public async Task<IActionResult> Demo(JsEvaluationViewModel editedModel)
{
var model = _jsEvaluationService.GetInitializationData();
await TryUpdateModelAsync(model, string.Empty, m => m.EngineName, m=> m.Expression);
if (ModelState.IsValid)
{
model = _jsEvaluationService.Evaluate(model);
ModelState.Clear();
}
return View(model);
}
public JsEvaluationViewModel GetInitializationData()
{
var model = new JsEvaluationViewModel
{
EngineName = _engineSwitcher.DefaultEngineName,
AvailableEngineList = _engineSwitcher.EngineFactories
.Select(e => new SelectListItem
{
Value = e.EngineName,
Text = GetEngineDisplayName(e.EngineName)
}),
Expression = string.Empty,
Result = null
};
return model;
}
public JsEvaluationViewModel Evaluate(JsEvaluationViewModel model)
{
IJsEngine engine = null;
var result = new JsEvaluationResultViewModel();
try
{
engine = _engineSwitcher.CreateEngine(model.EngineName);
result.Value = engine.Evaluate<string>(model.Expression);
}
catch (JsEngineLoadException e)
{
var error = GetJsEvaluationErrorFromException(e);
result.Errors.Add(error);
}
catch (JsRuntimeException e)
{
var error = GetJsEvaluationErrorFromException(e);
error.LineNumber = e.LineNumber;
error.ColumnNumber = e.ColumnNumber;
error.SourceFragment = e.SourceFragment;
result.Errors.Add(error);
}
finally
{
if (engine != null)
{
engine.Dispose();
}
}
model.Result = result;
return model;
}