/// <summary>
/// Creates a context for a new lambda expression.
/// </summary>
/// <param name="item"></param>
/// <param name="parameters"></param>
/// <returns></returns>
OperationContext CreateLambdaContext(TSource item, params ParameterExpression[] parameters)
{
// generate new parameter
var ctx = new OperationContext(Context);
var var = OperationFactory.FromValue(item);
ctx.Variables[parameters[0].Name] = var;
return(ctx);
}
