I had a bit of spare time on my hands and a laptop with visual studio 2008 installed, so I thought I would play a bit with linq.
The code below just returns the first line from the address object that matches a criteria,
From the simple example below you can see that nothing much has changed from 2.0 anonymous delegates to the 3.5 linq queries, personally I'm not sure which I like better, the 2.0 anonymous delegate has a simplicity to it that I quite like.
The 3.5 version , especially the second way is much clearer what it is doing.
I use the anonymous delegate a lot when coding in 2.0.
Dave.
class Program
{
static void Main(string[] args)
{
List<Address> addresses = new List<Address>();
addresses.Add(new Address("1 City Road", "", "London"));
addresses.Add(new Address("2 Bridge Avenue", "Chelsea", "London"));
addresses.Add(new Address("3 Champs Elysee", "", "Paris"));
//3.5 version
var result = from address in addresses.Cast<Address>() where address.City == "London" select address.Line1;
foreach(string s in result){
Console.WriteLine(s);
}
//Better way
var result2 = from Address address in addresses where address.City == "Paris" select address.Line1;
foreach (string v in result2)
{
Console.WriteLine("=== " + v);
}
//2.0 version.
IEnumerable<Address> resultList = addresses.FindAll(delegate(Address a) { return a.City == "London"; });
foreach (Address s in resultList)
{
Console.WriteLine("--- " + s.Line1);
}
Console.ReadKey();
}
}
class Address
{
string _Line1;
string _Line2;
string _City;
public string Line1 { get { return _Line1; } set { _Line1 = value; } }
public Address(string line1, string line2, string city)
{
this.City = city;
this.Line1 = line1;
this.Line2 = line2;
}
public string Line2 { get { return Line2;} set{ _Line2 = value;} }
public string City { get { return _City; } set { _City = value; } }
}
