJet.Workflow.Core.Runtime](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime/)

```csharp
public class AggregatingDesignerParameterFormatProvider : BaseAggregatingProvider<IDesignerParameterFormatProvider>, IDesignerParameterFormatProvider
```

## Type Hierarchy

-   [BaseAggregatingProvider<IDesignerParameterFormatProvider>](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime/BaseAggregatingProvider-T/)
    -   AggregatingDesignerParameterFormatProvider Current type
        -   Implemented interfaces
            -   [IDesignerParameterFormatProvider](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime/IDesignerParameterFormatProvider/)

## Methods

`public List<CodeActionParameterDefinition> GetFormat(CodeActionType type, string name, string schemeCode)` 

Gets the ordered form-field definitions for a named action, condition, or rule.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `type` | `CodeActionType` | The parameter usage context: [CodeActionType.Action](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/CodeActionType/), [CodeActionType.Condition](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/CodeActionType/), [CodeActionType.RuleCheck](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/CodeActionType/), or [CodeActionType.RuleGet](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/CodeActionType/). |
| `name` | `String` | The action, condition, or rule name selected in the Designer. |
| `schemeCode` | `String` | The current process scheme code, which can be used to provide scheme-specific fields. The value may be [null](https://learn.microsoft.com/dotnet/csharp/language-reference/keywords/null) when the format is requested without a process scheme context. |

### Returns

| Type | Description |
| --- | --- |
| `List<CodeActionParameterDefinition>` | An ordered list containing one [CodeActionParameterDefinition](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/CodeActionParameterDefinition/) per form field. Returning [null](https://learn.microsoft.com/dotnet/csharp/language-reference/keywords/null) or an empty list indicates that no structured parameter editor is defined; the Designer then uses its raw JSON editor. |

### Remarks

The same `type`, `name`, and `schemeCode` values are passed to each provider until one returns a non-empty list.

## Remarks

For a scheme, both global providers and providers registered specifically for that scheme are applicable. Providers are queried from the most recently registered to the earliest, regardless of registration scope. A [null](https://learn.microsoft.com/dotnet/csharp/language-reference/keywords/null) or empty result means that a provider has no format for the request, so resolution continues with the next provider. The first non-empty result is returned unchanged; formats from different providers are never combined.

[Previous AggregatingDesignerAutocompleteProvider](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime/AggregatingDesignerAutocompleteProvider/) [Next AggregatingExternalParametersProvider](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime/AggregatingExternalParametersProvider/)