public DynamicFilterExpression(IFilterMessages filter)
{
Verify.NotNull(filter, "filter");
staticFilter = filter;
systemEvent = Expression.Parameter(typeof(SystemEvent), "e");
filterParameters = new FilterParameters {
systemEvent
};
}
protected override Expression BuildExpression(FilterParameters parameters)
{
var systemEvent = parameters.GetParameter(typeof(SystemEvent));
var propertyName = ExtendedProperties.GetExtendedProperty("property");
var propertyExpression = Expression.Property(systemEvent, propertyName);
return(expressionBuilder.Invoke(
ConvertPropertyValueIfRequired(propertyExpression),
GetConvertedValue(propertyExpression.Type)
));
}
protected override Expression BuildExpression(FilterParameters parameters)
{
var filters = Children.ToList();
switch (filters.Count)
{
case 0:
return(Expression.Constant(true));
case 1:
return(filters[0].CreateExpression(parameters));
default:
var expression = filters[0].CreateExpression(parameters);
for (var i = 1; i < filters.Count; i++)
{
expression = expressionBuilder.Invoke(expression, filters[i].CreateExpression(parameters));
}
return(expression);
}
}
protected abstract Expression BuildExpression(FilterParameters parameters);
public Expression CreateExpression(FilterParameters parameters)
{
Verify.NotNull(parameters, "parameters");
return(BuildExpression(parameters));
}
protected override Expression BuildExpression(FilterParameters parameters)
{
return(Expression.Not(base.BuildExpression(parameters)));
}
