Is it possible to attach methods to C# anonymous types?

It would be desirable to be able to provide e.g. comparison functions (i.e. with lambdas) for an ano开发者_如何学Pythonnymous type, so that they can be sorted by a set of criteria. Is that possible in C#?

No, just make a regular class instead.

Possible related: Can a C# anonymous class implements an interface?

Lambdas are implicitly convertable to System.Comparison`1:

var anons = (new[] {new {a = 3}, new {a = 4}, new {a = 2}}).ToList();
anons.Sort((x, y) => (x.a - y.a));

You can also use the LINQ OrderBy extension method to sort anonymous types.

var anons = new[] {new {a = 3}, new {a = 4}, new {a = 2}};
var sorted = anons.OrderBy(s => s.a);

Yes. You must declare the type of the comparison function:

var anon = new {comparator = (Func<string, int>) (s => s.Length)};