public Task <object?> EvaluateAsync(string expression, Type returnType, ActivityExecutionContext context, CancellationToken cancellationToken)
{
var matches = rx.Matches(expression);
foreach (Match match in matches)
{
var variable = match.Groups[1].Value;
string replacement = match.Groups[0].Value;
switch (variable)
{
case "correlationId":
replacement = $"'{context.WorkflowExecutionContext.CorrelationId}'";
break;
case "workflowDefinitionId":
replacement = $"'{context.WorkflowInstance.DefinitionId}'";
break;
case "workflowDefinitionVersion":
replacement = $"{context.WorkflowInstance.DefinitionVersionId}";
break;
case "workflowInstanceId":
replacement = $"'{context.WorkflowInstance.Id}'";
break;
default:
if (context.HasVariable(variable))
{
var value = context.GetVariable(variable);
if (value is not null)
{
replacement = IsNumber(value)? $"{value}" : $"'{value}'";
}
else
{
replacement = "NULL";
}
}
break;
}
expression = expression.Replace(match.Groups[0].Value, replacement);
}
return(Task.FromResult(expression.Parse(returnType)));
}
public static bool HasFromNumber(this ActivityExecutionContext context) => context.HasVariable(FromNumberVariableName);
public static bool HasCallControlId(this ActivityExecutionContext context) => context.HasVariable(CallControlIdVariableName);