//Computes the value and puts the result to property.
public void Assign(string key, string expression)
{
string name = key.Substring(0, key.LastIndexOf(PROPERTY_CHAR));
string prop = key.Substring(key.LastIndexOf(PROPERTY_CHAR) + 1);
IVariable var = base.Variable(name);
try
{
System.Reflection.PropertyInfo propertyInfo = var.GetType().GetProperty(prop);
Type type = propertyInfo.PropertyType;
object calcValue = this.Compute(expression, var);
if (object.ReferenceEquals(type, typeof(float)))
{
calcValue = Convert.ToSingle(calcValue);
}
else if (object.ReferenceEquals(type, typeof(int)))
{
calcValue = Convert.ToInt32(calcValue);
}
else if (!object.ReferenceEquals(type, typeof(string)) && calcValue is string)
{
calcValue = Convert.ToString(calcValue);
}
var.GetType().InvokeMember(prop, System.Reflection.BindingFlags.SetProperty, null, var, new object[] {calcValue});
}
catch (Exception ex)
{
//Collection exceptions.
if (ex is ExpressionException)
{
m_exceptions.AddException((ExpressionException)ex);
}
else if (ex is MissingMemberException)
{
//Incompatible datatype between property and expression.
ExpressionException expressionException = new ExpressionException("Expression result is not compatible with property", 0, expression.Length);
Expression exp = new Expression();
exp.SetExpression(key, expression, this);
expressionException.Expression = exp;
m_exceptions.AddException(expressionException);
}
}
}
//Add a new expression.
public void AddExpression(string key, string expression)
{
Expression expr = new Expression();
expr.SetExpression(key, expression, this);
this.m_expressions.Add(key, expr);
}