# Interface ITransitionExpressionBuilder

OptimaJet.Workflow.Core.Model.Builder.ITransitionExpressionBuilder

Defines fluent operations for configuring a [ConditionType.Expression](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ConditionType/) condition in [TransitionDefinition.Conditions](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/TransitionDefinition/).

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

```csharp
public interface ITransitionExpressionBuilder : ITransitionConditionsBuilder, ITransitionBuilder, IProcessDefinitionBuilder
```

## Type Hierarchy

-   ITransitionExpressionBuilder Current type
    -   Base interfaces
        -   [ITransitionConditionsBuilder](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model.Builder/ITransitionConditionsBuilder/)
            -   [ITransitionBuilder](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model.Builder/ITransitionBuilder/)
                -   [IProcessDefinitionBuilder](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model.Builder/IProcessDefinitionBuilder/)

## Methods

`ITransitionExpressionBuilder Inverted()` 

Sets [ConditionDefinition.ConditionInversion](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ConditionDefinition/) to [true](https://learn.microsoft.com/dotnet/csharp/language-reference/builtin-types/bool) for the current [ConditionDefinition](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ConditionDefinition/), causing the result of normal evaluation to be negated.

### Returns

| Type | Description |
| --- | --- |
| `ITransitionExpressionBuilder` | The same [ITransitionExpressionBuilder](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model.Builder/ITransitionExpressionBuilder/) instance for method chaining. |

`ITransitionExpressionBuilder NotInverted()` 

Sets [ConditionDefinition.ConditionInversion](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ConditionDefinition/) to [false](https://learn.microsoft.com/dotnet/csharp/language-reference/builtin-types/bool) for the current [ConditionDefinition](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ConditionDefinition/), causing the result of normal evaluation to be used without negation.

### Returns

| Type | Description |
| --- | --- |
| `ITransitionExpressionBuilder` | The same [ITransitionExpressionBuilder](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model.Builder/ITransitionExpressionBuilder/) instance for method chaining. |

`ITransitionExpressionBuilder ReturnTrueOnPreExecution()` 

Sets [ConditionDefinition.ResultOnPreExecution](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ConditionDefinition/) to [true](https://learn.microsoft.com/dotnet/csharp/language-reference/builtin-types/bool). During pre-execution simulation, this fixed result is used without evaluating [ConditionDefinition.Expression](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ConditionDefinition/).

### Returns

| Type | Description |
| --- | --- |
| `ITransitionExpressionBuilder` | The same [ITransitionExpressionBuilder](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model.Builder/ITransitionExpressionBuilder/) instance for method chaining. |

`ITransitionExpressionBuilder ReturnFalseOnPreExecution()` 

Sets [ConditionDefinition.ResultOnPreExecution](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ConditionDefinition/) to [false](https://learn.microsoft.com/dotnet/csharp/language-reference/builtin-types/bool). During pre-execution simulation, this fixed result is used without evaluating [ConditionDefinition.Expression](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ConditionDefinition/).

### Returns

| Type | Description |
| --- | --- |
| `ITransitionExpressionBuilder` | The same [ITransitionExpressionBuilder](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model.Builder/ITransitionExpressionBuilder/) instance for method chaining. |

`ITransitionExpressionBuilder CalculateOnPreExecution()` 

Sets [ConditionDefinition.ResultOnPreExecution](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ConditionDefinition/) to [null](https://learn.microsoft.com/dotnet/csharp/language-reference/keywords/null), causing [ConditionDefinition.Expression](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ConditionDefinition/) to be evaluated normally during pre-execution simulation.

### Returns

| Type | Description |
| --- | --- |
| `ITransitionExpressionBuilder` | The same [ITransitionExpressionBuilder](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model.Builder/ITransitionExpressionBuilder/) instance for method chaining. |

[Previous ITransitionConditionsBuilder](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model.Builder/ITransitionConditionsBuilder/) [Next ITransitionParallelFinalizeBuilder](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model.Builder/ITransitionParallelFinalizeBuilder/)