Sort Criteria for Generic.List ???

[Peter Olcott]

How does not specify the sort criteria for Generic.List ??
The way that this is done in C++ STL is to implement operator<(), how is this
done in C# and DotNet for Generic.List ???

 

[sloan]

Check
6/5/2006
Custom Objects and Tiered Development II // 2.0

http://sholliday.spaces.live.com/blog/

And find the
public class CustomerComparer : IComparer<BusinessObjects.Customer>
{
}

class.

 

[Dave Sexton]

Hi Peter,

You can sort a generic list easily using an anonymous method.

Take the following class for example:

class MyObject
{
// public for the sake of example
public string stringField;

public MyObject(string stringField)
{
this.stringField = stringField;
}
}

You can create a generic list of MyObjects as follows:

List<MyObject> list = new List<MyObject>();

// note: add the objects unsorted on stringField:
list.Add(new MyObject("string 2"));
list.Add(new MyObject("string 3"));
list.Add(new MyObject("string 1"));

Sort them by their stringField value:

list.Sort(
// anonymous method
delegate(MyObject mo1, MyObject mo2)
{
// Perform any comparison that you'd like here.
// In this example, we're just comparing stringFields
return mo1.stringField.CompareTo(mo2.stringField);
});

Result:

Debug.Assert(list[0].stringField == "string 1", "index 0 invalid");
Debug.Assert(list[1].stringField == "string 2", "index 1 invalid");
Debug.Assert(list[2].stringField == "string 3", "index 2 invalid");

 

[Robbe Morris [C# MVP]]

http://www.eggheadcafe.com/articles/dotnet_generics_class_property_sort.asp

--
Robbe Morris - 2004-2006 Microsoft MVP C#
I've mapped the database to .NET class properties and methods to
implement an multi-layered object oriented environment for your
data access layer. Thus, you should rarely ever have to type the words
SqlCommand, SqlDataAdapter, or SqlConnection again.
http://www.eggheadcafe.com/articles/adonet_source_code_generator.asp