/// <summary>
/// Evaluate the specified expression, for the given element and model.
/// </summary>
/// <param name="expression">The expression to evaluate.</param>
/// <param name="context">The rendering context for the expression being evaluated.</param>
/// <param name="model">The ZPT model, providing the context for evaluation.</param>
public override ExpressionResult Evaluate(Expression expression, IRenderingContext context, ITalesModel model)
{
object result;
try
{
result = _host.Evaluate(expression.Content, model.GetAllDefinitions());
}
catch(Exception ex)
{
string message = String.Format(Resources.ExceptionMessages.EvaluationFailureFormat, expression.Content);
throw new ModelEvaluationException(message, ex);
}
return new ExpressionResult(result);
}
/// <summary>
/// Evaluate the specified expression, for the given element and model.
/// </summary>
/// <param name="expression">The expression to evaluate.</param>
/// <param name="context">The rendering context for the expression being evaluated.</param>
/// <param name="model">The ZPT model, providing the context for evaluation.</param>
public override ExpressionResult Evaluate(Expression expression, IRenderingContext context, ITalesModel model)
{
if(expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
if(context == null)
{
throw new ArgumentNullException(nameof(context));
}
if(model == null)
{
throw new ArgumentNullException(nameof(model));
}
var expressionText = expression.Content;
var allDefinitions = model.GetAllDefinitions();
var csharpExpression = _expressionService.GetExpression(expressionText, allDefinitions.Keys);
return new ExpressionResult(csharpExpression.Evaluate(allDefinitions));
}
