/// <inheritdoc />
public override Expression <Func <Event, bool> > GetFilterExpression()
{
if (_specifications.Length == 0)
{
return(e => true);
}
Expression <Func <Event, bool> > result = _specifications[0].GetFilterExpression();
var parameterReplacer = new ParameterReplacer();
foreach (var specification in _specifications.Skip(1))
{
var filterExpression = specification.GetFilterExpression();
var parameter = Expression.Parameter(typeof(Event));
result = Expression.Lambda <Func <Event, bool> >(
Expression.OrElse(
parameterReplacer.ReplaceParameterWith(parameter, result.Body),
parameterReplacer.ReplaceParameterWith(parameter, filterExpression.Body)
),
parameter);
}
return(result);
}
/// <inheritdoc />
public override Expression <Func <Event, bool> > GetFilterExpression()
{
var parameterReplacer = new ParameterReplacer();
var filterExpression = _specification.GetFilterExpression();
var parameter = Expression.Parameter(typeof(Event));
var result = Expression.Lambda <Func <Event, bool> >(
Expression.Not(
parameterReplacer.ReplaceParameterWith(parameter, filterExpression.Body)
),
parameter);
return(result);
}