# Class ExpressionCompilationRequest

OptimaJet.Workflow.Core.CodeActions.ExpressionCompilationRequest

Provides read-only copies of expression sources and the context needed to compile them.

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

```csharp
public sealed class ExpressionCompilationRequest
```

## Properties

`public IReadOnlyList<ExpressionSource> Sources { get; }` 

Gets the original sources in evaluation order. Requests other than transition conditions contain one source.

`public ConcatenationType? ConditionsConcatenationType { get; }` 

Gets the transition condition operator, or null for other expressions.

`public string PreparedExpression { get; }` 

Gets the prepared C# body, without an asynchronous lambda wrapper.

### Remarks

Prepared on first access so a compiler can reject a source before C# transformation.

`public Type ResultType { get; }` 

Gets the result type requested by the caller.

`public ExpressionCompilationPurpose Purpose { get; }` 

Gets the workflow feature requesting compilation.

`public string SchemeCode { get; }` 

Gets the scheme code, or null when no scheme context is available.

`public Guid? SchemeId { get; }` 

Gets the scheme ID, or null when no scheme context is available.

`public string SchemeTenantId { get; }` 

Gets the scheme tenant, or null if the scheme is shared or unknown. The process tenant can be different.

`public string SourceName { get; }` 

Gets the diagnostic name of the transition, timer, actor, or action and target parameter.

`public string FunctionName { get; }` 

Gets the function name used in error messages.

`public bool AllowLiteralFallback { get; }` 

Gets whether built-in compilation can fall back to a literal. External compilers decide whether to accept literals.

`public IReadOnlyList<Assembly> References { get; }` 

Gets additional assembly references, excluding implicit standard references supplied by the compiler.

`public IReadOnlyList<string> Imports { get; }` 

Gets the namespace imports captured for this compilation.

## Remarks

Sources, condition flags, and the concatenation operator describe the same expression as PreparedExpression. Scheme metadata helps identify errors; it does not grant access to data or code. The request contains no process values.

[Previous ExpressionCompilationPurpose](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/ExpressionCompilationPurpose/) [Next ExpressionManager](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/ExpressionManager/)