implement a query visitor in csharp

main.cs
public interface IQueryVisitor
{
    void Visit(SqlQuery query);
    void Visit(LinqQuery query);
}
100 chars
6 lines

main.cs
public abstract class Query
{
    public abstract void Accept(IQueryVisitor visitor);
}
88 chars
5 lines

main.cs
public class SqlQuery : Query
{
    public override void Accept(IQueryVisitor visitor)
    {
        visitor.Visit(this);
    }
}

public class LinqQuery : Query
{
    public override void Accept(IQueryVisitor visitor)
    {
        visitor.Visit(this);
    }
}
262 chars
16 lines

main.cs
public class QueryVisitor : IQueryVisitor
{
    public void Visit(SqlQuery query)
    {
        // Handle SqlQuery here
    }

    public void Visit(LinqQuery query)
    {
        // Handle LinqQuery here
    }
}
213 chars
13 lines

main.cs
var queries = new List<Query> { new SqlQuery(), new LinqQuery() };

var visitor = new QueryVisitor();

foreach (var query in queries)
{
    query.Accept(visitor);
}
165 chars
9 lines