static void Main(string[] args)
{
var list = new Person[]
{
new Person()
{
Name = "code6421", Age = 12
},
new Person()
{
Name = "mary", Age = 16
},
new Person()
{
Name = "ark", Age = 12
},
new Person()
{
Name = "jerry", Age = 14
},
};
var expr = ExpressionHelper <Person> .Create(a => a.Name == "code6421");
expr = ExpressionHelper <Person> .And(expr, a => a.Age == 12);
foreach (var item in list.AsQueryable().Where(expr))
{
Console.WriteLine(item.Name);
}
Console.ReadLine();
}
public Expression <Func <PostLike, bool> > GetExpressionToFilter(PostLikeQuery query)
{
Expression <Func <PostLike, bool> > expression = null;
if (query.PostId.HasValue)
{
expression = x => x.PostId == query.PostId;
}
if (!string.IsNullOrEmpty(query.IpAddress))
{
expression = ExpressionHelper.And <PostLike>(expression, x => x.IPAddress == query.IpAddress);
}
return(expression);
}
public QueryEngine.Expressions.Expression Expression()
{
Expression[] _expressions = new Expression[DBFilters.Count];
for (int i = 0; i < DBFilters.Count; i++)
{
_expressions[i] = DBFilters[i].Expression();
}
switch (LogicalOperator)
{
case DBLogicalOperator.And:
return(ExpressionHelper.And(_expressions));
default:
case DBLogicalOperator.Or:
return(ExpressionHelper.Or(_expressions));
}
}